2318 Number of Distinct Roll Sequences Hard 254 91.67 2317 Maximum XOR After Operations Medium 1 100.00 2316 Count Unreachable Pairs of Nodes in an Undirected Graph Medium 32 100.00 2315 Count Asterisks Easy 1 100.00 2312 Selling Pieces of Wood Hard Backtracking 78 63.64 2311 Longest Binary Subsequence Less Than or Equal to K Medium String, Dynamic_Programming, Greedy, Memoization 1 100.00 2310 Sum of Numbers With Units Digit K Medium Math 1 66.67 2309 Greatest English Letter in Upper and Lower Case Easy Array 5 75.00 2306 Naming a Company Hard Array, String, Hash_Table, Bit_Manipulation, Enumeration 486 74.14 2305 Fair Distribution of Cookies Medium Array, Dynamic_Programming, Bit_Manipulation, Backtracking, Bitmask 14 84.35 2304 Minimum Path Cost in a Grid Medium Array, Dynamic_Programming, Matrix 6 99.18 2303 Calculate Amount Paid in Taxes Easy Array, Simulation 1 92.41 2302 Count Subarrays With Score Less Than K Hard Array, Binary_Search, Prefix_Sum, Sliding_Window 4 88.77 2301 Match Substring After Replacement Hard Array, String, Hash_Table, String_Matching 205 94.20 2300 Successful Pairs of Spells and Potions Medium Array, Sorting, Binary_Search, Two_Pointers 85 71.70 2299 Strong Password Checker II Easy String 1 97.32 2296 Design a Text Editor Hard String, Stack, Design, Simulation, Linked_List, Doubly_Linked_List 238 87.02 2295 Replace Elements in an Array Medium Array, Hash_Table, Simulation 89 65.26 2294 Partition Array Such That Maximum Difference Is K Medium Array, Sorting, Greedy 35 94.09 2293 Min Max Game Easy Array, Simulation 1 90.39 2290 Minimum Obstacle Removal to Reach Corner Hard Array, Breadth_First_Search, Matrix, Heap_Priority_Queue, Graph, Shortest_Path 172 82.27 2289 Steps to Make Array Non-decreasing Medium Array, Stack, Linked_List, Monotonic_Stack 11 92.82 2288 Apply Discount to Prices Medium String 82 97.98 2287 Rearrange Characters to Make Target String Easy String, Hash_Table, Counting 1 87.39 2286 Booking Concert Tickets in Groups Hard Binary_Search, Design, Segment_Tree, Binary_Indexed_Tree 283 67.08 2285 Maximum Total Importance of Roads Medium Sorting, Greedy, Heap_Priority_Queue, Graph 54 41.07 2284 Sender With Largest Word Count Medium Array, String, Hash_Table, Counting 42 95.64 2283 Check if Number Has Equal Digit Count and Digit Value Easy String, Hash_Table, Counting 1 99.36 2281 Sum of Total Strength of Wizards Hard Array, Stack, Prefix_Sum, Monotonic_Stack 142 68.92 2280 Minimum Lines to Represent a Line Chart Medium Array, Math, Sorting, Geometry, Number_Theory 40 96.09 2279 Maximum Bags With Full Capacity of Rocks Medium Array, Sorting, Greedy 17 91.12 2278 Percentage of Letter in String Easy String 0 100.00 2276 Count Integers in Intervals Hard Design, Ordered_Set, Segment_Tree 137 64.87 2275 Largest Combination With Bitwise AND Greater Than Zero Medium Array, Hash_Table, Bit_Manipulation, Counting 19 96.92 2274 Maximum Consecutive Floors Without Special Floors Medium Array, Sorting 33 99.36 2273 Find Resultant Array After Removing Anagrams Easy Array, String, Hash_Table, Sorting 2 99.10 2272 Substring With Largest Variance Hard Array, Dynamic_Programming 469 23.66 2271 Maximum White Tiles Covered by a Carpet Medium Array, Sorting, Greedy, Binary_Search, Prefix_Sum 74 71.51 2270 Number of Ways to Split Array Medium Array, Prefix_Sum 4 77.55 2269 Find the K-Beauty of a Number Easy String, Math, Sliding_Window 2 38.88 2267 Check if There Is a Valid Parentheses String Path Hard Array, Dynamic_Programming, Matrix 93 77.48 2266 Count Number of Texts Medium String, Hash_Table, Dynamic_Programming, Math 38 81.43 2265 Count Nodes Equal to Average of Subtree Medium Depth_First_Search, Tree, Binary_Tree 1 99.12 2264 Largest 3-Same-Digit Number in String Easy String 3 74.57 2262 Total Appeal of A String Hard String, Hash_Table, Dynamic_Programming 6 97.92 2261 K Divisible Elements Subarrays Medium Array, Hash_Table, Trie, Enumeration, Hash_Function, Rolling_Hash 73 92.32 2260 Minimum Consecutive Cards to Pick Up Medium Array, Hash_Table, Sliding_Window 50 97.04 2259 Remove Digit From Number to Maximize Result Easy String, Greedy, Enumeration 1 97.73 2258 Escape the Spreading Fire Hard Array, Breadth_First_Search, Binary_Search, Matrix 33 77.40 2257 Count Unguarded Cells in the Grid Medium Array, Matrix, Simulation 32 70.28 2256 Minimum Average Difference Medium Array, Prefix_Sum 15 97.85 2255 Count Prefixes of a Given String Easy Array, String 1 94.82 2251 Number of Flowers in Full Bloom Hard Array, Hash_Table, Sorting, Binary_Search, Prefix_Sum, Ordered_Set 113 69.23 2250 Count Number of Rectangles Containing Each Point Medium Array, Sorting, Binary_Search, Binary_Indexed_Tree 49 98.80 2249 Count Lattice Points Inside a Circle Medium Array, Hash_Table, Math, Enumeration, Geometry 54 92.07 2248 Intersection of Multiple Arrays Easy Array, Hash_Table, Counting 2 99.46 2246 Longest Path With Different Adjacent Characters Hard Array, String, Depth_First_Search, Tree, Graph, Topological_Sort 75 97.79 2245 Maximum Trailing Zeros in a Cornered Path Medium Array, Matrix, Prefix_Sum 96 88.49 2244 Minimum Rounds to Complete All Tasks Medium Array, Hash_Table, Greedy, Counting 13 94.26 2243 Calculate Digit Sum of a String Easy String, Simulation 1 91.46 2242 Maximum Score of a Node Sequence Hard Array, Sorting, Graph, Enumeration 28 97.57 2241 Design an ATM Machine Medium Array, Greedy, Design 192 24.16 2240 Number of Ways to Buy Pens and Pencils Medium Math, Enumeration 19 68.73 2239 Find Closest Number to Zero Easy Array 2 84.21 2236 Root Equals Sum of Children Easy Tree, Binary_Tree 0 100.00 2235 Add Two Integers Easy Math 1 48.94 2234 Maximum Total Beauty of the Gardens Hard Array, Sorting, Greedy, Binary_Search, Two_Pointers 63 73.03 2233 Maximum Product After K Increments Medium Array, Greedy, Heap_Priority_Queue 364 75.06 2232 Minimize Result by Adding Parentheses to Expression Medium String, Enumeration 1 99.60 2231 Largest Number After Digit Swaps by Parity Easy Sorting, Heap_Priority_Queue 1 98.32 2227 Encrypt and Decrypt Strings Hard Array, String, Hash_Table, Design, Trie 143 74.74 2226 Maximum Candies Allocated to K Children Medium Array, Binary_Search 46 78.19 2225 Find Players With Zero or One Losses Medium Array, Hash_Table, Sorting, Counting 96 87.03 2224 Minimum Number of Operations to Convert Time Easy String, Greedy 1 97.78 2223 Sum of Scores of Built Strings Hard String, Binary_Search, Hash_Function, String_Matching, Rolling_Hash, Suffix_Array 21 63.91 2222 Number of Ways to Select Buildings Medium String, Dynamic_Programming, Prefix_Sum 19 98.28 2221 Find Triangular Sum of an Array Medium Array, Math, Simulation, Combinatorics 78 83.64 2220 Minimum Bit Flips to Convert Number Easy Bit_Manipulation 1 67.86 2218 Maximum Value of K Coins From Piles Hard Array, Dynamic_Programming, Prefix_Sum 54 96.38 2217 Find Palindrome With Fixed Length Medium Array, Math 37 88.60 2216 Minimum Deletions to Make Array Beautiful Medium Array, Greedy, Stack 7 39.24 2215 Find the Difference of Two Arrays Easy Array, Hash_Table 11 87.39 2213 Longest Substring of One Repeating Character Hard Array, String, Ordered_Set, Segment_Tree 141 86.81 2212 Maximum Points in an Archery Competition Medium Array, Bit_Manipulation, Recursion, Enumeration 7 78.16 2211 Count Collisions on a Road Medium String, Stack 113 45.96 2210 Count Hills and Valleys in an Array Easy Array 0 100.00 2209 Minimum White Tiles After Covering With Carpets Hard String, Dynamic_Programming, Prefix_Sum 94 88.16 2208 Minimum Operations to Halve Array Sum Medium Array, Greedy, Heap_Priority_Queue 237 89.24 2207 Maximize Number of Subsequences in a String Medium String, Greedy, Prefix_Sum 8 100 2206 Divide Array Into Equal Pairs Easy Array, Hash_Table, Bit_Manipulation, Counting 1 100.00 2203 Minimum Weighted Subgraph With the Required Paths Hard Graph, Shortest_Path 92 97.26 2202 Maximize the Topmost Element After K Moves Medium Array, Greedy 1 100.00 2201 Count Artifacts That Can Be Extracted Medium Array, Hash_Table, Simulation 7 82.97 2200 Find All K-Distant Indices in an Array Easy Array 2 95.30 2197 Replace Non-Coprime Numbers in Array Hard Array, Math, Stack, Number_Theory 60 85.52 2196 Create Binary Tree From Descriptions Medium Array, Hash_Table, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree 85 76.70 2195 Append K Integers With Minimal Sum Medium Array, Math, Sorting, Greedy 19 96.88 2194 Cells in a Range on an Excel Sheet Easy String 1 99.92 2193 Minimum Number of Moves to Make Palindrome Hard String, Greedy, Two_Pointers, Binary_Indexed_Tree 8 98.76 2192 All Ancestors of a Node in a Directed Acyclic Graph Medium Depth_First_Search, Breadth_First_Search, Graph, Topological_Sort 82 90.80 2191 Sort the Jumbled Numbers Medium Array, Sorting 117 96.53 2190 Most Frequent Number Following Key In an Array Easy Array, Hash_Table, Counting 1 100.00 2188 Minimum Time to Finish the Race Hard Array, Dynamic_Programming 15 93.69 2187 Minimum Time to Complete Trips Medium Array, Binary_Search 187 95.03 2186 Minimum Number of Steps to Make Two Strings Anagram II Medium String, Hash_Table, Counting 22 77.11 2185 Counting Words With a Given Prefix Easy Array, String 0 100.00 2183 Count Array Pairs Divisible by K Hard Array, Math, Number_Theory 849 44.54 2182 Construct String With Repeat Limit Medium String, Greedy, Heap_Priority_Queue, Counting 26 96.11 2181 Merge Nodes in Between Zeros Medium Simulation, Linked_List 6 96.26 2180 Count Integers With Even Digit Sum Easy Math, Simulation 0 100.00 2179 Count Good Triplets in an Array Hard Array, Binary_Search, Ordered_Set, Divide_and_Conquer, Segment_Tree, Binary_Indexed_Tree, Merge_Sort 16 92.94 2178 Maximum Split of Positive Even Integers Medium Math, Greedy 16 78.96 2177 Find Three Consecutive Integers That Sum to a Given Number Medium Math, Simulation 1 78.46 2176 Count Equal and Divisible Pairs in an Array Easy Array 4 78.29 2172 Maximum AND Sum of Array Hard Array, Dynamic_Programming, Bit_Manipulation, Bitmask 21 87.50 2171 Removing Minimum Number of Magic Beans Medium Array, Sorting, Prefix_Sum 42 77.68 2170 Minimum Operations to Make the Array Alternating Medium Array, Hash_Table, Greedy, Counting 8 100.00 2169 Count Operations to Obtain Zero Easy Math, Simulation 0 100.00 2167 Minimum Time to Remove All Cars Containing Illegal Goods Hard String, Dynamic_Programming 46 61.00 2166 Design Bitset Medium Array, Hash_Table, Design 81 73.38 2165 Smallest Value of the Rearranged Number Medium Math, Sorting 1 100.00 2164 Sort Even and Odd Indices Independently Easy Array, Sorting 2 97.22 2163 Minimum Difference in Sums After Removal of Elements Hard Array, Dynamic_Programming, Heap_Priority_Queue 298 57.14 2162 Minimum Cost to Set Cooking Time Medium Math, Enumeration 1 95.82 2161 Partition Array According to Given Pivot Medium Array, Two_Pointers, Simulation 7 72.76 2160 Minimum Sum of Four Digit Number After Splitting Digits Easy Math, Sorting, Greedy 1 78.31 2157 Groups of Strings Hard String, Bit_Manipulation, Union_Find 451 93.86 2156 Find Substring With Given Hash Value Hard String, Sliding_Window, Hash_Function, Rolling_Hash 37 36.57 2155 All Divisions With the Highest Score of a Binary Array Medium Array 18 98.41 2154 Keep Multiplying Found Values by Two Easy Array, Hash_Table, Sorting, Simulation 1 93.21 2151 Maximum Good People Based on Statements Hard Array, Bit_Manipulation, Backtracking, Enumeration 76 47.57 2150 Find All Lonely Numbers in the Array Medium Array, Hash_Table, Counting 93 70.66 2149 Rearrange Array Elements by Sign Medium Array, Two_Pointers, Simulation 10 34.66 2148 Count Elements With Strictly Smaller and Greater Elements Easy Array, Sorting 0 100.00 2147 Number of Ways to Divide a Long Corridor Hard String, Dynamic_Programming, Math 54 62.96 2146 K Highest Ranked Items Within a Price Range Medium Array, Sorting, Breadth_First_Search, Matrix, Heap_Priority_Queue 81 88.84 2145 Count the Hidden Sequences Medium Array, Prefix_Sum 7 36.03 2144 Minimum Cost of Buying Candies With Discount Easy Array, Sorting, Greedy 2 97.50 2141 Maximum Running Time of N Computers Hard Array, Sorting, Greedy, Binary_Search 24 70.39 2140 Solving Questions With Brainpower Medium Array, Dynamic_Programming 5 98.77 2139 Minimum Moves to Reach Target Score Medium Math, Greedy 1 37.95 2138 Divide a String Into Groups of Size k Easy String, Simulation 2 70.97 2136 Earliest Possible Day of Full Bloom Hard Array, Sorting, Greedy 63 94.92 2135 Count Words Obtained After Adding a Letter Medium Array, String, Hash_Table, Sorting, Bit_Manipulation 67 93.08 2134 Minimum Swaps to Group All 1's Together II Medium Array, Sliding_Window 11 72.59 2133 Check if Every Row and Column Contains All Numbers Easy Array, Hash_Table, Matrix 32 64.12 2132 Stamping the Grid Hard Array, Greedy, Matrix, Prefix_Sum 7 100.00 2131 Longest Palindrome by Concatenating Two Letter Words Medium Array, String, Hash_Table, Greedy, Counting 73 76.60 2130 Maximum Twin Sum of a Linked List Medium Two_Pointers, Stack, Linked_List 9 57.92 2129 Capitalize the Title Easy String 2 94.22 2127 Maximum Employees to Be Invited to a Meeting Hard Depth_First_Search, Graph, Topological_Sort 37 85.71 2126 Destroying Asteroids Medium Array, Sorting, Greedy 6 99.27 2125 Number of Laser Beams in a Bank Medium Array, String, Math, Matrix 19 76.00 2124 Check if All A's Appears Before All B's Easy String 1 73.82 2122 Recover the Original Array Hard Array, Hash_Table, Sorting, Enumeration 19 89.04 2121 Intervals Between Identical Elements Medium Array, Hash_Table, Prefix_Sum 93 79.63 2120 Execution of All Suffix Instructions Staying in a Grid Medium String, Simulation 31 88.00 2119 A Number After a Double Reversal Easy Math 0 100.00 2117 Abbreviating the Product of a Range Hard Math 70 89.47 2116 Check if a Parentheses String Can Be Valid Medium String, Greedy, Stack 19 85.53 2115 Find All Possible Recipes from Given Supplies Medium Array, String, Hash_Table, Graph, Topological_Sort 43 85.86 2114 Maximum Number of Words Found in Sentences Easy Array, String 4 69.59 2111 Minimum Operations to Make the Array K-Increasing Hard Array, Binary_Search 97 22.90 2110 Number of Smooth Descent Periods of a Stock Medium Array, Dynamic_Programming, Math 3 77.27 2109 Adding Spaces to a String Medium Array, String, Simulation 24 89.33 2108 Find First Palindromic String in the Array Easy Array, String, Two_Pointers 3 84.92 2106 Maximum Fruits Harvested After at Most K Steps Hard Array, Binary_Search, Prefix_Sum, Sliding_Window 4 86.67 2105 Watering Plants II Medium Array, Two_Pointers, Simulation 5 78.24 2104 Sum of Subarray Ranges Medium Array, Stack, Monotonic_Stack 21 77.85 2103 Rings and Rods Easy String, Hash_Table 2 46.84 2102 Sequentially Ordinal Rank Tracker Hard Design, Heap_Priority_Queue, Ordered_Set, Data_Stream 194 79.48 2101 Detonate the Maximum Bombs Medium Array, Math, Depth_First_Search, Breadth_First_Search, Graph, Geometry 27 94.17 2100 Find Good Days to Rob the Bank Medium Array, Dynamic_Programming, Prefix_Sum 13 46.46 2099 Find Subsequence of Length K With the Largest Sum Easy Array, Hash_Table, Sorting, Heap_Priority_Queue 6 85.46 2097 Valid Arrangement of Pairs Hard Depth_First_Search, Graph, Eulerian_Circuit 158 100.00 2096 Step-By-Step Directions From a Binary Tree Node to Another Medium String, Depth_First_Search, Tree, Binary_Tree 30 76.29 2095 Delete the Middle Node of a Linked List Medium Two_Pointers, Linked_List 4 95.21 2094 Finding 3-Digit Even Numbers Easy Array, Hash_Table, Sorting, Enumeration 2 99.62 2092 Find All People With Secret Hard Sorting, Depth_First_Search, Breadth_First_Search, Graph, Union_Find 95 84.86 2091 Removing Minimum and Maximum From Array Medium Array, Greedy 2 100.00 2090 K Radius Subarray Averages Medium Array, Sliding_Window 12 83.19 2089 Find Target Indices After Sorting Array Easy Array, Sorting, Binary_Search 1 97.90 2088 Count Fertile Pyramids in a Land Hard Array, Dynamic_Programming, Matrix 12 83.56 2087 Minimum Cost Homecoming of a Robot in a Grid Medium Array, Greedy, Matrix 2 79.89 2086 Minimum Number of Buckets Required to Collect Rainwater from Houses Medium String, Dynamic_Programming, Greedy 8 73.71 2085 Count Common Words With One Occurrence Easy Array, String, Hash_Table, Counting 6 77.66 2081 Sum of k-Mirror Numbers Hard Math, Enumeration 759 81.69 2080 Range Frequency Queries Medium Array, Hash_Table, Binary_Search, Design, Segment_Tree 140 97.86 2079 Watering Plants Medium Array 0 100.00 2078 Two Furthest Houses With Different Colors Easy Array, Greedy 0 100.00 2076 Process Restricted Friend Requests Hard Graph, Union_Find 102 55.25 2075 Decode the Slanted Ciphertext Medium String, Simulation 48 68.23 2074 Reverse Nodes in Even Length Groups Medium Linked_List 9 62.36 2073 Time Needed to Buy Tickets Easy Array, Simulation, Queue 0 100.00 2071 Maximum Number of Tasks You Can Assign Hard Array, Sorting, Greedy, Binary_Search, Queue, Monotonic_Queue 156 40.49 2070 Most Beautiful Item for Each Query Medium Array, Sorting, Binary_Search 53 96.04 2069 Walking Robot Simulation II Medium Design, Simulation 110 56.14 2068 Check Whether Two Strings are Almost Equivalent Easy String, Hash_Table, Counting 1 95.21 2065 Maximum Path Quality of a Graph Hard Array, Graph, Backtracking 94 95.34 2064 Minimized Maximum of Products Distributed to Any Store Medium Array, Binary_Search 65 70.18 2063 Vowels of All Substrings Medium String, Dynamic_Programming, Math, Combinatorics 21 34.49 2062 Count Vowel Substrings of a String Easy String, Hash_Table 34 23.83 2060 Check if an Original String Exists Given Two Encoded Strings Hard String, Dynamic_Programming 354 69.39 2059 Minimum Operations to Convert Number Medium Array, Breadth_First_Search 97 64.14 2058 Find the Minimum and Maximum Number of Nodes Between Critical Points Medium Linked_List 4 100.00 2057 Smallest Index With Equal Value Easy Array 1 94.39 2056 Number of Valid Move Combinations On Chessboard Hard Array, String, Simulation, Backtracking 433 24.83 2055 Plates Between Candles Medium Array, String, Binary_Search, Prefix_Sum 10 92.49 2054 Two Best Non-Overlapping Events Medium Array, Dynamic_Programming, Sorting, Binary_Search, Heap_Priority_Queue 58 70.59 2053 Kth Distinct String in an Array Easy Array, String, Hash_Table, Counting 7 65.75 2050 Parallel Courses III Hard Dynamic_Programming, Graph, Topological_Sort 33 86.04 2049 Count Nodes With the Highest Score Medium Array, Depth_First_Search, Tree, Binary_Tree 40 93.75 2048 Next Greater Numerically Balanced Number Medium Math, Backtracking, Enumeration 2 95.19 2047 Number of Valid Words in a Sentence Easy String 19 42.57 2045 Second Minimum Time to Reach Destination Hard Breadth_First_Search, Graph, Shortest_Path 65 74.03 2044 Count Number of Maximum Bitwise-OR Subsets Medium Array, Bit_Manipulation, Backtracking 12 58.97 2043 Simple Bank System Medium Array, Hash_Table, Design, Simulation 128 72.30 2042 Check if Numbers Are Ascending in a Sentence Easy String 2 75.46 2040 Kth Smallest Product of Two Sorted Arrays Hard Array, Binary_Search 635 75.24 2039 The Time When the Network Becomes Idle Medium Array, Breadth_First_Search, Graph 134 72.29 2038 Remove Colored Pieces if Both Neighbors are the Same Color Medium String, Math, Greedy, Game_Theory 22 47.78 2037 Minimum Number of Moves to Seat Everyone Easy Array, Sorting 5 22.01 2035 Partition Array Into Two Arrays to Minimize Sum Difference Hard Array, Dynamic_Programming, Binary_Search, Two_Pointers, Bit_Manipulation, Ordered_Set, Bitmask 1336 39.36 2034 Stock Price Fluctuation Medium Hash_Table, Design, Heap_Priority_Queue, Ordered_Set, Data_Stream 163 65.51 2033 Minimum Operations to Make a Uni-Value Grid Medium Array, Math, Sorting, Matrix 41 87.53 2032 Two Out of Three Easy Array, Hash_Table 9 45.56 2030 Smallest K-Length Subsequence With Occurrences of a Letter Hard String, Greedy, Stack, Monotonic_Stack 131 64.46 2029 Stone Game IX Medium Array, Math, Greedy, Counting, Game_Theory 14 53.97 2028 Find Missing Observations Medium Array, Math, Simulation 10 31.40 2027 Minimum Moves to Convert String Easy String, Greedy 0 100.00 2025 Maximum Number of Ways to Partition an Array Hard Array, Hash_Table, Prefix_Sum, Counting, Enumeration 172 100.00 2024 Maximize the Confusion of an Exam Medium String, Binary_Search, Prefix_Sum, Sliding_Window 21 44.78 2023 Number of Pairs of Strings With Concatenation Equal to Target Medium Array, String 36 36.00 2022 Convert 1D Array Into 2D Array Easy Array, Matrix, Simulation 8 40.41 2019 The Score of Students Solving Math Expression Hard Array, String, Dynamic_Programming, Math, Stack, Memoization 435 89.93 2018 Check if Word Can Be Placed In Crossword Medium Array, Matrix, Enumeration 11 52.76 2017 Grid Game Medium Array, Matrix, Prefix_Sum 10 41.46 2016 Maximum Difference Between Increasing Elements Easy Array 0 100.00 2014 Longest Subsequence Repeated k Times Hard String, Greedy, Backtracking, Counting, Enumeration 169 98.59 2013 Detect Squares Medium Array, Hash_Table, Design, Counting 67 88.46 2012 Sum of Beauty in the Array Medium Array 10 44.69 2011 Final Value of Variable After Performing Operations Easy Array, String, Simulation 1 94.40 2009 Minimum Number of Operations to Make Array Continuous Hard Array, Binary_Search 57 72.43 2008 Maximum Earnings From Taxi Medium Array, Dynamic_Programming, Sorting, Binary_Search 116 55.59 2007 Find Original Array From Doubled Array Medium Array, Hash_Table, Sorting, Greedy 41 96.48 2006 Count Number of Pairs With Absolute Difference K Easy Array, Hash_Table, Counting 8 58.60 2003 Smallest Missing Genetic Value in Each Subtree Hard Dynamic_Programming, Depth_First_Search, Tree, Union_Find 126 85.18 2002 Maximum Product of the Length of Two Palindromic Subsequences Medium String, Dynamic_Programming, Bit_Manipulation, Backtracking, Bitmask 69 89.94 2001 Number of Pairs of Interchangeable Rectangles Medium Array, Hash_Table, Math, Counting, Number_Theory 34 99.02 2000 Reverse Prefix of Word Easy String, Two_Pointers 0 100.00 1998 GCD Sort of an Array Hard Array, Math, Sorting, Union_Find 51 100.00 1997 First Day Where You Have Been in All the Rooms Medium Array, Dynamic_Programming 14 83.10 1996 The Number of Weak Characters in the Game Medium Array, Sorting, Greedy, Stack, Monotonic_Stack 121 81.46 1995 Count Special Quadruplets Easy Array, Enumeration 2 99.20 1994 The Number of Good Subsets Hard Array, Dynamic_Programming, Math, Bit_Manipulation, Bitmask 15 94.29 1993 Operations on Tree Medium Hash_Table, Depth_First_Search, Breadth_First_Search, Tree, Design 394 23.03 1992 Find All Groups of Farmland Medium Array, Depth_First_Search, Breadth_First_Search, Matrix 7 89.08 1991 Find the Middle Index in Array Easy Array, Prefix_Sum 0 100.00 1987 Number of Unique Good Subsequences Hard String, Dynamic_Programming 19 53.78 1986 Minimum Number of Work Sessions to Finish the Tasks Medium Array, Dynamic_Programming, Bit_Manipulation, Backtracking, Bitmask 2 90.18 1985 Find the Kth Largest Integer in the Array Medium Array, String, Sorting, Heap_Priority_Queue, Divide_and_Conquer, Quickselect 34 77.42 1984 Minimum Difference Between Highest and Lowest of K Scores Easy Array, Sorting, Sliding_Window 4 95.43 1982 Find Array Given Subset Sums Hard Array, Divide_and_Conquer 70 64.91 1981 Minimize the Difference Between Target and Chosen Elements Medium Array, Dynamic_Programming, Matrix 480 90.78 1980 Find Unique Binary String Medium Array, String, Backtracking 7 31.88 1979 Find Greatest Common Divisor of Array Easy Array, Math, Number_Theory 1 87.75 1977 Number of Ways to Separate Numbers Hard String, Dynamic_Programming, Suffix_Array 604 59.21 1976 Number of Ways to Arrive at Destination Medium Dynamic_Programming, Graph, Topological_Sort, Shortest_Path 14 77.59 1975 Maximum Matrix Sum Medium Array, Greedy, Matrix 4 100.00 1974 Minimum Time to Type Word Using Special Typewriter Easy String, Greedy 1 74.90 1971 Find if Path Exists in Graph Easy Depth_First_Search, Breadth_First_Search, Graph 4 99.57 1970 Last Day Where You Can Still Cross Hard Array, Depth_First_Search, Breadth_First_Search, Binary_Search, Matrix, Union_Find 14 95.24 1969 Minimum Non-Zero Product of the Array Elements Medium Math, Greedy, Recursion 0 100.00 1968 Array With Elements Not Equal to Average of Neighbors Medium Array, Sorting, Greedy 6 92.86 1967 Number of Strings That Appear as Substrings in Word Easy String 1 82.02 1965 Employees With Missing Information Easy Database, SQL_I_Day_4_Union_and_Select 617 30.40 1964 Find the Longest Valid Obstacle Course at Each Position Hard Array, Binary_Search, Binary_Indexed_Tree 79 85.00 1963 Minimum Number of Swaps to Make the String Balanced Medium String, Greedy, Two_Pointers, Stack 17 93.71 1962 Remove Stones to Minimize the Total Medium Array, Heap_Priority_Queue 761 48.67 1961 Check If String Is a Prefix of Array Easy Array, String 2 60.87 1960 Maximum Product of the Length of Two Palindromic Substrings Hard String, Hash_Function, Rolling_Hash 32 75.00 1959 Minimum Total Space Wasted With K Resizing Operations Medium Array, Dynamic_Programming 42 95.45 1958 Check if Move is Legal Medium Array, Matrix, Enumeration 0 100.00 1957 Delete Characters to Make Fancy String Easy String 54 52.94 1955 Count Number of Special Subsequences Hard Array, Dynamic_Programming 22 80.65 1954 Minimum Garden Perimeter to Collect Enough Apples Medium Math, Binary_Search 2 59.57 1953 Maximum Number of Weeks for Which You Can Work Medium Array, Greedy 4 40.93 1952 Three Divisors Easy Math 1 84.91 1948 Delete Duplicate Folders in System Hard Array, String, Hash_Table, Trie, Hash_Function 92 97.82 1947 Maximum Compatibility Score Sum Medium Array, Dynamic_Programming, Bit_Manipulation, Backtracking, Bitmask 2 95.90 1946 Largest Number After Mutating Substring Medium Array, String, Greedy 18 70.91 1945 Sum of Digits of String After Convert Easy String, Simulation 2 72.10 1944 Number of Visible People in a Queue Hard Array, Stack, Monotonic_Stack 9 99.65 1943 Describe the Painting Medium Array, Prefix_Sum 29 93.92 1942 The Number of the Smallest Unoccupied Chair Medium Array, Heap_Priority_Queue, Ordered_Set 73 49.69 1941 Check if All Characters Have Equal Number of Occurrences Easy String, Hash_Table, Counting 2 86.25 1938 Maximum Genetic Difference Query Hard Array, Bit_Manipulation, Trie 174 100.00 1937 Maximum Number of Points with Cost Medium Array, Dynamic_Programming 18 44.04 1936 Add Minimum Number of Rungs Medium Array, Greedy 1 100.00 1935 Maximum Number of Words You Can Type Easy String, Hash_Table 2 95.06 1932 Merge BSTs to Create Single BST Hard Hash_Table, Depth_First_Search, Tree, Binary_Search, Binary_Tree 87 48.43 1931 Painting a Grid With Three Different Colors Hard Dynamic_Programming 7 99.32 1930 Unique Length-3 Palindromic Subsequences Medium String, Hash_Table, Prefix_Sum 31 93.44 1929 Concatenation of Array Easy Array 1 92.52 1928 Minimum Cost to Reach Destination in Time Hard Dynamic_Programming, Graph 52 87.97 1927 Sum Game Medium Math, Greedy, Game_Theory 13 34.41 1926 Nearest Exit from Entrance in Maze Medium Array, Breadth_First_Search, Matrix, Graph_Theory_I_Day_6_Matrix_Related_Problems 12 40.55 1925 Count Square Sum Triples Easy Math, Enumeration 25 48.78 1923 Longest Common Subpath Hard Array, Binary_Search, Hash_Function, Rolling_Hash, Suffix_Array 517 73.88 1922 Count Good Numbers Medium Math, Recursion 1 87.11 1921 Eliminate Maximum Number of Monsters Medium Array, Sorting, Greedy 19 90.78 1920 Build Array from Permutation Easy Array, Simulation 1 94.23 1916 Count Ways to Build Rooms in an Ant Colony Hard Dynamic_Programming, Math, Tree, Graph, Topological_Sort, Combinatorics 1527 34.38 1915 Number of Wonderful Substrings Medium String, Hash_Table, Bit_Manipulation, Prefix_Sum 31 82.46 1914 Cyclically Rotating a Grid Medium Array, Matrix, Simulation 2 91.30 1913 Maximum Product Difference Between Two Pairs Easy Array, Sorting 7 70.01 1912 Design Movie Rental System Hard Array, Hash_Table, Design, Heap_Priority_Queue, Ordered_Set 562 74.14 1911 Maximum Alternating Subsequence Sum Medium Array, Dynamic_Programming 12 51.75 1910 Remove All Occurrences of a Substring Medium String 11 39.18 1909 Remove One Element to Make the Array Strictly Increasing Easy Array 0 100.00 1906 Minimum Absolute Difference Queries Medium Array, Hash_Table 176 71.61 1905 Count Sub Islands Medium Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find, Graph_Theory_I_Day_3_Matrix_Related_Problems 24 85.54 1904 The Number of Full Rounds You Have Played Medium String, Math 0 100.00 1903 Largest Odd Number in String Easy String, Math, Greedy 6 23.18 1901 Find a Peak Element II Medium Array, Binary_Search, Matrix, Divide_and_Conquer, Binary_Search_II_Day_17 0 100.00 1900 The Earliest and Latest Rounds Where Players Compete Hard Dynamic_Programming, Memoization 1 92.68 1899 Merge Triplets to Form Target Triplet Medium Array, Greedy 1 98.96 1898 Maximum Number of Removable Characters Medium Array, String, Binary_Search, Binary_Search_II_Day_6 121 72.51 1897 Redistribute Characters to Make All Strings Equal Easy String, Hash_Table, Counting 2 100.00 1896 Minimum Cost to Change the Final Value of Expression Hard String, Dynamic_Programming, Math, Stack 29 95.24 1895 Largest Magic Square Medium Array, Matrix, Prefix_Sum 7 80.72 1894 Find the Student that Will Replace the Chalk Medium Array, Binary_Search, Simulation, Prefix_Sum, Binary_Search_II_Day_2 2 76.67 1893 Check if All the Integers in a Range Are Covered Easy Array, Hash_Table, Prefix_Sum 1 72.81 1890 The Latest Login in 2020 Easy Database, SQL_I_Day_8_Function 571 73.59 1889 Minimum Space Wasted From Packaging Hard Array, Sorting, Binary_Search, Prefix_Sum 98 45.92 1888 Minimum Number of Flips to Make the Binary String Alternating Medium String, Greedy 30 75.70 1887 Reduction Operations to Make the Array Elements Equal Medium Array, Sorting 26 94.56 1886 Determine Whether Matrix Can Be Obtained By Rotation Easy Array, Matrix, Programming_Skills_II_Day_7 1 78.38 1884 Egg Drop With 2 Eggs and N Floors Medium Dynamic_Programming, Math 0 100.00 1883 Minimum Skips to Arrive at Meeting On Time Hard Array, Dynamic_Programming 70 73.08 1882 Process Tasks Using Servers Medium Array, Heap_Priority_Queue 290 77.45 1881 Maximum Value after Insertion Medium String, Greedy 12 85.08 1880 Check if Word Equals Summation of Two Words Easy String 2 31.97 1879 Minimum XOR Sum of Two Arrays Hard Array, Dynamic_Programming, Bit_Manipulation, Bitmask 15 63.49 1878 Get Biggest Three Rhombus Sums in a Grid Medium Array, Math, Sorting, Matrix, Heap_Priority_Queue, Prefix_Sum 41 82.03 1877 Minimize Maximum Pair Sum in Array Medium Array, Sorting, Greedy, Two_Pointers 62 82.87 1876 Substrings of Size Three with Distinct Characters Easy String, Hash_Table, Counting, Sliding_Window 2 60.62 1873 Calculate Special Bonus Easy Database, SQL_I_Day_2_Select_and_Order 543 71.60 1872 Stone Game VIII Hard Array, Dynamic_Programming, Math, Prefix_Sum, Game_Theory 3 98.18 1871 Jump Game VII Medium String, Two_Pointers, Prefix_Sum 14 76.25 1870 Minimum Speed to Arrive on Time Medium Array, Binary_Search, Binary_Search_II_Day_6 86 88.58 1869 Longer Contiguous Segments of Ones than Zeros Easy String 1 88.10 1866 Number of Ways to Rearrange Sticks With K Sticks Visible Hard Dynamic_Programming, Math, Combinatorics 67 96.33 1865 Finding Pairs With a Certain Sum Medium Array, Hash_Table, Design 195 83.97 1864 Minimum Number of Swaps to Make the Binary String Alternating Medium String, Greedy 3 43.20 1863 Sum of All Subset XOR Totals Easy Array, Math, Bit_Manipulation, Backtracking, Combinatorics 0 100.00 1862 Sum of Floored Pairs Hard Array, Math, Binary_Search, Prefix_Sum 115 70.91 1861 Rotating the Box Medium Array, Matrix, Two_Pointers 8 92.84 1860 Incremental Memory Leak Medium Simulation 5 78.57 1859 Sorting the Sentence Easy String, Sorting 2 50.32 1857 Largest Color Value in a Directed Graph Hard Hash_Table, Dynamic_Programming, Graph, Counting, Memoization, Topological_Sort 110 73.53 1856 Maximum Subarray Min-Product Medium Array, Stack, Prefix_Sum, Monotonic_Stack 28 92.10 1855 Maximum Distance Between a Pair of Values Medium Array, Greedy, Binary_Search, Two_Pointers, Binary_Search_I_Day_11 4 62.20 1854 Maximum Population Year Easy Array, Counting 0 100.00 1851 Minimum Interval to Include Each Query Hard Array, Sorting, Binary_Search, Heap_Priority_Queue, Line_Sweep 140 84.24 1850 Minimum Adjacent Swaps to Reach the Kth Smallest Number Medium String, Greedy, Two_Pointers 24 72.99 1849 Splitting a String Into Descending Consecutive Values Medium String, Backtracking 1 87.61 1848 Minimum Distance to the Target Element Easy Array 1 58.33 1847 Closest Room Hard Array, Sorting, Binary_Search 95 81.67 1846 Maximum Element After Decreasing and Rearranging Medium Array, Sorting, Greedy 4 93.59 1845 Seat Reservation Manager Medium Design, Heap_Priority_Queue, Programming_Skills_II_Day_17 47 87.63 1844 Replace All Digits with Characters Easy String 1 70.12 1840 Maximum Building Height Hard Array, Math 59 94.64 1839 Longest Substring Of All Vowels in Order Medium String, Sliding_Window 24 86.13 1838 Frequency of the Most Frequent Element Medium Array, Sorting, Greedy, Binary_Search, Prefix_Sum, Sliding_Window, Binary_Search_II_Day_9 11 100.00 1837 Sum of Digits in Base K Easy Math 1 10.42 1835 Find XOR Sum of All Pairs Bitwise AND Hard Array, Math, Bit_Manipulation 1 100.00 1834 Single-Threaded CPU Medium Array, Sorting, Heap_Priority_Queue 134 83.22 1833 Maximum Ice Cream Bars Medium Array, Sorting, Greedy 39 84.49 1832 Check if the Sentence Is Pangram Easy String, Hash_Table 3 41.29 1830 Minimum Number of Operations to Make String Sorted Hard String, Math, Combinatorics 125 94.12 1829 Maximum XOR for Each Query Medium Array, Bit_Manipulation, Prefix_Sum 7 20.94 1828 Queries on Number of Points Inside a Circle Medium Array, Math, Geometry 23 75.03 1827 Minimum Operations to Make the Array Increasing Easy Array, Greedy 4 35.67 1825 Finding MK Average Hard Design, Heap_Priority_Queue, Ordered_Set, Queue 83 60.59 1824 Minimum Sideway Jumps Medium Array, Dynamic_Programming, Greedy 17 96.34 1823 Find the Winner of the Circular Game Medium Array, Math, Simulation, Recursion, Queue, Data_Structure_II_Day_14_Stack_Queue 3 64.85 1822 Sign of the Product of an Array Easy Array, Math, Programming_Skills_I_Day_4_Loop 1 58.05 1819 Number of Different Subsequences GCDs Hard Array, Math, Counting, Number_Theory 116 96.43 1818 Minimum Absolute Sum Difference Medium Array, Sorting, Binary_Search, Ordered_Set, Binary_Search_II_Day_7 13 99.44 1817 Finding the Users Active Minutes Medium Array, Hash_Table 16 91.64 1816 Truncate Sentence Easy Array, String 2 65.71 1815 Maximum Number of Groups Getting Fresh Donuts Hard Array, Dynamic_Programming, Bit_Manipulation, Bitmask, Memoization 7 86.67 1814 Count Nice Pairs in an Array Medium Array, Hash_Table, Math, Counting 47 83.12 1813 Sentence Similarity III Medium Array, String, Two_Pointers 3 41.38 1812 Determine Color of a Chessboard Square Easy String, Math 1 49.36 1808 Maximize Number of Nice Divisors Hard Math, Recursion 1 80.77 1807 Evaluate the Bracket Pairs of a String Medium Array, String, Hash_Table 40 80.47 1806 Minimum Number of Operations to Reinitialize a Permutation Medium Array, Math, Simulation 0 100.00 1805 Number of Different Integers in a String Easy String, Hash_Table 3 79.55 1803 Count Pairs With XOR in a Range Hard Array, Bit_Manipulation, Trie 77 100.00 1802 Maximum Value at a Given Index in a Bounded Array Medium Greedy, Binary_Search, Binary_Search_II_Day_17 2 58.44 1801 Number of Orders in the Backlog Medium Array, Heap_Priority_Queue, Simulation 39 78.46 1800 Maximum Ascending Subarray Sum Easy Array 0 100.00 1799 Maximize Score After N Operations Hard Array, Dynamic_Programming, Math, Bit_Manipulation, Backtracking, Bitmask, Number_Theory 164 78.22 1798 Maximum Number of Consecutive Values You Can Make Medium Array, Greedy 11 96.30 1797 Design Authentication Manager Medium Hash_Table, Design, Programming_Skills_II_Day_19 41 92.67 1796 Second Largest Digit in a String Easy String, Hash_Table 2 87.67 1795 Rearrange Products Table Easy Database, SQL_I_Day_4_Union_and_Select 497 64.83 1793 Maximum Score of a Good Subarray Hard Array, Binary_Search, Two_Pointers, Stack, Monotonic_Stack 3 97.56 1792 Maximum Average Pass Ratio Medium Array, Greedy, Heap_Priority_Queue 456 89.78 1791 Find Center of Star Graph Easy Graph 0 100.00 1790 Check if One String Swap Can Make Strings Equal Easy String, Hash_Table, Counting, Programming_Skills_I_Day_4_Loop 0 100.00 1787 Make the XOR of All Segments Equal to Zero Hard Array, Dynamic_Programming, Bit_Manipulation 102 89.47 1786 Number of Restricted Paths From First to Last Node Medium Dynamic_Programming, Heap_Priority_Queue, Graph, Topological_Sort, Shortest_Path 86 88.56 1785 Minimum Elements to Add to Form a Given Sum Medium Array, Greedy 2 70.75 1784 Check if Binary String Has at Most One Segment of Ones Easy String 1 65.60 1782 Count Pairs Of Nodes Hard Binary_Search, Two_Pointers, Graph 128 86.96 1781 Sum of Beauty of All Substrings Medium String, Hash_Table, Counting 38 100.00 1780 Check if Number is a Sum of Powers of Three Medium Math 2 19.71 1779 Find Nearest Point That Has the Same X or Y Coordinate Easy Array, Programming_Skills_I_Day_3_Conditional_Statements 1 100.00 1776 Car Fleet II Hard Array, Math, Stack, Heap_Priority_Queue, Monotonic_Stack 19 93.81 1775 Equal Sum Arrays With Minimum Number of Operations Medium Array, Hash_Table, Greedy, Counting 16 70.88 1774 Closest Dessert Cost Medium Array, Dynamic_Programming, Backtracking 5 82.32 1773 Count Items Matching a Rule Easy Array, String 3 98.33 1771 Maximize Palindrome Length From Subsequences Hard String, Dynamic_Programming 58 87.88 1770 Maximum Score from Performing Multiplication Operations Medium Array, Dynamic_Programming 31 92.41 1769 Minimum Number of Operations to Move All Balls to Each Box Medium Array, String 3 91.66 1768 Merge Strings Alternately Easy String, Two_Pointers, Programming_Skills_I_Day_8_String 1 86.26 1766 Tree of Coprimes Hard Math, Depth_First_Search, Breadth_First_Search, Tree 111 94.07 1765 Map of Highest Peak Medium Array, Breadth_First_Search, Matrix 64 85.40 1764 Form Array by Concatenating Subarrays of Another Array Medium Array, Greedy, String_Matching 7 16.90 1763 Longest Nice Substring Easy String, Hash_Table, Bit_Manipulation, Sliding_Window 5 61.88 1761 Minimum Degree of a Connected Trio in a Graph Hard Graph 33 89.17 1760 Minimum Limit of Balls in a Bag Medium Array, Binary_Search, Binary_Search_II_Day_3 44 78.49 1759 Count Number of Homogenous Substrings Medium String, Math 19 42.40 1758 Minimum Changes To Make Alternating Binary String Easy String 2 98.92 1757 Recyclable and Low Fat Products Easy Database, SQL_I_Day_1_Select 475 71.54 1755 Closest Subsequence Sum Hard Array, Dynamic_Programming, Two_Pointers, Bit_Manipulation, Bitmask 383 87.60 1754 Largest Merge Of Two Strings Medium String, Greedy, Two_Pointers 37 89.23 1753 Maximum Score From Removing Stones Medium Math, Greedy, Heap_Priority_Queue 0 100.00 1752 Check if Array Is Sorted and Rotated Easy Array 0 100.00 1751 Maximum Number of Events That Can Be Attended II Hard Array, Dynamic_Programming, Binary_Search 12 98.33 1750 Minimum Length of String After Deleting Similar Ends Medium String, Two_Pointers 5 68.68 1749 Maximum Absolute Sum of Any Subarray Medium Array, Dynamic_Programming 3 90.60 1748 Sum of Unique Elements Easy Array, Hash_Table, Counting 2 54.08 1745 Palindrome Partitioning IV Hard String, Dynamic_Programming 10 100.00 1744 Can You Eat Your Favorite Candy on Your Favorite Day? Medium Array, Prefix_Sum 5 100.00 1743 Restore the Array From Adjacent Pairs Medium Array, Hash_Table 95 99.08 1742 Maximum Number of Balls in a Box Easy Hash_Table, Math, Counting 7 98.87 1741 Find Total Time Spent by Each Employee Easy Database, SQL_I_Day_8_Function 414 93.27 1739 Building Boxes Hard Math, Greedy, Binary_Search 1 84.38 1738 Find Kth Largest XOR Coordinate Value Medium Array, Matrix, Bit_Manipulation, Heap_Priority_Queue, Prefix_Sum, Divide_and_Conquer, Quickselect 40 97.08 1737 Change Minimum Characters to Satisfy One of Three Conditions Medium String, Hash_Table, Prefix_Sum, Counting 8 87.70 1736 Latest Time by Replacing Hidden Digits Easy String, Greedy 3 35.96 1735 Count Ways to Make Array With Product Hard Array, Dynamic_Programming, Math 189 43.75 1734 Decode XORed Permutation Medium Array, Bit_Manipulation 6 34.52 1733 Minimum Number of People to Teach Medium Array, Greedy 11 98.57 1732 Find the Highest Altitude Easy Array, Prefix_Sum 0 100.00 1729 Find Followers Count Easy Database, SQL_I_Day_7_Function 456 88.39 1728 Cat and Mouse II Hard Array, Dynamic_Programming, Math, Matrix, Graph, Memoization, Topological_Sort, Game_Theory 12 99.12 1727 Largest Submatrix With Rearrangements Medium Array, Sorting, Greedy, Matrix 9 90.48 1726 Tuple with Same Product Medium Array, Hash_Table 235 90.73 1725 Number Of Rectangles That Can Form The Largest Square Easy Array 1 100.00 1723 Find Minimum Time to Finish All Jobs Hard Array, Dynamic_Programming, Bit_Manipulation, Backtracking, Bitmask 3 76.73 1722 Minimize Hamming Distance After Swap Operations Medium Array, Depth_First_Search, Union_Find 51 94.82 1721 Swapping Nodes in a Linked List Medium Two_Pointers, Linked_List 2 100.00 1720 Decode XORed Array Easy Array, Bit_Manipulation 1 100.00 1719 Number Of Ways To Reconstruct A Tree Hard Tree, Graph, Topological_Sort 91 67.57 1718 Construct the Lexicographically Largest Valid Sequence Medium Array, Backtracking 0 100.00 1717 Maximum Score From Removing Substrings Medium String, Greedy, Stack 19 99.25 1716 Calculate Money in Leetcode Bank Easy Math 1 65.33 1713 Minimum Operations to Make a Subsequence Hard Array, Hash_Table, Greedy, Binary_Search 81 95.39 1712 Ways to Split Array Into Three Subarrays Medium Array, Binary_Search, Two_Pointers, Prefix_Sum, Binary_Search_II_Day_10 16 84.24 1711 Count Good Meals Medium Array, Hash_Table 75 93.77 1710 Maximum Units on a Truck Easy Array, Sorting, Greedy 9 78.69 1707 Maximum XOR With an Element From Array Hard Array, Bit_Manipulation, Trie 150 97.24 1706 Where Will the Ball Fall Medium Array, Dynamic_Programming, Depth_First_Search, Matrix, Simulation 2 64.55 1705 Maximum Number of Eaten Apples Medium Array, Greedy, Heap_Priority_Queue 53 77.63 1704 Determine if String Halves Are Alike Easy String, Counting 1 100.00 1703 Minimum Adjacent Swaps for K Consecutive Ones Hard Array, Greedy, Prefix_Sum, Sliding_Window 10 96.25 1702 Maximum Binary String After Change Medium String, Greedy 42 82.86 1701 Average Waiting Time Medium Array, Simulation 2 100.00 1700 Number of Students Unable to Eat Lunch Easy Array, Stack, Simulation, Queue 2 63.14 1697 Checking Existence of Edge Length Limited Paths Hard Array, Sorting, Graph, Union_Find 94 90.48 1696 Jump Game VI Medium Array, Dynamic_Programming, Heap_Priority_Queue, Sliding_Window, Queue, Monotonic_Queue 23 86.05 1695 Maximum Erasure Value Medium Array, Hash_Table, Sliding_Window 5 99.82 1694 Reformat Phone Number Easy String 1 99.67 1693 Daily Leads and Partners Easy Database, SQL_I_Day_7_Function 463 78.98 1691 Maximum Height by Stacking Cuboids Hard Array, Dynamic_Programming, Sorting 6 83.07 1690 Stone Game VII Medium Array, Dynamic_Programming, Math, Game_Theory 18 96.71 1689 Partitioning Into Minimum Number Of Deci-Binary Numbers Medium String, Greedy 5 93.98 1688 Count of Matches in Tournament Easy Math, Simulation 0 100.00 1687 Delivering Boxes from Storage to Ports Hard Array, Dynamic_Programming, Heap_Priority_Queue, Queue, Segment_Tree, Monotonic_Queue 9 91.09 1686 Stone Game VI Medium Array, Math, Sorting, Greedy, Heap_Priority_Queue, Game_Theory 139 62.50 1685 Sum of Absolute Differences in a Sorted Array Medium Array, Math, Prefix_Sum 4 80.17 1684 Count the Number of Consistent Strings Easy Array, String, Hash_Table, Bit_Manipulation 6 97.04 1681 Minimum Incompatibility Hard Array, Dynamic_Programming, Bit_Manipulation, Bitmask 1 100.00 1680 Concatenation of Consecutive Binary Numbers Medium Math, Bit_Manipulation, Simulation 70 95.05 1679 Max Number of K-Sum Pairs Medium Array, Hash_Table, Sorting, Two_Pointers 20 91.22 1678 Goal Parser Interpretation Easy String, Programming_Skills_I_Day_8_String 0 100.00 1675 Minimize Deviation in Array Hard Array, Greedy, Heap_Priority_Queue, Ordered_Set 104 88.83 1674 Minimum Moves to Make Array Complementary Medium Array, Hash_Table, Prefix_Sum 29 22.22 1673 Find the Most Competitive Subsequence Medium Array, Greedy, Stack, Monotonic_Stack 7 96.82 1672 Richest Customer Wealth Easy Array, Matrix, Programming_Skills_I_Day_6_Array 0 100.00 1671 Minimum Number of Removals to Make Mountain Array Hard Array, Dynamic_Programming, Greedy, Binary_Search 19 81.23 1670 Design Front Middle Back Queue Medium Array, Design, Linked_List, Queue, Data_Stream 5 100.00 1669 Merge In Between Linked Lists Medium Linked_List 2 76.51 1668 Maximum Repeating Substring Easy String, String_Matching 1 93.15 1667 Fix Names in a Table Easy Database, SQL_I_Day_3_String_Processing_Functions 559 80.29 1665 Minimum Initial Energy to Finish Tasks Hard Array, Sorting, Greedy 30 81.16 1664 Ways to Make a Fair Array Medium Array, Dynamic_Programming 11 71.76 1663 Smallest String With A Given Numeric Value Medium String, Greedy 22 75.05 1662 Check If Two String Arrays are Equivalent Easy Array, String 0 100.00 1659 Maximize Grid Happiness Hard Dynamic_Programming, Bit_Manipulation, Bitmask, Memoization 95 75.00 1658 Minimum Operations to Reduce X to Zero Medium Array, Hash_Table, Binary_Search, Prefix_Sum, Sliding_Window 4 98.95 1657 Determine if Two Strings Are Close Medium String, Hash_Table, Sorting 12 97.58 1656 Design an Ordered Stream Easy Array, Hash_Table, Design, Data_Stream 95 74.07 1655 Distribute Repeating Integers Hard Array, Dynamic_Programming, Bit_Manipulation, Backtracking, Bitmask 7 94.23 1654 Minimum Jumps to Reach Home Medium Array, Dynamic_Programming, Breadth_First_Search, Graph_Theory_I_Day_11_Breadth_First_Search 6 99.87 1653 Minimum Deletions to Make String Balanced Medium String, Dynamic_Programming, Stack 26 90.44 1652 Defuse the Bomb Easy Array 0 100.00 1649 Create Sorted Array through Instructions Hard Array, Binary_Search, Ordered_Set, Divide_and_Conquer, Segment_Tree, Binary_Indexed_Tree, Merge_Sort 35 100.00 1648 Sell Diminishing-Valued Colored Balls Medium Array, Math, Sorting, Greedy, Binary_Search, Heap_Priority_Queue, Binary_Search_II_Day_19 27 80.64 1647 Minimum Deletions to Make Character Frequencies Unique Medium String, Sorting, Greedy 8 100.00 1646 Get Maximum in Generated Array Easy Array, Dynamic_Programming, Simulation 0 100.00 1643 Kth Smallest Instructions Hard Array, Dynamic_Programming, Math, Combinatorics 1 100.00 1642 Furthest Building You Can Reach Medium Array, Greedy, Heap_Priority_Queue 13 98.96 1641 Count Sorted Vowel Strings Medium Dynamic_Programming 0 100.00 1640 Check Array Formation Through Concatenation Easy Array, Hash_Table 1 87.62 1639 Number of Ways to Form a Target String Given a Dictionary Hard Array, String, Dynamic_Programming 50 95.33 1638 Count Substrings That Differ by One Character Medium String, Hash_Table, Dynamic_Programming 5 76.39 1637 Widest Vertical Area Between Two Points Containing No Points Medium Array, Sorting 17 74.19 1636 Sort Array by Increasing Frequency Easy Array, Hash_Table, Sorting 7 75.30 1632 Rank Transform of a Matrix Hard Array, Greedy, Matrix, Graph, Union_Find, Topological_Sort 65 100.00 1631 Path With Minimum Effort Medium Array, Depth_First_Search, Breadth_First_Search, Binary_Search, Matrix, Heap_Priority_Queue, Union_Find 75 60.52 1630 Arithmetic Subarrays Medium Array, Sorting, Programming_Skills_II_Day_9 8 93.62 1629 Slowest Key Easy Array, String 4 14.60 1627 Graph Connectivity With Threshold Hard Array, Math, Union_Find 7 98.45 1626 Best Team With No Conflicts Medium Array, Dynamic_Programming, Sorting 38 92.31 1625 Lexicographically Smallest String After Applying Operations Medium String, Breadth_First_Search 91 91.80 1624 Largest Substring Between Two Equal Characters Easy String, Hash_Table 1 85.13 1622 Fancy Sequence Hard Math, Design, Segment_Tree 40 96.55 1621 Number of Sets of K Non-Overlapping Line Segments Medium Dynamic_Programming, Math 16 94.74 1620 Coordinate With Maximum Network Quality Medium Array, Enumeration 58 68.75 1619 Mean of Array After Removing Some Elements Easy Array, Sorting 2 99.81 1617 Count Subtrees With Max Distance Between Cities Hard Dynamic_Programming, Tree, Bit_Manipulation, Bitmask, Enumeration 52 78.95 1616 Split Two Strings to Make Palindrome Medium String, Greedy, Two_Pointers 4 89.77 1615 Maximal Network Rank Medium Graph, Graph_Theory_I_Day_14_Graph_Theory 3 97.34 1614 Maximum Nesting Depth of the Parentheses Easy String, Stack 1 80.44 1611 Minimum One Bit Operations to Make Integers Zero Hard Dynamic_Programming, Bit_Manipulation, Memoization 1 88.24 1610 Maximum Number of Visible Points Hard Array, Math, Sorting, Sliding_Window, Geometry 122 97.44 1609 Even Odd Tree Medium Breadth_First_Search, Tree, Binary_Tree 8 98.81 1608 Special Array With X Elements Greater Than or Equal X Easy Array, Sorting, Binary_Search, Binary_Search_I_Day_7 2 61.14 1606 Find Servers That Handled Most Number of Requests Hard Array, Greedy, Heap_Priority_Queue, Ordered_Set 118 98.21 1605 Find Valid Matrix Given Row and Column Sums Medium Array, Greedy, Matrix 2 98.45 1604 Alert Using Same Key-Card Three or More Times in a One Hour Period Medium Array, String, Hash_Table, Sorting 77 95.79 1603 Design Parking System Easy Design, Simulation, Counting, Programming_Skills_I_Day_12_Class_and_Object 8 76.16 1601 Maximum Number of Achievable Transfer Requests Hard Array, Bit_Manipulation, Backtracking, Enumeration 26 84.02 1600 Throne Inheritance Medium Hash_Table, Depth_First_Search, Tree, Design 267 90.38 1599 Maximum Profit of Operating a Centennial Wheel Medium Array, Simulation 4 95.65 1598 Crawler Log Folder Easy Array, String, Stack 0 100.00 1595 Minimum Cost to Connect Two Groups of Points Hard Array, Dynamic_Programming, Matrix, Bit_Manipulation, Bitmask 74 64.83 1594 Maximum Non Negative Product in a Matrix Medium Array, Dynamic_Programming, Matrix 1 100.00 1593 Split a String Into the Max Number of Unique Substrings Medium String, Hash_Table, Backtracking 8 95.81 1592 Rearrange Spaces Between Words Easy String 3 67.74 1591 Strange Printer II Hard Array, Matrix, Graph, Topological_Sort 12 90.00 1590 Make Sum Divisible by P Medium Array, Hash_Table, Prefix_Sum 56 62.20 1589 Maximum Sum Obtained of Any Permutation Medium Array, Sorting, Greedy, Prefix_Sum 25 92.45 1588 Sum of All Odd Length Subarrays Easy Array, Math, Prefix_Sum, Programming_Skills_I_Day_6_Array 0 100.00 1587 Bank Account Summary II Easy Database, SQL_I_Day_10_Where 630 60.32 1585 Check If String Is Transformable With Substring Sort Operations Hard String, Sorting, Greedy 20 97.22 1584 Min Cost to Connect All Points Medium Array, Union_Find, Minimum_Spanning_Tree 134 87.37 1583 Count Unhappy Friends Medium Array, Simulation 3 93.13 1582 Special Positions in a Binary Matrix Easy Array, Matrix 2 82.12 1581 Customer Who Visited but Did Not Make Any Transactions Easy Database, SQL_I_Day_5_Union 1039 76.99 1579 Remove Max Number of Edges to Keep Graph Fully Traversable Hard Graph, Union_Find 30 66.23 1578 Minimum Time to Make Rope Colorful Medium Array, String, Dynamic_Programming, Greedy 4 100.00 1577 Number of Ways Where Square of Number Is Equal to Product of Two Numbers Medium Array, Hash_Table, Math, Two_Pointers 20 86.27 1576 Replace All ?'s to Avoid Consecutive Repeating Characters Easy String 2 82.74 1575 Count All Possible Routes Hard Array, Dynamic_Programming, Memoization 111 72.26 1574 Shortest Subarray to be Removed to Make Array Sorted Medium Array, Binary_Search, Two_Pointers, Stack, Monotonic_Stack, Binary_Search_II_Day_14 2 84.97 1573 Number of Ways to Split a String Medium String, Math 9 82.09 1572 Matrix Diagonal Sum Easy Array, Matrix, Programming_Skills_I_Day_7_Array 3 10.25 1569 Number of Ways to Reorder Array to Get Same BST Hard Array, Dynamic_Programming, Math, Tree, Binary_Tree, Union_Find, Binary_Search_Tree, Divide_and_Conquer, Memoization, Combinatorics 21 97.44 1568 Minimum Number of Days to Disconnect Island Hard Array, Depth_First_Search, Breadth_First_Search, Matrix, Strongly_Connected_Component 1 100.00 1567 Maximum Length of Subarray With Positive Product Medium Array, Dynamic_Programming, Greedy, Dynamic_Programming_I_Day_6 4 80.86 1566 Detect Pattern of Length M Repeated K or More Times Easy Array, Enumeration 1 49.25 1563 Stone Game V Hard Array, Dynamic_Programming, Math, Game_Theory 36 95.56 1562 Find Latest Group of Size M Medium Array, Binary_Search, Simulation, Binary_Search_II_Day_19 8 90.00 1561 Maximum Number of Coins You Can Get Medium Array, Math, Sorting, Greedy, Game_Theory 34 69.29 1560 Most Visited Sector in a Circular Track Easy Array, Simulation 1 88.89 1559 Detect Cycles in 2D Grid Medium Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find 22 82.51 1558 Minimum Numbers of Function Calls to Make Target Array Medium Array, Greedy 42 69.17 1557 Minimum Number of Vertices to Reach All Nodes Medium Graph, Data_Structure_II_Day_19_Graph, Graph_Theory_I_Day_13_Graph_Theory 8 99.94 1556 Thousand Separator Easy String 1 57.92 1553 Minimum Number of Days to Eat N Oranges Hard Dynamic_Programming, Memoization 5 91.90 1552 Magnetic Force Between Two Balls Medium Array, Sorting, Binary_Search, Binary_Search_II_Day_4 39 99.65 1551 Minimum Operations to Make Array Equal Medium Math 0 100.00 1550 Three Consecutive Odds Easy Array 0 100.00 1547 Minimum Cost to Cut a Stick Hard Array, Dynamic_Programming 6 100.00 1546 Maximum Number of Non-Overlapping Subarrays With Sum Equals Target Medium Array, Hash_Table, Greedy, Prefix_Sum 56 71.58 1545 Find Kth Bit in Nth Binary String Medium String, Recursion 0 100.00 1544 Make The String Great Easy String, Stack 6 50.00 1542 Find Longest Awesome Substring Hard String, Hash_Table, Bit_Manipulation 12 84.16 1541 Minimum Insertions to Balance a Parentheses String Medium String, Greedy, Stack 12 85.50 1540 Can Convert String in K Moves Medium String, Hash_Table 10 100.00 1539 Kth Missing Positive Number Easy Array, Binary_Search, Binary_Search_I_Day_6 0 100.00 1537 Get the Maximum Score Hard Array, Dynamic_Programming, Greedy, Two_Pointers 6 58.14 1536 Minimum Swaps to Arrange a Binary Grid Medium Array, Greedy, Matrix 1 100.00 1535 Find the Winner of an Array Game Medium Array, Simulation 1 86.99 1534 Count Good Triplets Easy Array, Enumeration 14 82.96 1531 String Compression II Hard String, Dynamic_Programming 34 83.91 1530 Number of Good Leaf Nodes Pairs Medium Depth_First_Search, Tree, Binary_Tree 3 94.18 1529 Minimum Suffix Flips Medium String, Greedy 6 89.67 1528 Shuffle String Easy Array, String 2 54.77 1527 Patients With a Condition Easy Database, SQL_I_Day_3_String_Processing_Functions 308 66.93 1526 Minimum Number of Increments on Subarrays to Form a Target Array Hard Array, Dynamic_Programming, Greedy, Stack, Monotonic_Stack 4 70.36 1525 Number of Good Ways to Split a String Medium String, Dynamic_Programming, Bit_Manipulation 19 69.66 1524 Number of Sub-arrays With Odd Sum Medium Array, Dynamic_Programming, Math, Prefix_Sum 9 90.24 1523 Count Odd Numbers in an Interval Range Easy Math, Programming_Skills_I_Day_1_Basic_Data_Type 0 100.00 1521 Find a Value of a Mysterious Function Closest to Target Hard Array, Binary_Search, Bit_Manipulation, Segment_Tree 9 100.00 1520 Maximum Number of Non-Overlapping Substrings Hard String, Greedy 15 92.93 1519 Number of Nodes in the Sub-Tree With the Same Label Medium Hash_Table, Depth_First_Search, Breadth_First_Search, Tree, Counting 60 98.13 1518 Water Bottles Easy Math, Simulation 0 100.00 1515 Best Position for a Service Centre Hard Math, Geometry, Randomized 6 87.14 1514 Path with Maximum Probability Medium Heap_Priority_Queue, Graph, Shortest_Path 31 93.10 1513 Number of Substrings With Only 1s Medium String, Math 3 97.83 1512 Number of Good Pairs Easy Array, Hash_Table, Math, Counting 1 84.97 1510 Stone Game IV Hard Dynamic_Programming, Math, Game_Theory 12 85.75 1509 Minimum Difference Between Largest and Smallest Value in Three Moves Medium Array, Sorting, Greedy 19 76.94 1508 Range Sum of Sorted Subarray Sums Medium Array, Sorting, Binary_Search, Two_Pointers, Binary_Search_II_Day_14 60 93.84 1507 Reformat Date Easy String 1 98.73 1505 Minimum Possible Integer After at Most K Adjacent Swaps On Digits Hard String, Greedy, Segment_Tree, Binary_Indexed_Tree 12 96.77 1504 Count Submatrices With All Ones Medium Array, Dynamic_Programming, Matrix, Stack, Monotonic_Stack 9 85.86 1503 Last Moment Before All Ants Fall Out of a Plank Medium Array, Simulation, Brainteaser 1 81.72 1502 Can Make Arithmetic Progression From Sequence Easy Array, Sorting, Programming_Skills_I_Day_4_Loop 4 14.13 1499 Max Value of Equation Hard Array, Heap_Priority_Queue, Sliding_Window, Queue, Monotonic_Queue 7 98.61 1498 Number of Subsequences That Satisfy the Given Sum Condition Medium Array, Sorting, Binary_Search, Two_Pointers, Binary_Search_II_Day_15 27 99.13 1497 Check If Array Pairs Are Divisible by k Medium Array, Hash_Table, Counting 7 97.44 1496 Path Crossing Easy String, Hash_Table 1 97.41 1494 Parallel Courses II Hard Dynamic_Programming, Bit_Manipulation, Graph, Bitmask 325 42.24 1493 Longest Subarray of 1's After Deleting One Element Medium Dynamic_Programming, Math, Sliding_Window 2 87.25 1492 The kth Factor of n Medium Math 1 83.94 1491 Average Salary Excluding the Minimum and Maximum Salary Easy Array, Sorting, Programming_Skills_I_Day_1_Basic_Data_Type 0 100.00 1489 Find Critical and Pseudo-Critical Edges in Minimum Spanning Tree Hard Sorting, Graph, Union_Find, Minimum_Spanning_Tree, Strongly_Connected_Component 17 100.00 1488 Avoid Flood in The City Medium Array, Hash_Table, Greedy, Binary_Search, Heap_Priority_Queue, Binary_Search_II_Day_18 82 75.08 1487 Making File Names Unique Medium Array, String, Hash_Table 36 98.46 1486 XOR Operation in an Array Easy Math, Bit_Manipulation 0 100.00 1484 Group Sold Products By The Date Easy LeetCode_Curated_SQL_70, Database, SQL_I_Day_3_String_Processing_Functions 395 77.20 1483 Kth Ancestor of a Tree Node Hard Dynamic_Programming, Depth_First_Search, Breadth_First_Search, Tree, Binary_Search, Design 60 93.28 1482 Minimum Number of Days to Make m Bouquets Medium Array, Binary_Search, Binary_Search_II_Day_7 25 69.18 1481 Least Number of Unique Integers after K Removals Medium Array, Hash_Table, Sorting, Greedy, Counting 62 85.33 1480 Running Sum of 1d Array Easy Array, Prefix_Sum, Level_1_Day_1_Prefix_Sum 0 100.00 1478 Allocate Mailboxes Hard Array, Dynamic_Programming, Math, Sorting 12 78.87 1477 Find Two Non-overlapping Sub-arrays Each With Target Sum Medium Array, Hash_Table, Dynamic_Programming, Binary_Search, Sliding_Window 8 89.43 1476 Subrectangle Queries Medium Array, Matrix, Design 20 97.61 1475 Final Prices With a Special Discount in a Shop Easy Array, Stack, Monotonic_Stack 2 80.33 1473 Paint House III Hard Array, Dynamic_Programming 26 89.13 1472 Design Browser History Medium Array, Stack, Design, Linked_List, Data_Stream, Doubly_Linked_List 76 82.33 1471 The k Strongest Values in an Array Medium Array, Sorting, Two_Pointers 37 88.20 1470 Shuffle the Array Easy Array 1 51.62 1467 Probability of a Two Boxes Having The Same Number of Distinct Balls Hard Dynamic_Programming, Math, Backtracking, Combinatorics, Probability_and_Statistics 1 100.00 1466 Reorder Routes to Make All Paths Lead to the City Zero Medium Depth_First_Search, Breadth_First_Search, Graph, Graph_Theory_I_Day_10_Standard_Traversal 39 97.71 1465 Maximum Area of a Piece of Cake After Horizontal and Vertical Cuts Medium Array, Sorting, Greedy 21 35.40 1464 Maximum Product of Two Elements in an Array Easy Array, Sorting, Heap_Priority_Queue 1 90.39 1463 Cherry Pickup II Hard Array, Dynamic_Programming, Matrix 10 99.58 1462 Course Schedule IV Medium Depth_First_Search, Breadth_First_Search, Graph, Topological_Sort 10 100.00 1461 Check If a String Contains All Binary Codes of Size K Medium String, Hash_Table, Bit_Manipulation, Hash_Function, Rolling_Hash 169 52.07 1460 Make Two Arrays Equal by Reversing Sub-arrays Easy Array, Hash_Table, Sorting 4 74.61 1458 Max Dot Product of Two Subsequences Hard Array, Dynamic_Programming 6 98.36 1457 Pseudo-Palindromic Paths in a Binary Tree Medium Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Bit_Manipulation 35 43.73 1456 Maximum Number of Vowels in a Substring of Given Length Medium String, Sliding_Window 19 53.73 1455 Check If a Word Occurs As a Prefix of Any Word in a Sentence Easy String, String_Matching 1 32.08 1453 Maximum Number of Darts Inside of a Circular Dartboard Hard Array, Math, Geometry 22 100.00 1452 People Whose List of Favorite Companies Is Not a Subset of Another List Medium Array, String, Hash_Table 117 78.71 1451 Rearrange Words in a Sentence Medium String, Sorting 21 89.94 1450 Number of Students Doing Homework at a Given Time Easy Array 0 100.00 1449 Form Largest Integer With Digits That Add up to Target Hard Array, Dynamic_Programming 8 77.46 1448 Count Good Nodes in Binary Tree Medium Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree 2 99.63 1447 Simplified Fractions Medium String, Math, Number_Theory 33 69.60 1446 Consecutive Characters Easy String 3 30.50 1444 Number of Ways of Cutting a Pizza Hard Array, Dynamic_Programming, Matrix, Memoization 14 46.03 1443 Minimum Time to Collect All Apples in a Tree Medium Hash_Table, Depth_First_Search, Breadth_First_Search, Tree 75 57.75 1442 Count Triplets That Can Form Two Arrays of Equal XOR Medium Array, Hash_Table, Math, Bit_Manipulation, Prefix_Sum 2 79.80 1441 Build an Array With Stack Operations Easy Array, Stack, Simulation 1 38.47 1439 Find the Kth Smallest Sum of a Matrix With Sorted Rows Hard Array, Binary_Search, Matrix, Heap_Priority_Queue 40 75.79 1438 Longest Continuous Subarray With Absolute Diff Less Than or Equal to Limit Medium Array, Heap_Priority_Queue, Sliding_Window, Ordered_Set, Queue, Monotonic_Queue 38 81.86 1437 Check If All 1's Are at Least Length K Places Away Easy Array 2 73.75 1436 Destination City Easy String, Hash_Table 3 81.47 1434 Number of Ways to Wear Different Hats to Each Other Hard Array, Dynamic_Programming, Bit_Manipulation, Bitmask 31 77.92 1433 Check If a String Can Break Another String Medium String, Sorting, Greedy 9 77.89 1432 Max Difference You Can Get From Changing an Integer Medium Math, Greedy 1 97.22 1431 Kids With the Greatest Number of Candies Easy Array 1 84.43 1425 Constrained Subsequence Sum Hard Array, Dynamic_Programming, Heap_Priority_Queue, Sliding_Window, Queue, Monotonic_Queue 69 30.52 1424 Diagonal Traverse II Medium Array, Sorting, Heap_Priority_Queue 39 85.56 1423 Maximum Points You Can Obtain from Cards Medium Array, Prefix_Sum, Sliding_Window 2 94.06 1422 Maximum Score After Splitting a String Easy String 1 96.45 1420 Build Array Where You Can Find The Maximum Exactly K Comparisons Hard Dynamic_Programming 22 86.32 1419 Minimum Number of Frogs Croaking Medium String, Counting 19 32.16 1418 Display Table of Food Orders in a Restaurant Medium Array, String, Hash_Table, Sorting, Ordered_Set 42 77.01 1417 Reformat The String Easy String 4 88.39 1416 Restore The Array Hard String, Dynamic_Programming 34 100.00 1415 The k-th Lexicographical String of All Happy Strings of Length n Medium String, Backtracking 2 90.55 1414 Find the Minimum Number of Fibonacci Numbers Whose Sum Is K Medium Greedy 2 67.22 1413 Minimum Value to Get Positive Step by Step Sum Easy Array, Prefix_Sum 0 100.00 1411 Number of Ways to Paint N × 3 Grid Hard Dynamic_Programming 14 34.91 1410 HTML Entity Parser Medium String, Hash_Table 19 98.92 1409 Queries on a Permutation With Key Medium Array, Simulation, Binary_Indexed_Tree 15 38.43 1408 String Matching in an Array Easy String, String_Matching 8 24.88 1407 Top Travellers Easy LeetCode_Curated_SQL_70, Database, SQL_I_Day_9_Control_of_Flow 682 70.16 1406 Stone Game III Hard Array, Dynamic_Programming, Math, Game_Theory 14 82.02 1405 Longest Happy String Medium String, Greedy, Heap_Priority_Queue 0 100.00 1404 Number of Steps to Reduce a Number in Binary Representation to One Medium String, Bit_Manipulation 1 62.90 1403 Minimum Subsequence in Non-Increasing Order Easy Array, Sorting, Greedy 4 79.60 1402 Reducing Dishes Hard Array, Dynamic_Programming, Sorting, Greedy 3 66.20 1401 Circle and Rectangle Overlapping Medium Math, Geometry 0 100.00 1400 Construct K Palindrome Strings Medium String, Hash_Table, Greedy, Counting 5 94.62 1399 Count Largest Group Easy Hash_Table, Math 3 98.21 1397 Find All Good Strings Hard String, Dynamic_Programming, String_Matching 85 41.25 1396 Design Underground System Medium String, Hash_Table, Design 89 89.64 1395 Count Number of Teams Medium Array, Dynamic_Programming, Binary_Indexed_Tree 18 91.75 1394 Find Lucky Integer in an Array Easy Array, Hash_Table, Counting 2 82.56 1393 Capital Gain/Loss Medium LeetCode_Curated_SQL_70, Database, SQL_I_Day_9_Control_of_Flow 457 79.39 1392 Longest Happy Prefix Hard String, Hash_Function, String_Matching, Rolling_Hash 39 28.37 1391 Check if There is a Valid Path in a Grid Medium Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find 14 85.37 1390 Four Divisors Medium Array, Math 13 97.25 1389 Create Target Array in the Given Order Easy Array, Simulation 0 100.00 1388 Pizza With 3n Slices Hard Array, Dynamic_Programming, Greedy, Heap_Priority_Queue 5 93.33 1387 Sort Integers by The Power Value Medium Dynamic_Programming, Sorting, Memoization 52 87.20 1386 Cinema Seat Allocation Medium Array, Hash_Table, Greedy, Bit_Manipulation 32 69.41 1385 Find the Distance Value Between Two Arrays Easy Array, Sorting, Binary_Search, Two_Pointers, Binary_Search_I_Day_3 5 65.78 1383 Maximum Performance of a Team Hard Array, Sorting, Greedy, Heap_Priority_Queue 66 66.03 1382 Balance a Binary Search Tree Medium Depth_First_Search, Greedy, Tree, Binary_Tree, Binary_Search_Tree, Divide_and_Conquer 5 65.24 1381 Design a Stack With Increment Operation Medium Array, Stack, Design 8 62.23 1380 Lucky Numbers in a Matrix Easy Array, Matrix 2 82.40 1379 Find a Corresponding Node of a Binary Tree in a Clone of That Tree Easy Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree 2 77.89 1377 Frog Position After T Seconds Hard Depth_First_Search, Breadth_First_Search, Tree, Graph 6 81.30 1376 Time Needed to Inform All Employees Medium Depth_First_Search, Breadth_First_Search, Tree, Programming_Skills_II_Day_11, Graph_Theory_I_Day_9_Standard_Traversal 225 22.36 1375 Number of Times Binary String Is Prefix-Aligned Medium Array 2 89.02 1374 Generate a String With Characters That Have Odd Counts Easy String 1 90.52 1373 Maximum Sum BST in Binary Tree Hard Dynamic_Programming, Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree 15 47.56 1372 Longest ZigZag Path in a Binary Tree Medium Dynamic_Programming, Depth_First_Search, Tree, Binary_Tree 9 64.47 1371 Find the Longest Substring Containing Vowels in Even Counts Medium String, Hash_Table, Bit_Manipulation, Prefix_Sum 25 80.38 1370 Increasing Decreasing String Easy String, Hash_Table, Counting 4 80.41 1368 Minimum Cost to Make at Least One Valid Path in a Grid Hard Array, Breadth_First_Search, Matrix, Heap_Priority_Queue, Graph, Shortest_Path 8 99.38 1367 Linked List in Binary Tree Medium Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Linked_List, Programming_Skills_II_Day_4 2 61.23 1366 Rank Teams by Votes Medium Array, String, Hash_Table, Sorting, Counting 5 95.68 1365 How Many Numbers Are Smaller Than the Current Number Easy Array, Hash_Table, Sorting, Counting 1 99.78 1363 Largest Multiple of Three Hard Array, Dynamic_Programming, Greedy 5 84.67 1362 Closest Divisors Medium Math 8 84.91 1361 Validate Binary Tree Nodes Medium Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Graph, Union_Find 8 69.78 1360 Number of Days Between Two Dates Easy String, Math 2 78.82 1359 Count All Valid Pickup and Delivery Options Hard Dynamic_Programming, Math, Combinatorics 0 100.00 1358 Number of Substrings Containing All Three Characters Medium String, Hash_Table, Sliding_Window 15 53.82 1357 Apply Discount Every n Orders Medium Array, Hash_Table, Design 174 58.82 1356 Sort Integers by The Number of 1 Bits Easy Array, Sorting, Bit_Manipulation, Counting, Programming_Skills_I_Day_11_Containers_and_Libraries 10 65.50 1354 Construct Target Array With Multiple Sums Hard Array, Heap_Priority_Queue 2 100.00 1353 Maximum Number of Events That Can Be Attended Medium Array, Greedy, Heap_Priority_Queue 70 21.66 1352 Product of the Last K Numbers Medium Array, Math, Design, Queue, Data_Stream 24 60.43 1351 Count Negative Numbers in a Sorted Matrix Easy Array, Binary_Search, Matrix, Binary_Search_I_Day_8 1 49.66 1349 Maximum Students Taking Exam Hard Array, Dynamic_Programming, Matrix, Bit_Manipulation, Bitmask 4 76.98 1348 Tweet Counts Per Frequency Medium Hash_Table, Sorting, Binary_Search, Design, Ordered_Set 86 99.44 1347 Minimum Number of Steps to Make Two Strings Anagram Medium String, Hash_Table, Counting 13 76.34 1346 Check If N and Its Double Exist Easy Array, Hash_Table, Sorting, Binary_Search, Two_Pointers, Binary_Search_I_Day_9 1 99.64 1345 Jump Game IV Hard Array, Hash_Table, Breadth_First_Search 65 89.91 1344 Angle Between Hands of a Clock Medium Math 0 100.00 1343 Number of Sub-arrays of Size K and Average Greater than or Equal to Threshold Medium Array, Sliding_Window 5 46.57 1342 Number of Steps to Reduce a Number to Zero Easy Math, Bit_Manipulation 1 58.49 1340 Jump Game V Hard Array, Dynamic_Programming, Sorting 13 71.33 1339 Maximum Product of Splitted Binary Tree Medium Depth_First_Search, Tree, Binary_Tree 11 83.43 1338 Reduce Array Size to The Half Medium Array, Hash_Table, Sorting, Greedy, Heap_Priority_Queue 61 73.82 1337 The K Weakest Rows in a Matrix Easy Array, Sorting, Binary_Search, Matrix, Heap_Priority_Queue, Binary_Search_I_Day_9 1 99.77 1335 Minimum Difficulty of a Job Schedule Hard Array, Dynamic_Programming 11 79.28 1334 Find the City With the Smallest Number of Neighbors at a Threshold Distance Medium Dynamic_Programming, Graph, Shortest_Path 21 49.75 1333 Filter Restaurants by Vegan-Friendly, Price and Distance Medium Array, Sorting 10 55.43 1332 Remove Palindromic Subsequences Easy String, Two_Pointers 0 100.00 1331 Rank Transform of an Array Easy Array, Hash_Table, Sorting 22 98.50 1330 Reverse Subarray To Maximize Array Value Hard Array, Math, Greedy 9 88.00 1329 Sort the Matrix Diagonally Medium Array, Sorting, Matrix 15 26.03 1328 Break a Palindrome Medium String, Greedy 0 100.00 1326 Minimum Number of Taps to Open to Water a Garden Hard Array, Dynamic_Programming, Greedy 3 90.04 1325 Delete Leaves With a Given Value Medium Depth_First_Search, Tree, Binary_Tree 2 33.61 1324 Print Words Vertically Medium Array, String, Simulation 1 90.59 1323 Maximum 69 Number Easy Math, Greedy 3 32.03 1320 Minimum Distance to Type a Word Using Two Fingers Hard String, Dynamic_Programming 16 82.29 1319 Number of Operations to Make Network Connected Medium Depth_First_Search, Breadth_First_Search, Graph, Union_Find, Graph_Theory_I_Day_8_Standard_Traversal 9 67.64 1318 Minimum Flips to Make a OR b Equal to c Medium Bit_Manipulation 0 100.00 1317 Convert Integer to the Sum of Two No-Zero Integers Easy Math 1 84.36 1316 Distinct Echo Substrings Hard String, Dynamic_Programming, Sliding_Window, Trie, Hash_Function, Rolling_Hash 165 93.15 1315 Sum of Nodes with Even-Valued Grandparent Medium Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree 2 78.61 1314 Matrix Block Sum Medium Array, Matrix, Prefix_Sum, Dynamic_Programming_I_Day_14 5 67.46 1313 Decompress Run-Length Encoded List Easy Array 1 98.11 1312 Minimum Insertion Steps to Make a String Palindrome Hard String, Dynamic_Programming 25 85.70 1311 Get Watched Videos by Your Friends Medium Array, Hash_Table, Sorting, Breadth_First_Search 39 73.81 1310 XOR Queries of a Subarray Medium Array, Bit_Manipulation, Prefix_Sum 3 68.91 1309 Decrypt String from Alphabet to Integer Mapping Easy String, Programming_Skills_I_Day_9_String 6 28.25 1307 Verbal Arithmetic Puzzle Hard Array, String, Math, Backtracking 6 95.74 1306 Jump Game III Medium Array, Depth_First_Search, Breadth_First_Search, Graph_Theory_I_Day_11_Breadth_First_Search 2 96.23 1305 All Elements in Two Binary Search Trees Medium Sorting, Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree 25 63.82 1304 Find N Unique Integers Sum up to Zero Easy Array, Math 0 100.00 1302 Deepest Leaves Sum Medium Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree 5 59.50 1301 Number of Paths with Max Score Hard Array, Dynamic_Programming, Matrix 14 72.31 1300 Sum of Mutated Array Closest to Target Medium Array, Sorting, Binary_Search, Binary_Search_II_Day_16 7 33.33 1299 Replace Elements with Greatest Element on Right Side Easy Array 1 99.82 1298 Maximum Candies You Can Get from Boxes Hard Array, Breadth_First_Search 3 100.00 1297 Maximum Number of Occurrences of a Substring Medium String, Hash_Table, Sliding_Window 42 90.85 1296 Divide Array in Sets of K Consecutive Numbers Medium Array, Hash_Table, Sorting, Greedy 39 97.80 1295 Find Numbers with Even Number of Digits Easy Array 2 58.23 1293 Shortest Path in a Grid with Obstacles Elimination Hard Array, Breadth_First_Search, Matrix 35 63.17 1292 Maximum Side Length of a Square with Sum Less than or Equal to Threshold Medium Array, Binary_Search, Matrix, Prefix_Sum, Binary_Search_II_Day_15 23 32.97 1291 Sequential Digits Medium Enumeration 0 100.00 1290 Convert Binary Number in a Linked List to Integer Easy Math, Linked_List, Programming_Skills_I_Day_10_Linked_List_and_Tree 0 100.00 1289 Minimum Falling Path Sum II Hard Array, Dynamic_Programming, Matrix 2 99.45 1288 Remove Covered Intervals Medium Array, Sorting 6 78.87 1287 Element Appearing More Than 25% In Sorted Array Easy Array 0 100.00 1286 Iterator for Combination Medium String, Design, Backtracking, Iterator 10 95.00 1284 Minimum Number of Flips to Convert Binary Matrix to Zero Matrix Hard Array, Breadth_First_Search, Matrix, Bit_Manipulation 2 89.29 1283 Find the Smallest Divisor Given a Threshold Medium Array, Binary_Search, Binary_Search_II_Day_5 9 95.49 1282 Group the People Given the Group Size They Belong To Medium Array, Hash_Table 6 79.04 1281 Subtract the Product and Sum of Digits of an Integer Easy Math, Programming_Skills_I_Day_2_Operator 0 100.00 1278 Palindrome Partitioning III Hard String, Dynamic_Programming 4 89.93 1277 Count Square Submatrices with All Ones Medium Array, Dynamic_Programming, Matrix 5 95.33 1276 Number of Burgers with No Waste of Ingredients Medium Math 2 87.88 1275 Find Winner on a Tic Tac Toe Game Easy Array, Hash_Table, Matrix, Simulation 0 100.00 1269 Number of Ways to Stay in the Same Place After Some Steps Hard Dynamic_Programming 12 89.11 1268 Search Suggestions System Medium Array, String 28 78.06 1267 Count Servers that Communicate Medium Array, Depth_First_Search, Breadth_First_Search, Matrix, Counting, Union_Find 5 41.00 1266 Minimum Time Visiting All Points Easy Array, Math, Geometry 1 80.97 1263 Minimum Moves to Move a Box to Their Target Location Hard Array, Breadth_First_Search, Matrix, Heap_Priority_Queue 16 76.00 1262 Greatest Sum Divisible by Three Medium Array, Dynamic_Programming, Greedy 5 95.82 1261 Find Elements in a Contaminated Binary Tree Medium Hash_Table, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Design 24 84.00 1260 Shift 2D Grid Easy Array, Matrix, Simulation 17 14.82 1255 Maximum Score Words Formed by Letters Hard Array, String, Dynamic_Programming, Bit_Manipulation, Backtracking, Bitmask 1 98.36 1254 Number of Closed Islands Medium Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find, Graph_Theory_I_Day_2_Matrix_Related_Problems 3 55.59 1253 Reconstruct a 2-Row Binary Matrix Medium Array, Greedy, Matrix 18 57.27 1252 Cells with Odd Values in a Matrix Easy Array, Math, Simulation 1 87.47 1250 Check If It Is a Good Array Hard Array, Math, Number_Theory 4 58.82 1249 Minimum Remove to Make Valid Parentheses Medium String, Stack, Data_Structure_II_Day_14_Stack_Queue 13 94.62 1248 Count Number of Nice Subarrays Medium Array, Hash_Table, Math, Sliding_Window 14 69.78 1247 Minimum Swaps to Make Strings Equal Medium String, Math, Greedy 1 79.83 1240 Tiling a Rectangle with the Fewest Squares Hard Dynamic_Programming, Backtracking 3 62.18 1239 Maximum Length of a Concatenated String with Unique Characters Medium Array, String, Bit_Manipulation, Backtracking 9 88.28 1238 Circular Permutation in Binary Representation Medium Math, Bit_Manipulation, Backtracking 4 100.00 1237 Find Positive Integer Solution for a Given Equation Medium Math, Binary_Search, Two_Pointers, Interactive 2 79.60 1235 Maximum Profit in Job Scheduling Hard Array, Dynamic_Programming, Sorting, Binary_Search 27 89.19 1234 Replace the Substring for Balanced String Medium String, Sliding_Window 7 89.84 1233 Remove Sub-Folders from the Filesystem Medium Array, String, Trie 32 96.54 1232 Check If It Is a Straight Line Easy Array, Math, Geometry, Programming_Skills_I_Day_5_Function 0 100.00 1227 Airplane Seat Assignment Probability Medium Dynamic_Programming, Math, Brainteaser, Probability_and_Statistics 1 15.63 1226 The Dining Philosophers Medium Concurrency 10 83.56 1224 Maximum Equal Frequency Hard Array, Hash_Table 17 93.59 1223 Dice Roll Simulation Hard Array, Dynamic_Programming 9 90.98 1222 Queens That Can Attack the King Medium Array, Matrix, Simulation 1 89.88 1221 Split a String in Balanced Strings Easy String, Greedy, Counting 1 53.71 1220 Count Vowels Permutation Hard Dynamic_Programming 7 98.50 1219 Path with Maximum Gold Medium Array, Matrix, Backtracking 48 57.00 1218 Longest Arithmetic Subsequence of Given Difference Medium Array, Hash_Table, Dynamic_Programming 11 98.23 1217 Minimum Cost to Move Chips to The Same Position Easy Array, Math, Greedy 0 100.00 1210 Minimum Moves to Reach Target with Rotations Hard Array, Breadth_First_Search, Matrix 29 78.57 1209 Remove All Adjacent Duplicates in String II Medium String, Stack 15 88.34 1208 Get Equal Substrings Within Budget Medium String, Binary_Search, Prefix_Sum, Sliding_Window 7 73.41 1207 Unique Number of Occurrences Easy Array, Hash_Table 2 82.71 1206 Design Skiplist Hard Design, Linked_List 14 96.71 1203 Sort Items by Groups Respecting Dependencies Hard Depth_First_Search, Breadth_First_Search, Graph, Topological_Sort 44 88.89 1202 Smallest String With Swaps Medium String, Hash_Table, Depth_First_Search, Breadth_First_Search, Union_Find 43 86.82 1201 Ugly Number III Medium Math, Binary_Search, Number_Theory, Binary_Search_II_Day_20 0 100.00 1200 Minimum Absolute Difference Easy Array, Sorting 14 98.30 1195 Fizz Buzz Multithreaded Medium Concurrency 8 80.09 1192 Critical Connections in a Network Hard Depth_First_Search, Graph, Biconnected_Component 127 89.39 1191 K-Concatenation Maximum Sum Medium Array, Dynamic_Programming 6 73.85 1190 Reverse Substrings Between Each Pair of Parentheses Medium String, Stack 1 98.26 1189 Maximum Number of Balloons Easy String, Hash_Table, Counting 3 68.13 1187 Make Array Strictly Increasing Hard Array, Dynamic_Programming, Binary_Search 33 95.51 1186 Maximum Subarray Sum with One Deletion Medium Array, Dynamic_Programming 3 94.48 1185 Day of the Week Easy Math 0 100.00 1184 Distance Between Bus Stops Easy Array 0 100.00 1179 Reformat Department Table Easy Database 493 64.80 1178 Number of Valid Words for Each Puzzle Hard Array, String, Hash_Table, Bit_Manipulation, Trie 139 48.41 1177 Can Make Palindrome from Substring Medium String, Hash_Table, Bit_Manipulation, Prefix_Sum 13 93.08 1175 Prime Arrangements Easy Math 0 100.00 1172 Dinner Plate Stacks Hard Hash_Table, Stack, Design, Heap_Priority_Queue 63 96.74 1171 Remove Zero Sum Consecutive Nodes from Linked List Medium Hash_Table, Linked_List 2 90.39 1170 Compare Strings by Frequency of the Smallest Character Medium Array, String, Hash_Table, Sorting, Binary_Search 7 57.89 1169 Invalid Transactions Medium Array, String, Hash_Table, Sorting 11 89.89 1163 Last Substring in Lexicographical Order Hard String, Two_Pointers 12 96.43 1162 As Far from Land as Possible Medium Array, Dynamic_Programming, Breadth_First_Search, Matrix, Graph_Theory_I_Day_4_Matrix_Related_Problems 12 89.17 1161 Maximum Level Sum of a Binary Tree Medium Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree 9 78.65 1160 Find Words That Can Be Formed by Characters Easy Array, String, Hash_Table 53 30.13 1158 Market Analysis I Medium Database, SQL_I_Day_9_Control_of_Flow 1039 77.70 1157 Online Majority Element In Subarray Hard Array, Binary_Search, Design, Segment_Tree, Binary_Indexed_Tree 56 100.00 1156 Swap For Longest Repeated Character Substring Medium String, Sliding_Window 12 47.37 1155 Number of Dice Rolls With Target Sum Medium Dynamic_Programming 17 78.89 1154 Day of the Year Easy String, Math 9 95.40 1148 Article Views I Easy LeetCode_Curated_SQL_70, Database, SQL_I_Day_5_Union 459 44.85 1147 Longest Chunked Palindrome Decomposition Hard String, Dynamic_Programming, Greedy, Two_Pointers, Hash_Function, Rolling_Hash 11 44.95 1146 Snapshot Array Medium Array, Hash_Table, Binary_Search, Design, Binary_Search_II_Day_18 37 87.93 1145 Binary Tree Coloring Game Medium Depth_First_Search, Tree, Binary_Tree 0 100.00 1144 Decrease Elements To Make Array Zigzag Medium Array, Greedy 0 100.00 1143 Longest Common Subsequence Medium Top_100_Liked_Questions, String, Dynamic_Programming, Algorithm_II_Day_17_Dynamic_Programming, Dynamic_Programming_I_Day_19 9 93.92 1141 User Activity for the Past 30 Days I Easy LeetCode_Curated_SQL_70, Database, SQL_I_Day_7_Function 543 29.24 1140 Stone Game II Medium Array, Dynamic_Programming, Math, Game_Theory 12 44.22 1139 Largest 1-Bordered Square Medium Array, Dynamic_Programming, Matrix 8 53.28 1138 Alphabet Board Path Medium String, Hash_Table 1 76.10 1137 N-th Tribonacci Number Easy Dynamic_Programming, Math, Memoization, Dynamic_Programming_I_Day_1 0 100.00 1131 Maximum of Absolute Value Expression Medium Array, Math 8 60.95 1130 Minimum Cost Tree From Leaf Values Medium Dynamic_Programming, Greedy, Stack, Monotonic_Stack 2 82.90 1129 Shortest Path with Alternating Colors Medium Breadth_First_Search, Graph, Graph_Theory_I_Day_10_Standard_Traversal 5 90.28 1128 Number of Equivalent Domino Pairs Easy Array, Hash_Table, Counting 10 69.88 1125 Smallest Sufficient Team Hard Array, Dynamic_Programming, Bit_Manipulation, Bitmask 3 98.82 1124 Longest Well-Performing Interval Medium Array, Hash_Table, Stack, Prefix_Sum, Monotonic_Stack 13 71.38 1123 Lowest Common Ancestor of Deepest Leaves Medium Hash_Table, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree 1 76.02 1122 Relative Sort Array Easy Array, Hash_Table, Sorting, Counting_Sort 0 100.00 1117 Building H2O Medium Concurrency 12 93.81 1116 Print Zero Even Odd Medium Concurrency 5 99.83 1115 Print FooBar Alternately Medium Concurrency 16 90.05 1114 Print in Order Easy Concurrency 16 77.21 1111 Maximum Nesting Depth of Two Valid Parentheses Strings Medium String, Stack 1 99.73 1110 Delete Nodes And Return Forest Medium Depth_First_Search, Tree, Binary_Tree 5 15.90 1109 Corporate Flight Bookings Medium Array, Prefix_Sum 3 87.75 1108 Defanging an IP Address Easy String 0 100.00 1106 Parsing A Boolean Expression Hard String, Stack, Recursion 3 93.78 1105 Filling Bookcase Shelves Medium Array, Dynamic_Programming 4 23.85 1104 Path In Zigzag Labelled Binary Tree Medium Math, Tree, Binary_Tree 1 58.50 1103 Distribute Candies to People Easy Math, Simulation 2 49.07 1096 Brace Expansion II Hard String, Breadth_First_Search, Stack, Backtracking 23 60.36 1095 Find in Mountain Array Hard Array, Binary_Search, Interactive 0 100.00 1094 Car Pooling Medium Array, Sorting, Heap_Priority_Queue, Simulation, Prefix_Sum 1 99.38 1093 Statistics from a Large Sample Medium Math, Two_Pointers, Probability_and_Statistics 1 86.00 1092 Shortest Common Supersequence Hard String, Dynamic_Programming 10 96.12 1091 Shortest Path in Binary Matrix Medium Array, Breadth_First_Search, Matrix, Algorithm_II_Day_8_Breadth_First_Search_Depth_First_Search, Graph_Theory_I_Day_5_Matrix_Related_Problems 22 69.99 1090 Largest Values From Labels Medium Array, Hash_Table, Sorting, Greedy, Counting 14 95.96 1089 Duplicate Zeros Easy Array, Two_Pointers 2 67.91 1084 Sales Analysis III Easy LeetCode_Curated_SQL_70, Database, SQL_I_Day_10_Where 1066 69.71 1081 Smallest Subsequence of Distinct Characters Medium String, Greedy, Stack, Monotonic_Stack 2 97.16 1080 Insufficient Nodes in Root to Leaf Paths Medium Depth_First_Search, Tree, Binary_Tree 1 76.12 1079 Letter Tile Possibilities Medium String, Backtracking 3 86.86 1078 Occurrences After Bigram Easy String 0 100.00 1074 Number of Submatrices That Sum to Target Hard Array, Hash_Table, Matrix, Prefix_Sum 171 68.35 1073 Adding Two Negabinary Numbers Medium Array, Math 1 100.00 1072 Flip Columns For Maximum Number of Equal Rows Medium Array, Hash_Table, Matrix 26 95.71 1071 Greatest Common Divisor of Strings Easy String, Math 1 82.09 1054 Distant Barcodes Medium Array, Hash_Table, Sorting, Greedy, Heap_Priority_Queue, Counting 45 64.21 1053 Previous Permutation With One Swap Medium Array, Greedy 0 100.00 1052 Grumpy Bookstore Owner Medium Array, Sliding_Window 4 70.26 1051 Height Checker Easy Array, Sorting, Counting_Sort 1 94.01 1050 Actors and Directors Who Cooperated At Least Three Times Easy LeetCode_Curated_SQL_70, Database, SQL_I_Day_10_Where 344 76.48 1049 Last Stone Weight II Medium Array, Dynamic_Programming 2 95.98 1048 Longest String Chain Medium Array, String, Hash_Table, Dynamic_Programming, Two_Pointers 23 97.92 1047 Remove All Adjacent Duplicates In String Easy String, Stack 3 99.99 1046 Last Stone Weight Easy Array, Heap_Priority_Queue, Level_1_Day_15_Heap 2 73.81 1044 Longest Duplicate Substring Hard String, Binary_Search, Sliding_Window, Hash_Function, Rolling_Hash, Suffix_Array 447 62.53 1043 Partition Array for Maximum Sum Medium Array, Dynamic_Programming 5 90.43 1042 Flower Planting With No Adjacent Medium Depth_First_Search, Breadth_First_Search, Graph 19 89.02 1041 Robot Bounded In Circle Medium String, Math, Simulation 0 100.00 1040 Moving Stones Until Consecutive II Medium Array, Math, Sorting, Two_Pointers 8 55.00 1039 Minimum Score Triangulation of Polygon Medium Array, Dynamic_Programming 6 38.60 1038 Binary Search Tree to Greater Sum Tree Medium Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree 0 100.00 1037 Valid Boomerang Easy Array, Math, Geometry 0 100.00 1036 Escape a Large Maze Hard Array, Hash_Table, Depth_First_Search, Breadth_First_Search 115 73.46 1035 Uncrossed Lines Medium Array, Dynamic_Programming 5 85.32 1034 Coloring A Border Medium Array, Depth_First_Search, Breadth_First_Search, Matrix 1 93.85 1033 Moving Stones Until Consecutive Medium Math, Brainteaser 1 86.36 1032 Stream of Characters Hard Array, String, Design, Trie, Data_Stream 137 81.54 1031 Maximum Sum of Two Non-Overlapping Subarrays Medium Array, Dynamic_Programming, Sliding_Window 3 46.04 1030 Matrix Cells in Distance Order Easy Array, Math, Sorting, Matrix, Geometry 15 69.74 1029 Two City Scheduling Medium Array, Sorting, Greedy 1 97.54 1028 Recover a Tree From Preorder Traversal Hard String, Depth_First_Search, Tree, Binary_Tree 5 77.57 1027 Longest Arithmetic Subsequence Medium Array, Hash_Table, Dynamic_Programming, Binary_Search 47 98.28 1026 Maximum Difference Between Node and Ancestor Medium Depth_First_Search, Tree, Binary_Tree 1 65.84 1025 Divisor Game Easy Dynamic_Programming, Math, Game_Theory, Brainteaser 0 100.00 1024 Video Stitching Medium Array, Dynamic_Programming, Greedy 1 88.78 1023 Camelcase Matching Medium String, Two_Pointers, Trie, String_Matching 1 73.86 1022 Sum of Root To Leaf Binary Numbers Easy Depth_First_Search, Tree, Binary_Tree 3 28.58 1021 Remove Outermost Parentheses Easy String, Stack 4 75.39 1020 Number of Enclaves Medium Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find, Graph_Theory_I_Day_3_Matrix_Related_Problems 6 68.24 1019 Next Greater Node In Linked List Medium Array, Stack, Linked_List, Monotonic_Stack 11 96.35 1018 Binary Prefix Divisible By 5 Easy Array 3 84.58 1017 Convert to Base -2 Medium Math 1 89.45 1016 Binary String With Substrings Representing 1 To N Medium String 0 100.00 1015 Smallest Integer Divisible by K Medium Hash_Table, Math 2 90.67 1014 Best Sightseeing Pair Medium Array, Dynamic_Programming, Dynamic_Programming_I_Day_7 2 99.86 1013 Partition Array Into Three Parts With Equal Sum Easy Array, Greedy 1 100.00 1012 Numbers With Repeated Digits Hard Dynamic_Programming, Math 3 28.17 1011 Capacity To Ship Packages Within D Days Medium Array, Binary_Search 10 75.31 1010 Pairs of Songs With Total Durations Divisible by 60 Medium Array, Hash_Table, Counting 4 64.39 1009 Complement of Base 10 Integer Easy Bit_Manipulation 1 41.56 1008 Construct Binary Search Tree from Preorder Traversal Medium Array, Tree, Binary_Tree, Stack, Monotonic_Stack, Binary_Search_Tree 0 100.00 1007 Minimum Domino Rotations For Equal Row Medium Array, Greedy 5 79.64 1006 Clumsy Factorial Medium Math, Stack, Simulation 1 87.97 1005 Maximize Sum Of Array After K Negations Easy Array, Sorting, Greedy 3 81.75 1004 Max Consecutive Ones III Medium Array, Binary_Search, Prefix_Sum, Sliding_Window 3 79.01 1003 Check If Word Is Valid After Substitutions Medium String, Stack 5 98.54 1002 Find Common Characters Easy Array, String, Hash_Table 4 83.51 1001 Grid Illumination Hard Array, Hash_Table 75 90.57 1000 Minimum Cost to Merge Stones Hard Array, Dynamic_Programming 1 99.65 0999 Available Captures for Rook Easy Array, Matrix, Simulation 0 100.00 0998 Maximum Binary Tree II Medium Tree, Binary_Tree 0 100.00 0997 Find the Town Judge Easy Array, Hash_Table, Graph, Data_Structure_II_Day_19_Graph, Graph_Theory_I_Day_13_Graph_Theory 3 80.64 0996 Number of Squareful Arrays Hard Array, Dynamic_Programming, Math, Bit_Manipulation, Backtracking, Bitmask 2 72.32 0995 Minimum Number of K Consecutive Bit Flips Hard Array, Bit_Manipulation, Prefix_Sum, Sliding_Window 6 93.95 0994 Rotting Oranges Medium Array, Breadth_First_Search, Matrix, Algorithm_I_Day_9_Breadth_First_Search_Depth_First_Search 3 74.27 0993 Cousins in Binary Tree Easy Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree 1 60.08 0992 Subarrays with K Different Integers Hard Array, Hash_Table, Counting, Sliding_Window 4 99.36 0991 Broken Calculator Medium Math, Greedy 0 100.00 0990 Satisfiability of Equality Equations Medium Array, String, Graph, Union_Find 5 24.79 0989 Add to Array-Form of Integer Easy Array, Math, Programming_Skills_II_Day_5 7 65.92 0988 Smallest String Starting From Leaf Medium String, Depth_First_Search, Tree, Binary_Tree 4 58.47 0987 Vertical Order Traversal of a Binary Tree Hard Hash_Table, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree 4 71.48 0986 Interval List Intersections Medium Array, Two_Pointers, Algorithm_II_Day_4_Two_Pointers 2 99.95 0985 Sum of Even Numbers After Queries Medium Array, Simulation 6 71.11 0984 String Without AAA or BBB Medium String, Greedy 0 100.00 0983 Minimum Cost For Tickets Medium Array, Dynamic_Programming 1 93.95 0982 Triples with Bitwise AND Equal To Zero Hard Array, Hash_Table, Bit_Manipulation 120 79.59 0981 Time Based Key-Value Store Medium String, Hash_Table, Binary_Search, Design, Binary_Search_II_Day_16 239 72.78 0980 Unique Paths III Hard Array, Matrix, Bit_Manipulation, Backtracking 0 100.00 0979 Distribute Coins in Binary Tree Medium Depth_First_Search, Tree, Binary_Tree 0 100.00 0978 Longest Turbulent Subarray Medium Array, Dynamic_Programming, Sliding_Window 7 48.10 0977 Squares of a Sorted Array Easy Array, Sorting, Two_Pointers, Algorithm_I_Day_2_Two_Pointers 1 100.00 0976 Largest Perimeter Triangle Easy Array, Math, Sorting, Greedy, Programming_Skills_I_Day_3_Conditional_Statements 12 26.01 0975 Odd Even Jump Hard Array, Dynamic_Programming, Stack, Ordered_Set, Monotonic_Stack 49 98.38 0974 Subarray Sums Divisible by K Medium Array, Hash_Table, Prefix_Sum 3 99.95 0973 K Closest Points to Origin Medium Array, Math, Sorting, Heap_Priority_Queue, Divide_and_Conquer, Geometry, Quickselect, Data_Structure_II_Day_21_Heap_Priority_Queue, Programming_Skills_II_Day_8 4 98.26 0972 Equal Rational Numbers Hard String, Math 4 56.67 0971 Flip Binary Tree To Match Preorder Traversal Medium Depth_First_Search, Tree, Binary_Tree 0 100.00 0970 Powerful Integers Medium Hash_Table, Math 1 100.00 0969 Pancake Sorting Medium Array, Sorting, Greedy, Two_Pointers 1 100.00 0968 Binary Tree Cameras Hard Dynamic_Programming, Depth_First_Search, Tree, Binary_Tree 0 100.00 0967 Numbers With Same Consecutive Differences Medium Breadth_First_Search, Backtracking 1 100.00 0966 Vowel Spellchecker Medium Array, String, Hash_Table 17 98.95 0965 Univalued Binary Tree Easy Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree 1 17.57 0964 Least Operators to Express Number Hard Dynamic_Programming, Math 16 37.78 0963 Minimum Area Rectangle II Medium Array, Math, Geometry 12 92.95 0962 Maximum Width Ramp Medium Array, Stack, Monotonic_Stack 6 90.69 0961 N-Repeated Element in Size 2N Array Easy Array, Hash_Table 1 87.33 0960 Delete Columns to Make Sorted III Hard Array, String, Dynamic_Programming 13 43.86 0959 Regions Cut By Slashes Medium Depth_First_Search, Breadth_First_Search, Graph, Union_Find 9 39.29 0958 Check Completeness of a Binary Tree Medium Breadth_First_Search, Tree, Binary_Tree 2 43.56 0957 Prison Cells After N Days Medium Array, Hash_Table, Math, Bit_Manipulation 1 97.82 0956 Tallest Billboard Hard Array, Dynamic_Programming 18 92.68 0955 Delete Columns to Make Sorted II Medium Array, String, Greedy 2 68.84 0954 Array of Doubled Pairs Medium Array, Hash_Table, Sorting, Greedy 18 97.19 0953 Verifying an Alien Dictionary Easy Array, String, Hash_Table, Programming_Skills_I_Day_9_String 0 100.00 0952 Largest Component Size by Common Factor Hard Array, Math, Union_Find 225 76.99 0951 Flip Equivalent Binary Trees Medium Depth_First_Search, Tree, Binary_Tree 0 100.00 0950 Reveal Cards In Increasing Order Medium Array, Sorting, Simulation, Queue 1 100.00 0949 Largest Time for Given Digits Medium String, Enumeration 3 91.21 0948 Bag of Tokens Medium Array, Sorting, Greedy, Two_Pointers 4 32.05 0947 Most Stones Removed with Same Row or Column Medium Depth_First_Search, Graph, Union_Find 5 98.95 0946 Validate Stack Sequences Medium Array, Stack, Simulation 6 20.54 0945 Minimum Increment to Make Array Unique Medium Array, Sorting, Greedy, Counting 9 95.25 0944 Delete Columns to Make Sorted Easy Array, String 11 59.39 0943 Find the Shortest Superstring Hard Array, String, Dynamic_Programming, Bit_Manipulation, Bitmask 16 100.00 0942 DI String Match Easy Array, String, Math, Greedy, Two_Pointers 4 33.74 0941 Valid Mountain Array Easy Array 1 100.00 0940 Distinct Subsequences II Hard String, Dynamic_Programming 2 99.41 0939 Minimum Area Rectangle Medium Array, Hash_Table, Math, Sorting, Geometry 63 94.31 0938 Range Sum of BST Easy Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree 0 100.00 0937 Reorder Data in Log Files Easy Array, String, Sorting 4 92.15 0936 Stamping The Sequence Hard String, Greedy, Stack, Queue 6 78.43 0935 Knight Dialer Medium Dynamic_Programming 4 99.08 0934 Shortest Bridge Medium Array, Depth_First_Search, Breadth_First_Search, Matrix, Graph_Theory_I_Day_6_Matrix_Related_Problems 6 97.87 0933 Number of Recent Calls Easy Design, Queue, Data_Stream 16 97.58 0932 Beautiful Array Medium Array, Math, Divide_and_Conquer 1 89.66 0931 Minimum Falling Path Sum Medium Array, Dynamic_Programming, Matrix, Dynamic_Programming_I_Day_13 4 72.19 0930 Binary Subarrays With Sum Medium Array, Hash_Table, Prefix_Sum, Sliding_Window 3 84.84 0929 Unique Email Addresses Easy Array, String, Hash_Table 10 92.59 0928 Minimize Malware Spread II Hard Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find 41 31.01 0927 Three Equal Parts Hard Array, Math 2 90.20 0926 Flip String to Monotone Increasing Medium String, Dynamic_Programming 12 63.41 0925 Long Pressed Name Easy String, Two_Pointers 1 84.87 0924 Minimize Malware Spread Hard Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find 10 47.21 0923 3Sum With Multiplicity Medium Array, Hash_Table, Sorting, Two_Pointers, Counting 14 69.20 0922 Sort Array By Parity II Easy Array, Sorting, Two_Pointers 4 52.95 0921 Minimum Add to Make Parentheses Valid Medium String, Greedy, Stack 2 33.69 0920 Number of Music Playlists Hard Dynamic_Programming, Math, Combinatorics 2 96.55 0919 Complete Binary Tree Inserter Medium Breadth_First_Search, Tree, Binary_Tree, Design 11 96.06 0918 Maximum Sum Circular Subarray Medium Array, Dynamic_Programming, Divide_and_Conquer, Queue, Monotonic_Queue, Dynamic_Programming_I_Day_5 3 92.86 0917 Reverse Only Letters Easy String, Two_Pointers 0 100.00 0916 Word Subsets Medium Array, String, Hash_Table 30 57.30 0915 Partition Array into Disjoint Intervals Medium Array 2 99.81 0914 X of a Kind in a Deck of Cards Easy Array, Hash_Table, Math, Counting, Number_Theory 16 19.29 0913 Cat and Mouse Hard Dynamic_Programming, Math, Graph, Memoization, Topological_Sort, Game_Theory 16 97.20 0912 Sort an Array Medium Array, Sorting, Heap_Priority_Queue, Divide_and_Conquer, Merge_Sort, Bucket_Sort, Counting_Sort, Radix_Sort 25 38.15 0911 Online Election Medium Array, Hash_Table, Binary_Search, Design, Binary_Search_II_Day_20 63 98.81 0910 Smallest Range II Medium Array, Math, Sorting, Greedy, Programming_Skills_II_Day_13 10 73.16 0909 Snakes and Ladders Medium Array, Breadth_First_Search, Matrix 7 79.52 0908 Smallest Range I Easy Array, Math 2 88.84 0907 Sum of Subarray Minimums Medium Array, Dynamic_Programming, Stack, Monotonic_Stack 20 95.88 0906 Super Palindromes Hard Math, Enumeration 229 91.38 0905 Sort Array By Parity Easy Array, Sorting, Two_Pointers 1 95.51 0904 Fruit Into Baskets Medium Array, Hash_Table, Sliding_Window 6 95.60 0903 Valid Permutations for DI Sequence Hard Dynamic_Programming 3 74.00 0902 Numbers At Most N Given Digit Set Hard Array, Dynamic_Programming, Math, Binary_Search 2 18.29 0901 Online Stock Span Medium Stack, Design, Monotonic_Stack, Data_Stream 47 76.17 0900 RLE Iterator Medium Array, Design, Counting, Iterator 3 100.00 0899 Orderly Queue Hard String, Math, Sorting 1 100.00 0898 Bitwise ORs of Subarrays Medium Array, Dynamic_Programming, Bit_Manipulation 151 97.74 0897 Increasing Order Search Tree Easy Depth_First_Search, Tree, Binary_Tree, Stack, Binary_Search_Tree 0 100.00 0896 Monotonic Array Easy Array, Programming_Skills_II_Day_1 2 86.21 0895 Maximum Frequency Stack Hard Hash_Table, Stack, Design, Ordered_Set 43 65.81 0894 All Possible Full Binary Trees Medium Dynamic_Programming, Tree, Binary_Tree, Recursion, Memoization 3 68.56 0893 Groups of Special-Equivalent Strings Medium Array, String, Hash_Table 3 99.09 0892 Surface Area of 3D Shapes Easy Array, Math, Matrix, Geometry 2 98.73 0891 Sum of Subsequence Widths Hard Array, Math, Sorting 56 30.61 0890 Find and Replace Pattern Medium Array, String, Hash_Table 1 97.13 0889 Construct Binary Tree from Preorder and Postorder Traversal Medium Array, Hash_Table, Tree, Binary_Tree, Divide_and_Conquer 1 91.04 0888 Fair Candy Swap Easy Array, Hash_Table, Sorting, Binary_Search 18 68.20 0887 Super Egg Drop Hard Dynamic_Programming, Math, Binary_Search 0 100.00 0886 Possible Bipartition Medium Depth_First_Search, Breadth_First_Search, Graph, Union_Find, Graph_Theory_I_Day_14_Graph_Theory 20 80.12 0885 Spiral Matrix III Medium Array, Matrix, Simulation 3 95.45 0884 Uncommon Words from Two Sentences Easy String, Hash_Table 1 100.00 0883 Projection Area of 3D Shapes Easy Array, Math, Matrix, Geometry 1 100.00 0882 Reachable Nodes In Subdivided Graph Hard Heap_Priority_Queue, Graph, Shortest_Path 28 95.85 0881 Boats to Save People Medium Array, Sorting, Greedy, Two_Pointers 20 61.11 0880 Decoded String at Index Medium String, Stack 0 100.00 0879 Profitable Schemes Hard Array, Dynamic_Programming 80 43.42 0878 Nth Magical Number Hard Math, Binary_Search 0 100.00 0877 Stone Game Medium Array, Dynamic_Programming, Math, Game_Theory 0 100.00 0876 Middle of the Linked List Easy Two_Pointers, Linked_List, Algorithm_I_Day_5_Two_Pointers, Programming_Skills_I_Day_10_Linked_List_and_Tree, Level_1_Day_4_Linked_List 0 100.00 0875 Koko Eating Bananas Medium Array, Binary_Search, Binary_Search_II_Day_4 15 91.32 0874 Walking Robot Simulation Medium Array, Simulation 16 93.75 0873 Length of Longest Fibonacci Subsequence Medium Array, Hash_Table, Dynamic_Programming 120 92.64 0872 Leaf-Similar Trees Easy Depth_First_Search, Tree, Binary_Tree 0 100.00 0871 Minimum Number of Refueling Stops Hard Array, Dynamic_Programming, Greedy, Heap_Priority_Queue 3 88.52 0870 Advantage Shuffle Medium Array, Sorting, Greedy 188 28.01 0869 Reordered Power of 2 Medium Math, Sorting, Counting, Enumeration 9 25.97 0868 Binary Gap Easy Bit_Manipulation 1 82.94 0867 Transpose Matrix Easy Array, Matrix, Simulation 1 60.83 0866 Prime Palindrome Medium Math 2 84.68 0865 Smallest Subtree with all the Deepest Nodes Medium Hash_Table, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree 0 100.00 0864 Shortest Path to Get All Keys Hard Breadth_First_Search, Bit_Manipulation 12 100.00 0863 All Nodes Distance K in Binary Tree Medium Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree 12 80.25 0862 Shortest Subarray with Sum at Least K Hard Array, Binary_Search, Heap_Priority_Queue, Prefix_Sum, Sliding_Window, Queue, Monotonic_Queue 53 74.73 0861 Score After Flipping Matrix Medium Array, Greedy, Matrix, Bit_Manipulation 1 70.04 0860 Lemonade Change Easy Array, Greedy, Programming_Skills_II_Day_17 2 90.84 0859 Buddy Strings Easy String, Hash_Table 2 85.33 0858 Mirror Reflection Medium Math, Geometry 0 100.00 0857 Minimum Cost to Hire K Workers Hard Array, Sorting, Greedy, Heap_Priority_Queue 26 85.40 0856 Score of Parentheses Medium String, Stack 1 67.71 0855 Exam Room Medium Design, Ordered_Set 19 74.01 0854 K-Similar Strings Hard String, Breadth_First_Search 2 99.58 0853 Car Fleet Medium Array, Sorting, Stack, Monotonic_Stack 118 74.11 0852 Peak Index in a Mountain Array Easy Array, Binary_Search, Binary_Search_I_Day_2 0 100.00 0851 Loud and Rich Medium Array, Depth_First_Search, Graph, Topological_Sort 3 99.67 0850 Rectangle Area II Hard Array, Ordered_Set, Segment_Tree, Line_Sweep 4 97.00 0849 Maximize Distance to Closest Person Medium Array 1 100.00 0848 Shifting Letters Medium Array, String 11 88.11 0847 Shortest Path Visiting All Nodes Hard Dynamic_Programming, Breadth_First_Search, Bit_Manipulation, Graph, Bitmask, Graph_Theory_I_Day_10_Standard_Traversal 14 78.72 0846 Hand of Straights Medium Array, Hash_Table, Sorting, Greedy 19 96.16 0845 Longest Mountain in Array Medium Array, Dynamic_Programming, Two_Pointers, Enumeration 2 94.37 0844 Backspace String Compare Easy String, Two_Pointers, Stack, Simulation, Algorithm_II_Day_4_Two_Pointers, Level_1_Day_14_Stack 0 100.00 0843 Guess the Word Hard Array, String, Math, Game_Theory, Interactive 2 68.01 0842 Split Array into Fibonacci Sequence Medium String, Backtracking 4 62.81 0841 Keys and Rooms Medium Depth_First_Search, Breadth_First_Search, Graph, Data_Structure_II_Day_19_Graph, Graph_Theory_I_Day_7_Standard_Traversal 3 51.54 0840 Magic Squares In Grid Medium Array, Math, Matrix 0 100.00 0839 Similar String Groups Hard Array, String, Depth_First_Search, Breadth_First_Search, Union_Find 15 80.39 0838 Push Dominoes Medium String, Dynamic_Programming, Two_Pointers 21 73.78 0837 New 21 Game Medium Dynamic_Programming, Math, Sliding_Window, Probability_and_Statistics 5 77.70 0836 Rectangle Overlap Easy Math, Geometry 0 100.00 0835 Image Overlap Medium Array, Matrix 6 98.73 0834 Sum of Distances in Tree Hard Dynamic_Programming, Depth_First_Search, Tree, Graph 52 91.09 0833 Find And Replace in String Medium Array, String, Sorting 3 70.10 0832 Flipping an Image Easy Array, Matrix, Two_Pointers, Simulation 1 68.54 0831 Masking Personal Information Medium String 1 84.30 0830 Positions of Large Groups Easy String 2 80.94 0829 Consecutive Numbers Sum Hard Math, Enumeration 3 93.37 0828 Count Unique Characters of All Substrings of a Given String Hard String, Hash_Table, Dynamic_Programming 101 18.42 0827 Making A Large Island Hard Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find 147 74.37 0826 Most Profit Assigning Work Medium Array, Sorting, Greedy, Binary_Search, Two_Pointers, Binary_Search_II_Day_11 21 83.83 0825 Friends Of Appropriate Ages Medium Array, Sorting, Binary_Search, Two_Pointers 3 87.71 0824 Goat Latin Easy String 2 94.82 0823 Binary Trees With Factors Medium Array, Hash_Table, Dynamic_Programming 28 80.54 0822 Card Flipping Game Medium Array, Hash_Table 2 96.55 0821 Shortest Distance to a Character Easy Array, String, Two_Pointers 3 42.73 0820 Short Encoding of Words Medium Array, String, Hash_Table, Trie 35 49.44 0819 Most Common Word Easy String, Hash_Table, Counting 10 88.85 0818 Race Car Hard Dynamic_Programming 9 82.90 0817 Linked List Components Medium Hash_Table, Linked_List 7 76.10 0816 Ambiguous Coordinates Medium String, Backtracking 4 98.95 0815 Bus Routes Hard Array, Hash_Table, Breadth_First_Search 49 89.11 0814 Binary Tree Pruning Medium Depth_First_Search, Tree, Binary_Tree 0 100.00 0813 Largest Sum of Averages Medium Array, Dynamic_Programming 4 97.01 0812 Largest Triangle Area Easy Array, Math, Geometry 5 92.04 0811 Subdomain Visit Count Medium Array, String, Hash_Table, Counting 5 100.00 0810 Chalkboard XOR Game Hard Array, Math, Bit_Manipulation, Game_Theory, Brainteaser 0 100.00 0809 Expressive Words Medium Array, String, Two_Pointers 2 86.09 0808 Soup Servings Medium Dynamic_Programming, Math, Probability_and_Statistics 1 96.04 0807 Max Increase to Keep City Skyline Medium Array, Greedy, Matrix 2 23.49 0806 Number of Lines To Write String Easy Array, String 1 65.23 0805 Split Array With Same Average Hard Array, Dynamic_Programming, Math, Bit_Manipulation, Bitmask 1323 22.41 0804 Unique Morse Code Words Easy Array, String, Hash_Table 2 89.27 0803 Bricks Falling When Hit Hard Array, Matrix, Union_Find 12 94.92 0802 Find Eventual Safe States Medium Depth_First_Search, Breadth_First_Search, Graph, Topological_Sort, Graph_Theory_I_Day_9_Standard_Traversal 7 74.93 0801 Minimum Swaps To Make Sequences Increasing Hard Array, Dynamic_Programming 6 71.94 0799 Champagne Tower Medium Dynamic_Programming 4 92.45 0798 Smallest Rotation with Highest Score Hard Array, Prefix_Sum 9 78.22 0797 All Paths From Source to Target Medium Depth_First_Search, Breadth_First_Search, Graph, Backtracking, Algorithm_II_Day_8_Breadth_First_Search_Depth_First_Search, Graph_Theory_I_Day_7_Standard_Traversal 2 90.53 0796 Rotate String Easy String, String_Matching 0 100.00 0795 Number of Subarrays with Bounded Maximum Medium Array, Two_Pointers 2 100.00 0794 Valid Tic-Tac-Toe State Medium Array, String 0 100.00 0793 Preimage Size of Factorial Zeroes Function Hard Math, Binary_Search 0 100.00 0792 Number of Matching Subsequences Medium String, Hash_Table, Sorting, Trie 92 84.26 0791 Custom Sort String Medium String, Hash_Table, Sorting 1 78.82 0790 Domino and Tromino Tiling Medium Dynamic_Programming 0 100.00 0789 Escape The Ghosts Medium Array, Math 0 100.00 0788 Rotated Digits Medium Dynamic_Programming, Math 2 98.95 0787 Cheapest Flights Within K Stops Medium Dynamic_Programming, Depth_First_Search, Breadth_First_Search, Heap_Priority_Queue, Graph, Shortest_Path 9 53.93 0786 K-th Smallest Prime Fraction Medium Array, Binary_Search, Heap_Priority_Queue 2 96.60 0785 Is Graph Bipartite? Medium Depth_First_Search, Breadth_First_Search, Graph, Union_Find, Graph_Theory_I_Day_14_Graph_Theory 0 100.00 0784 Letter Case Permutation Medium String, Bit_Manipulation, Backtracking, Algorithm_I_Day_11_Recursion_Backtracking 10 40.38 0783 Minimum Distance Between BST Nodes Easy Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Binary_Search_Tree 0 100.00 0782 Transform to Chessboard Hard Array, Math, Matrix, Bit_Manipulation 2 53.57 0781 Rabbits in Forest Medium Array, Hash_Table, Math, Greedy 1 99.15 0780 Reaching Points Hard Math 0 100.00 0779 K-th Symbol in Grammar Medium Math, Bit_Manipulation, Recursion 0 100.00 0778 Swim in Rising Water Hard Array, Depth_First_Search, Breadth_First_Search, Binary_Search, Matrix, Heap_Priority_Queue, Union_Find 13 69.75 0777 Swap Adjacent in LR String Medium String, Two_Pointers 4 85.13 0775 Global and Local Inversions Medium Array, Math 1 99.74 0773 Sliding Puzzle Hard Array, Breadth_First_Search, Matrix 9 81.80 0771 Jewels and Stones Easy String, Hash_Table 1 91.74 0770 Basic Calculator IV Hard String, Hash_Table, Math, Stack, Recursion 8 96.92 0769 Max Chunks To Make Sorted Medium Array, Sorting, Greedy, Stack, Monotonic_Stack 0 100.00 0768 Max Chunks To Make Sorted II Hard Array, Sorting, Greedy, Stack, Monotonic_Stack 1 87.58 0767 Reorganize String Medium String, Hash_Table, Sorting, Greedy, Heap_Priority_Queue, Counting 1 94.60 0766 Toeplitz Matrix Easy Array, Matrix 1 83.45 0765 Couples Holding Hands Hard Depth_First_Search, Greedy, Breadth_First_Search, Graph, Union_Find 0 100.00 0764 Largest Plus Sign Medium Array, Dynamic_Programming 39 87.23 0763 Partition Labels Medium Top_100_Liked_Questions, String, Hash_Table, Greedy, Two_Pointers, Data_Structure_II_Day_7_String 1 100.00 0762 Prime Number of Set Bits in Binary Representation Easy Math, Bit_Manipulation 4 98.39 0761 Special Binary String Hard String, Recursion 1 100.00 0757 Set Intersection Size At Least Two Hard Array, Sorting, Greedy 4 100.00 0756 Pyramid Transition Matrix Medium Depth_First_Search, Breadth_First_Search, Bit_Manipulation 129 82.94 0754 Reach a Number Medium Math, Binary_Search 0 100.00 0753 Cracking the Safe Hard Depth_First_Search, Graph, Eulerian_Circuit 4 96.44 0752 Open the Lock Medium Array, String, Hash_Table, Breadth_First_Search, Graph_Theory_I_Day_12_Breadth_First_Search 72 91.06 0749 Contain Virus Hard Array, Depth_First_Search, Breadth_First_Search, Matrix, Simulation 23 37.62 0748 Shortest Completing Word Easy Array, String, Hash_Table 3 93.75 0747 Largest Number At Least Twice of Others Easy Array, Sorting 0 100.00 0746 Min Cost Climbing Stairs Easy Array, Dynamic_Programming, Dynamic_Programming_I_Day_2, Level_1_Day_11_Dynamic_Programming 1 86.38 0745 Prefix and Suffix Search Hard String, Design, Trie 366 76.15 0744 Find Smallest Letter Greater Than Target Easy Array, Binary_Search, Binary_Search_I_Day_4 0 100.00 0743 Network Delay Time Medium Depth_First_Search, Breadth_First_Search, Heap_Priority_Queue, Graph, Shortest_Path 3 99.87 0741 Cherry Pickup Hard Array, Dynamic_Programming, Matrix 11 99.40 0740 Delete and Earn Medium Array, Hash_Table, Dynamic_Programming, Dynamic_Programming_I_Day_3 4 77.68 0739 Daily Temperatures Medium Top_100_Liked_Questions, Array, Stack, Monotonic_Stack, Programming_Skills_II_Day_6 10 94.99 0738 Monotone Increasing Digits Medium Math, Greedy 0 100.00 0736 Parse Lisp Expression Hard String, Hash_Table, Stack, Recursion 4 95.58 0735 Asteroid Collision Medium Array, Stack 2 99.59 0733 Flood Fill Easy Array, Depth_First_Search, Breadth_First_Search, Matrix, Algorithm_I_Day_7_Breadth_First_Search_Depth_First_Search, Graph_Theory_I_Day_1_Matrix_Related_Problems, Level_1_Day_9_Graph/BFS/DFS 1 85.36 0732 My Calendar III Hard Binary_Search, Design, Ordered_Set, Segment_Tree 40 95.37 0731 My Calendar II Medium Binary_Search, Design, Ordered_Set, Segment_Tree 27 97.74 0730 Count Different Palindromic Subsequences Hard String, Dynamic_Programming 45 92.84 0729 My Calendar I Medium Binary_Search, Design, Ordered_Set, Segment_Tree, Programming_Skills_II_Day_20 17 97.23 0728 Self Dividing Numbers Easy Math 1 100.00 0726 Number of Atoms Hard String, Hash_Table, Sorting, Stack 4 87.22 0725 Split Linked List in Parts Medium Linked_List 1 30.85 0724 Find Pivot Index Easy Array, Prefix_Sum, Level_1_Day_1_Prefix_Sum 2 69.67 0722 Remove Comments Medium Array, String 1 80.24 0721 Accounts Merge Medium Array, String, Depth_First_Search, Breadth_First_Search, Union_Find 71 31.21 0720 Longest Word in Dictionary Medium Array, String, Hash_Table, Sorting, Trie 13 84.66 0719 Find K-th Smallest Pair Distance Hard Array, Sorting, Binary_Search, Two_Pointers 8 81.40 0718 Maximum Length of Repeated Subarray Medium Array, Dynamic_Programming, Binary_Search, Sliding_Window, Hash_Function, Rolling_Hash 58 77.21 0717 1-bit and 2-bit Characters Easy Array 0 100.00 0715 Range Module Hard Design, Ordered_Set, Segment_Tree 35 98.62 0714 Best Time to Buy and Sell Stock with Transaction Fee Medium Array, Dynamic_Programming, Greedy, Dynamic_Programming_I_Day_8 4 78.57 0713 Subarray Product Less Than K Medium Array, Sliding_Window, Algorithm_II_Day_5_Sliding_Window, Programming_Skills_II_Day_12 8 39.00 0712 Minimum ASCII Delete Sum for Two Strings Medium String, Dynamic_Programming 18 91.28 0710 Random Pick with Blacklist Hard Hash_Table, Math, Sorting, Binary_Search, Randomized 56 74.41 0709 To Lower Case Easy String, Programming_Skills_I_Day_9_String 1 71.74 0707 Design Linked List Medium Design, Linked_List, Data_Structure_II_Day_12_Linked_List, Programming_Skills_II_Day_19 10 70.60 0706 Design HashMap Easy Array, Hash_Table, Design, Linked_List, Hash_Function, Data_Structure_II_Day_2_Array 13 95.71 0705 Design HashSet Easy Array, Hash_Table, Design, Linked_List, Hash_Function 29 57.06 0704 Binary Search Easy Array, Binary_Search, Algorithm_I_Day_1_Binary_Search, Binary_Search_I_Day_1, Level_1_Day_7_Binary_Search 0 100.00 0703 Kth Largest Element in a Stream Easy Tree, Binary_Tree, Design, Heap_Priority_Queue, Binary_Search_Tree, Data_Stream 22 52.43 0701 Insert into a Binary Search Tree Medium Tree, Binary_Tree, Binary_Search_Tree, Data_Structure_I_Day_13_Tree 0 100.00 0700 Search in a Binary Search Tree Easy Tree, Binary_Tree, Binary_Search_Tree, Data_Structure_I_Day_13_Tree 0 100.00 0699 Falling Squares Hard Array, Ordered_Set, Segment_Tree 8 91.03 0698 Partition to K Equal Sum Subsets Medium Array, Dynamic_Programming, Bit_Manipulation, Backtracking, Bitmask, Memoization 24 85.43 0697 Degree of an Array Easy Array, Hash_Table 14 93.19 0696 Count Binary Substrings Easy String, Two_Pointers 5 100.00 0695 Max Area of Island Medium Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find, Algorithm_I_Day_7_Breadth_First_Search_Depth_First_Search, Graph_Theory_I_Day_2_Matrix_Related_Problems 3 76.79 0693 Binary Number with Alternating Bits Easy Bit_Manipulation 0 100.00 0692 Top K Frequent Words Medium String, Hash_Table, Sorting, Heap_Priority_Queue, Counting, Trie, Bucket_Sort, Level_1_Day_15_Heap 11 38.54 0691 Stickers to Spell Word Hard Array, String, Dynamic_Programming, Bit_Manipulation, Backtracking, Bitmask 34 70.23 0690 Employee Importance Medium Hash_Table, Depth_First_Search, Breadth_First_Search 7 77.84 0689 Maximum Sum of 3 Non-Overlapping Subarrays Hard Array, Dynamic_Programming 5 64.24 0688 Knight Probability in Chessboard Medium Dynamic_Programming 7 85.13 0687 Longest Univalue Path Medium Depth_First_Search, Tree, Binary_Tree 3 79.43 0686 Repeated String Match Medium String, String_Matching 7 94.56 0685 Redundant Connection II Hard Depth_First_Search, Breadth_First_Search, Graph, Union_Find 1 96.65 0684 Redundant Connection Medium Depth_First_Search, Breadth_First_Search, Graph, Union_Find 0 100.00 0682 Baseball Game Easy Array, Stack, Simulation 4 57.60 0680 Valid Palindrome II Easy String, Greedy, Two_Pointers 10 61.31 0679 24 Game Hard Array, Math, Backtracking 3 87.01 0678 Valid Parenthesis String Medium String, Dynamic_Programming, Greedy, Stack 0 100.00 0677 Map Sum Pairs Medium String, Hash_Table, Design, Trie 17 70.10 0676 Implement Magic Dictionary Medium String, Hash_Table, Design, Trie 38 86.83 0675 Cut Off Trees for Golf Event Hard Array, Breadth_First_Search, Matrix, Heap_Priority_Queue 417 73.86 0674 Longest Continuous Increasing Subsequence Easy Array 2 40.35 0673 Number of Longest Increasing Subsequence Medium Array, Dynamic_Programming, Segment_Tree, Binary_Indexed_Tree, Algorithm_II_Day_16_Dynamic_Programming 25 68.75 0672 Bulb Switcher II Medium Math, Depth_First_Search, Breadth_First_Search, Bit_Manipulation 0 100.00 0671 Second Minimum Node In a Binary Tree Easy Depth_First_Search, Tree, Binary_Tree 0 100.00 0670 Maximum Swap Medium Math, Greedy 1 80.14 0669 Trim a Binary Search Tree Medium Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree 0 100.00 0668 Kth Smallest Number in Multiplication Table Hard Math, Binary_Search 12 97.84 0667 Beautiful Arrangement II Medium Array, Math 1 84.62 0665 Non-decreasing Array Medium Array 1 86.75 0664 Strange Printer Hard String, Dynamic_Programming 24 76.35 0662 Maximum Width of Binary Tree Medium Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree 2 78.93 0661 Image Smoother Easy Array, Matrix 2 100.00 0659 Split Array into Consecutive Subsequences Medium Array, Hash_Table, Greedy, Heap_Priority_Queue 4 95.88 0658 Find K Closest Elements Medium Array, Sorting, Binary_Search, Two_Pointers, Heap_Priority_Queue, Binary_Search_II_Day_2 3 99.20 0657 Robot Return to Origin Easy String, Simulation 3 99.87 0655 Print Binary Tree Medium Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree 1 98.04 0654 Maximum Binary Tree Medium Array, Tree, Binary_Tree, Stack, Monotonic_Stack, Divide_and_Conquer 3 84.36 0653 Two Sum IV - Input is a BST Easy Hash_Table, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Two_Pointers, Binary_Search_Tree, Data_Structure_I_Day_14_Tree 5 74.23 0652 Find Duplicate Subtrees Medium Hash_Table, Depth_First_Search, Tree, Binary_Tree 32 60.16 0650 2 Keys Keyboard Medium Dynamic_Programming, Math 0 100.00 0649 Dota2 Senate Medium String, Greedy, Queue 4 95.00 0648 Replace Words Medium Array, String, Hash_Table, Trie 14 87.12 0647 Palindromic Substrings Medium Top_100_Liked_Questions, String, Dynamic_Programming 2 98.77 0646 Maximum Length of Pair Chain Medium Array, Dynamic_Programming, Sorting, Greedy 11 88.84 0645 Set Mismatch Easy Array, Hash_Table, Sorting, Bit_Manipulation 2 97.45 0643 Maximum Average Subarray I Easy Array, Sliding_Window 5 74.81 0641 Design Circular Deque Medium Array, Design, Linked_List, Queue 3 100.00 0640 Solve the Equation Medium String, Math, Simulation 5 69.29 0639 Decode Ways II Hard String, Dynamic_Programming 22 93.12 0638 Shopping Offers Medium Array, Dynamic_Programming, Bit_Manipulation, Backtracking, Bitmask, Memoization 6 71.06 0637 Average of Levels in Binary Tree Easy Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree 2 89.32 0636 Exclusive Time of Functions Medium Array, Stack 17 76.73 0633 Sum of Square Numbers Medium Math, Binary_Search, Two_Pointers, Binary_Search_I_Day_10 4 82.92 0632 Smallest Range Covering Elements from K Lists Hard Array, Hash_Table, Sorting, Greedy, Heap_Priority_Queue, Sliding_Window 31 87.39 0630 Course Schedule III Hard Array, Greedy, Heap_Priority_Queue 53 58.83 0629 K Inverse Pairs Array Hard Dynamic_Programming 19 94.44 0628 Maximum Product of Three Numbers Easy Array, Math, Sorting 2 99.90 0627 Swap Salary Easy Database, SQL_I_Day_2_Select_and_Order 191 96.89 0626 Exchange Seats Medium Database 274 65.75 0623 Add One Row to Tree Medium Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree 0 100.00 0622 Design Circular Queue Medium Array, Design, Linked_List, Queue, Programming_Skills_II_Day_20 3 100.00 0621 Task Scheduler Medium Array, Hash_Table, Sorting, Greedy, Heap_Priority_Queue, Counting 3 84.32 0620 Not Boring Movies Easy Database 258 28.33 0617 Merge Two Binary Trees Easy Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Algorithm_I_Day_8_Breadth_First_Search_Depth_First_Search 1 72.47 0611 Valid Triangle Number Medium Array, Sorting, Greedy, Binary_Search, Two_Pointers, Binary_Search_II_Day_1 10 100.00 0609 Find Duplicate File in System Medium Array, String, Hash_Table 20 97.68 0608 Tree Node Medium LeetCode_Curated_SQL_70, Database, SQL_I_Day_4_Union_and_Select 347 95.17 0607 Sales Person Easy LeetCode_Curated_SQL_70, Database, SQL_I_Day_6_Union 1046 86.04 0606 Construct String from Binary Tree Easy String, Depth_First_Search, Tree, Binary_Tree 1 100.00 0605 Can Place Flowers Easy Array, Greedy 1 96.77 0601 Human Traffic of Stadium Hard Database 328 62.41 0600 Non-negative Integers without Consecutive Ones Hard Dynamic_Programming 2 74.62 0599 Minimum Index Sum of Two Lists Easy Array, String, Hash_Table 7 93.97 0598 Range Addition II Easy Array, Math 0 100.00 0596 Classes More Than 5 Students Easy Database 243 92.65 0595 Big Countries Easy Database, SQL_I_Day_1_Select 241 92.61 0594 Longest Harmonious Subsequence Easy Array, Hash_Table, Sorting 11 99.77 0593 Valid Square Medium Math, Geometry 1 97.14 0592 Fraction Addition and Subtraction Medium String, Math, Simulation 4 98.58 0591 Tag Validator Hard String, Stack 3 70.89 0590 N-ary Tree Postorder Traversal Easy Depth_First_Search, Tree, Stack 0 100.00 0589 N-ary Tree Preorder Traversal Easy Depth_First_Search, Tree, Stack, Programming_Skills_I_Day_5_Function, Level_1_Day_6_Tree 2 54.35 0587 Erect the Fence Hard Array, Math, Geometry 10 87.50 0586 Customer Placing the Largest Number of Orders Easy LeetCode_Curated_SQL_70, Database, SQL_I_Day_8_Function 392 90.54 0584 Find Customer Referee Easy Database, SQL_I_Day_1_Select 505 43.87 0583 Delete Operation for Two Strings Medium String, Dynamic_Programming, Algorithm_II_Day_17_Dynamic_Programming 12 73.04 0581 Shortest Unsorted Continuous Subarray Medium Array, Sorting, Greedy, Two_Pointers, Stack, Monotonic_Stack 1 98.19 0576 Out of Boundary Paths Medium Dynamic_Programming 7 74.13 0575 Distribute Candies Easy Array, Hash_Table 64 40.90 0572 Subtree of Another Tree Easy Depth_First_Search, Tree, Binary_Tree, Hash_Function, String_Matching, Algorithm_II_Day_7_Breadth_First_Search_Depth_First_Search 0 100.00 0567 Permutation in String Medium String, Hash_Table, Two_Pointers, Sliding_Window, Algorithm_I_Day_6_Sliding_Window 4 95.23 0566 Reshape the Matrix Easy Array, Matrix, Simulation, Data_Structure_I_Day_4_Array, Programming_Skills_I_Day_7_Array 1 84.34 0565 Array Nesting Medium Array, Depth_First_Search 4 98.54 0564 Find the Closest Palindrome Hard String, Math 1 100.00 0563 Binary Tree Tilt Easy Depth_First_Search, Tree, Binary_Tree 0 100.00 0561 Array Partition I Easy Array, Sorting, Greedy, Counting_Sort 18 31.77 0560 Subarray Sum Equals K Medium Top_100_Liked_Questions, Array, Hash_Table, Prefix_Sum, Data_Structure_II_Day_5_Array 18 89.51 0559 Maximum Depth of N-ary Tree Easy Depth_First_Search, Breadth_First_Search, Tree 1 78.18 0558 Logical OR of Two Binary Grids Represented as Quad-Trees Medium Tree, Divide_and_Conquer 0 100.00 0557 Reverse Words in a String III Easy String, Two_Pointers, Algorithm_I_Day_4_Two_Pointers 5 88.09 0556 Next Greater Element III Medium String, Math, Two_Pointers, Programming_Skills_II_Day_10 0 100.00 0554 Brick Wall Medium Array, Hash_Table 13 75.64 0553 Optimal Division Medium Array, Dynamic_Programming, Math 1 96.63 0552 Student Attendance Record II Hard Dynamic_Programming 8 99.21 0551 Student Attendance Record I Easy String 1 68.22 0547 Number of Provinces Medium Depth_First_Search, Breadth_First_Search, Graph, Union_Find, Algorithm_II_Day_6_Breadth_First_Search_Depth_First_Search, Graph_Theory_I_Day_8_Standard_Traversal 1 94.56 0546 Remove Boxes Hard Array, Dynamic_Programming, Memoization 86 60.93 0543 Diameter of Binary Tree Easy Top_100_Liked_Questions, Depth_First_Search, Tree, Binary_Tree 1 55.16 0542 01 Matrix Medium Array, Dynamic_Programming, Breadth_First_Search, Matrix, Algorithm_I_Day_9_Breadth_First_Search_Depth_First_Search, Graph_Theory_I_Day_5_Matrix_Related_Problems 6 96.78 0541 Reverse String II Easy String, Two_Pointers 1 93.18 0540 Single Element in a Sorted Array Medium Array, Binary_Search, Binary_Search_II_Day_9 0 100.00 0539 Minimum Time Difference Medium Array, String, Math, Sorting 3 93.52 0538 Convert BST to Greater Tree Medium Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree 1 83.78 0537 Complex Number Multiplication Medium String, Math, Simulation 7 62.22 0535 Encode and Decode TinyURL Medium String, Hash_Table, Design, Hash_Function 4 65.42 0532 K-diff Pairs in an Array Medium Array, Hash_Table, Sorting, Binary_Search, Two_Pointers 14 49.69 0530 Minimum Absolute Difference in BST Easy Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Binary_Search_Tree 0 100.00 0529 Minesweeper Medium Array, Depth_First_Search, Breadth_First_Search, Matrix 0 100.00 0528 Random Pick with Weight Medium Math, Binary_Search, Prefix_Sum, Randomized, Binary_Search_II_Day_13 29 83.26 0526 Beautiful Arrangement Medium Array, Dynamic_Programming, Bit_Manipulation, Backtracking, Bitmask 3 98.99 0525 Contiguous Array Medium Array, Hash_Table, Prefix_Sum 17 92.02 0524 Longest Word in Dictionary through Deleting Medium Array, String, Sorting, Two_Pointers 10 97.43 0523 Continuous Subarray Sum Medium Array, Hash_Table, Math, Prefix_Sum 25 78.40 0522 Longest Uncommon Subsequence II Medium Array, String, Hash_Table, Sorting, Two_Pointers 1 100.00 0521 Longest Uncommon Subsequence I Easy String 0 100.00 0520 Detect Capital Easy String 2 72.44 0519 Random Flip Matrix Medium Hash_Table, Math, Randomized, Reservoir_Sampling 39 68.47 0518 Coin Change 2 Medium Array, Dynamic_Programming, Dynamic_Programming_I_Day_20 3 91.32 0517 Super Washing Machines Hard Array, Greedy 0 100.00 0516 Longest Palindromic Subsequence Medium String, Dynamic_Programming, Dynamic_Programming_I_Day_17 31 96.10 0515 Find Largest Value in Each Tree Row Medium Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree 1 96.84 0514 Freedom Trail Hard String, Dynamic_Programming, Depth_First_Search, Breadth_First_Search 17 75.84 0513 Find Bottom Left Tree Value Medium Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree 1 80.06 0511 Game Play Analysis I Easy LeetCode_Curated_SQL_70, Database, SQL_I_Day_8_Function 620 35.70 0509 Fibonacci Number Easy Dynamic_Programming, Math, Recursion, Memoization, Dynamic_Programming_I_Day_1, Level_1_Day_10_Dynamic_Programming 0 100.00 0508 Most Frequent Subtree Sum Medium Hash_Table, Depth_First_Search, Tree, Binary_Tree 6 77.55 0507 Perfect Number Easy Math 2 73.73 0506 Relative Ranks Easy Array, Sorting, Heap_Priority_Queue 4 99.79 0504 Base 7 Easy Math 1 94.93 0503 Next Greater Element II Medium Array, Stack, Monotonic_Stack, Programming_Skills_II_Day_10 7 95.85 0502 IPO Hard Array, Sorting, Greedy, Heap_Priority_Queue 43 92.06 0501 Find Mode in Binary Search Tree Easy Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree 1 91.60 0500 Keyboard Row Easy Array, String, Hash_Table 0 100.00 0498 Diagonal Traverse Medium Array, Matrix, Simulation 2 96.07 0497 Random Point in Non-overlapping Rectangles Medium Math, Binary_Search, Prefix_Sum, Ordered_Set, Randomized, Reservoir_Sampling 44 97.50 0496 Next Greater Element I Easy Array, Hash_Table, Stack, Monotonic_Stack, Programming_Skills_I_Day_5_Function 3 84.97 0495 Teemo Attacking Easy Array, Simulation 4 26.85 0494 Target Sum Medium Top_100_Liked_Questions, Array, Dynamic_Programming, Backtracking 10 82.41 0493 Reverse Pairs Hard Array, Binary_Search, Ordered_Set, Divide_and_Conquer, Segment_Tree, Binary_Indexed_Tree, Merge_Sort 121 31.13 0492 Construct the Rectangle Easy Math 1 74.25 0491 Increasing Subsequences Medium Array, Hash_Table, Bit_Manipulation, Backtracking 22 46.38 0488 Zuma Game Hard String, Dynamic_Programming, Breadth_First_Search, Memoization 2077 7.41 0486 Predict the Winner Medium Array, Dynamic_Programming, Math, Recursion, Game_Theory 0 100.00 0485 Max Consecutive Ones Easy Array 1 100.00 0483 Smallest Good Base Hard Math, Binary_Search 3 87.88 0482 License Key Formatting Easy String 7 98.60 0481 Magical String Medium String, Two_Pointers 5 88.46 0480 Sliding Window Median Hard Array, Hash_Table, Heap_Priority_Queue, Sliding_Window 46 80.65 0479 Largest Palindrome Product Hard Math 6 97.54 0478 Generate Random Point in a Circle Medium Math, Geometry, Randomized, Rejection_Sampling 196 98.10 0477 Total Hamming Distance Medium Array, Math, Bit_Manipulation 5 90.97 0476 Number Complement Easy Bit_Manipulation 0 100.00 0475 Heaters Medium Array, Sorting, Binary_Search, Two_Pointers 8 99.30 0474 Ones and Zeroes Medium Array, String, Dynamic_Programming 41 68.79 0473 Matchsticks to Square Medium Array, Dynamic_Programming, Bit_Manipulation, Backtracking, Bitmask 241 18.95 0472 Concatenated Words Hard Array, String, Dynamic_Programming, Depth_First_Search, Trie 84 79.03 0470 Implement Rand10() Using Rand7() Medium Math, Randomized, Probability_and_Statistics, Rejection_Sampling 10 51.04 0468 Validate IP Address Medium String 1 98.15 0467 Unique Substrings in Wraparound String Medium String, Dynamic_Programming 5 88.61 0466 Count The Repetitions Hard String, Dynamic_Programming 1 100.00 0464 Can I Win Medium Dynamic_Programming, Math, Bit_Manipulation, Bitmask, Memoization, Game_Theory 159 84.80 0463 Island Perimeter Easy Array, Depth_First_Search, Breadth_First_Search, Matrix 9 74.15 0462 Minimum Moves to Equal Array Elements II Medium Array, Math, Sorting 3 94.38 0461 Hamming Distance Easy Bit_Manipulation 1 39.19 0460 LFU Cache Hard Hash_Table, Design, Linked_List, Doubly_Linked_List 45 99.66 0459 Repeated Substring Pattern Easy String, String_Matching, Programming_Skills_II_Day_2 9 90.15 0458 Poor Pigs Hard Dynamic_Programming, Math, Combinatorics 0 100.00 0457 Circular Array Loop Medium Array, Hash_Table, Two_Pointers 2 73.72 0456 132 Pattern Medium Array, Binary_Search, Stack, Ordered_Set, Monotonic_Stack 15 80.22 0455 Assign Cookies Easy Array, Sorting, Greedy 11 42.95 0454 4Sum II Medium Top_Interview_Questions, Array, Hash_Table 157 74.79 0453 Minimum Moves to Equal Array Elements Medium Array, Math 1 100.00 0452 Minimum Number of Arrows to Burst Balloons Medium Array, Sorting, Greedy 80 76.91 0451 Sort Characters By Frequency Medium String, Hash_Table, Sorting, Heap_Priority_Queue, Counting, Bucket_Sort, Data_Structure_II_Day_21_Heap_Priority_Queue 18 70.93 0450 Delete Node in a BST Medium Tree, Binary_Tree, Binary_Search_Tree, Data_Structure_II_Day_16_Tree 0 100.00 0449 Serialize and Deserialize BST Medium String, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Design, Binary_Search_Tree 1 99.70 0448 Find All Numbers Disappeared in an Array Easy Array, Hash_Table 3 100.00 0447 Number of Boomerangs Medium Array, Hash_Table, Math 156 80.44 0446 Arithmetic Slices II - Subsequence Hard Array, Dynamic_Programming 67 95.78 0445 Add Two Numbers II Medium Math, Stack, Linked_List, Programming_Skills_II_Day_15 3 81.96 0443 String Compression Medium String, Two_Pointers 2 60.36 0442 Find All Duplicates in an Array Medium Array, Hash_Table 5 94.88 0441 Arranging Coins Easy Math, Binary_Search, Binary_Search_I_Day_6 2 87.99 0440 K-th Smallest in Lexicographical Order Hard Trie 0 100.00 0438 Find All Anagrams in a String Medium Top_100_Liked_Questions, String, Hash_Table, Sliding_Window, Algorithm_II_Day_5_Sliding_Window, Programming_Skills_II_Day_12, Level_1_Day_12_Sliding_Window/Two_Pointer 8 87.18 0437 Path Sum III Medium Top_100_Liked_Questions, Depth_First_Search, Tree, Binary_Tree 4 87.75 0436 Find Right Interval Medium Array, Sorting, Binary_Search, Binary_Search_II_Day_11 17 87.90 0435 Non-overlapping Intervals Medium Array, Dynamic_Programming, Sorting, Greedy, Data_Structure_II_Day_4_Array 109 26.80 0434 Number of Segments in a String Easy String 0 100.00 0433 Minimum Genetic Mutation Medium String, Hash_Table, Breadth_First_Search, Graph_Theory_I_Day_12_Breadth_First_Search 0 100.00 0432 All O`one Data Structure Hard Hash_Table, Design, Linked_List, Doubly_Linked_List 87 62.81 0430 Flatten a Multilevel Doubly Linked List Medium Depth_First_Search, Linked_List, Doubly_Linked_List 0 100.00 0429 N-ary Tree Level Order Traversal Medium Breadth_First_Search, Tree, Programming_Skills_II_Day_9 4 57.07 0427 Construct Quad Tree Medium Array, Tree, Matrix, Divide_and_Conquer 1 85.16 0424 Longest Repeating Character Replacement Medium String, Hash_Table, Sliding_Window, Level_1_Day_12_Sliding_Window/Two_Pointer 5 92.61 0423 Reconstruct Original Digits from English Medium String, Hash_Table, Math 3 100.00 0421 Maximum XOR of Two Numbers in an Array Medium Array, Hash_Table, Bit_Manipulation, Trie 22 99.22 0420 Strong Password Checker Hard String, Greedy, Heap_Priority_Queue 0 100.00 0419 Battleships in a Board Medium Array, Depth_First_Search, Matrix 1 83.10 0417 Pacific Atlantic Water Flow Medium Array, Depth_First_Search, Breadth_First_Search, Matrix, Graph_Theory_I_Day_4_Matrix_Related_Problems 5 89.66 0416 Partition Equal Subset Sum Medium Top_100_Liked_Questions, Array, Dynamic_Programming 1 99.87 0415 Add Strings Easy String, Math, Simulation, Data_Structure_II_Day_6_String 3 75.64 0414 Third Maximum Number Easy Array, Sorting 1 96.71 0413 Arithmetic Slices Medium Array, Dynamic_Programming, Algorithm_II_Day_14_Dynamic_Programming, Dynamic_Programming_I_Day_10 0 100.00 0412 Fizz Buzz Easy Top_Interview_Questions, String, Math, Simulation 3 32.80 0410 Split Array Largest Sum Hard Array, Dynamic_Programming, Greedy, Binary_Search 1 84.88 0409 Longest Palindrome Easy String, Hash_Table, Greedy, Data_Structure_II_Day_6_String, Level_1_Day_5_Greedy 1 100.00 0407 Trapping Rain Water II Hard Array, Breadth_First_Search, Matrix, Heap_Priority_Queue 10 99.01 0406 Queue Reconstruction by Height Medium Array, Sorting, Greedy, Segment_Tree, Binary_Indexed_Tree 9 74.45 0405 Convert a Number to Hexadecimal Easy Math, Bit_Manipulation 0 100.00 0404 Sum of Left Leaves Easy Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Programming_Skills_I_Day_10_Linked_List_and_Tree 0 100.00 0403 Frog Jump Hard Array, Dynamic_Programming 18 97.19 0402 Remove K Digits Medium String, Greedy, Stack, Monotonic_Stack 6 90.82 0401 Binary Watch Easy Bit_Manipulation, Backtracking 1 98.21 0400 Nth Digit Medium Math, Binary_Search 0 100.00 0399 Evaluate Division Medium Array, Depth_First_Search, Breadth_First_Search, Graph, Union_Find, Shortest_Path 1 97.67 0398 Random Pick Index Medium Hash_Table, Math, Randomized, Reservoir_Sampling 75 74.64 0397 Integer Replacement Medium Dynamic_Programming, Greedy, Bit_Manipulation, Memoization 0 100.00 0396 Rotate Function Medium Array, Dynamic_Programming, Math 3 98.51 0395 Longest Substring with At Least K Repeating Characters Medium Top_Interview_Questions, String, Hash_Table, Sliding_Window, Divide_and_Conquer 0 100.00 0394 Decode String Medium Top_100_Liked_Questions, String, Stack, Recursion, Level_1_Day_14_Stack 1 83.81 0393 UTF-8 Validation Medium Array, Bit_Manipulation 1 100.00 0392 Is Subsequence Easy String, Dynamic_Programming, Two_Pointers, Dynamic_Programming_I_Day_19, Level_1_Day_2_String 0 100.00 0391 Perfect Rectangle Hard Array, Line_Sweep 49 67.32 0390 Elimination Game Medium Math, Recursion 2 100.00 0389 Find the Difference Easy String, Hash_Table, Sorting, Bit_Manipulation, Programming_Skills_I_Day_8_String 1 99.83 0388 Longest Absolute File Path Medium String, Depth_First_Search, Stack 2 52.22 0387 First Unique Character in a String Easy Top_Interview_Questions, String, Hash_Table, Counting, Queue, Data_Structure_I_Day_6_String 2 99.53 0386 Lexicographical Numbers Medium Depth_First_Search, Trie 4 87.17 0385 Mini Parser Medium String, Depth_First_Search, Stack 3 97.44 0384 Shuffle an Array Medium Top_Interview_Questions, Array, Math, Randomized, Algorithm_II_Day_20_Others 65 94.59 0383 Ransom Note Easy String, Hash_Table, Counting, Data_Structure_I_Day_6_String 1 99.79 0382 Linked List Random Node Medium Math, Linked_List, Randomized, Reservoir_Sampling 7 100.00 0381 Insert Delete GetRandom O(1) - Duplicates allowed Hard Array, Hash_Table, Math, Design, Randomized 26 100.00 0380 Insert Delete GetRandom O(1) Medium Top_Interview_Questions, Array, Hash_Table, Math, Design, Randomized, Programming_Skills_II_Day_20 20 99.24 0378 Kth Smallest Element in a Sorted Matrix Medium Top_Interview_Questions, Array, Sorting, Binary_Search, Matrix, Heap_Priority_Queue 0 100.00 0377 Combination Sum IV Medium Array, Dynamic_Programming, Dynamic_Programming_I_Day_21 1 91.72 0376 Wiggle Subsequence Medium Array, Dynamic_Programming, Greedy, Dynamic_Programming_I_Day_18 0 100.00 0375 Guess Number Higher or Lower II Medium Dynamic_Programming, Math, Game_Theory 1 100.00 0374 Guess Number Higher or Lower Easy Binary_Search, Interactive, Binary_Search_I_Day_1 0 100.00 0373 Find K Pairs with Smallest Sums Medium Array, Heap_Priority_Queue 58 29.29 0372 Super Pow Medium Math, Divide_and_Conquer 2 91.10 0371 Sum of Two Integers Medium Top_Interview_Questions, Math, Bit_Manipulation 0 100.00 0368 Largest Divisible Subset Medium Array, Dynamic_Programming, Math, Sorting 20 87.61 0367 Valid Perfect Square Easy Math, Binary_Search, Binary_Search_I_Day_3 0 100.00 0365 Water and Jug Problem Medium Math, Depth_First_Search, Breadth_First_Search, Graph_Theory_I_Day_11_Breadth_First_Search 0 100.00 0363 Max Sum of Rectangle No Larger Than K Hard Array, Dynamic_Programming, Binary_Search, Matrix, Ordered_Set 69 97.33 0357 Count Numbers with Unique Digits Medium Dynamic_Programming, Math, Backtracking 0 100.00 0355 Design Twitter Medium Hash_Table, Design, Heap_Priority_Queue, Linked_List 8 99.79 0354 Russian Doll Envelopes Hard Array, Dynamic_Programming, Sorting, Binary_Search 65 67.49 0352 Data Stream as Disjoint Intervals Hard Binary_Search, Design, Ordered_Set 94 76.26 0350 Intersection of Two Arrays II Easy Top_Interview_Questions, Array, Hash_Table, Sorting, Binary_Search, Two_Pointers, Data_Structure_I_Day_3_Array, Binary_Search_I_Day_10 3 81.79 0349 Intersection of Two Arrays Easy Array, Hash_Table, Sorting, Binary_Search, Two_Pointers 1 99.75 0347 Top K Frequent Elements Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Sorting, Heap_Priority_Queue, Counting, Divide_and_Conquer, Quickselect, Bucket_Sort, Data_Structure_II_Day_20_Heap_Priority_Queue 7 99.54 0345 Reverse Vowels of a String Easy String, Two_Pointers 4 86.90 0344 Reverse String Easy Top_Interview_Questions, String, Two_Pointers, Recursion, Algorithm_I_Day_4_Two_Pointers 1 87.94 0343 Integer Break Medium Dynamic_Programming, Math, Algorithm_II_Day_18_Dynamic_Programming, Dynamic_Programming_I_Day_21 0 100.00 0342 Power of Four Easy Math, Bit_Manipulation, Recursion 1 91.73 0341 Flatten Nested List Iterator Medium Top_Interview_Questions, Depth_First_Search, Tree, Stack, Design, Queue, Iterator, Programming_Skills_II_Day_18 3 86.51 0338 Counting Bits Easy Top_100_Liked_Questions, Dynamic_Programming, Bit_Manipulation 1 99.97 0337 House Robber III Medium Dynamic_Programming, Depth_First_Search, Tree, Binary_Tree 1 87.96 0336 Palindrome Pairs Hard Array, String, Hash_Table, Trie 1219 54.97 0335 Self Crossing Hard Array, Math, Geometry 6 44.12 0334 Increasing Triplet Subsequence Medium Top_Interview_Questions, Array, Greedy, Data_Structure_II_Day_5_Array 3 61.85 0332 Reconstruct Itinerary Hard Depth_First_Search, Graph, Eulerian_Circuit 11 47.68 0331 Verify Preorder Serialization of a Binary Tree Medium String, Tree, Binary_Tree, Stack 3 94.01 0330 Patching Array Hard Array, Greedy 0 100.00 0329 Longest Increasing Path in a Matrix Hard Top_Interview_Questions, Dynamic_Programming, Depth_First_Search, Breadth_First_Search, Graph, Memoization, Topological_Sort 8 91.02 0328 Odd Even Linked List Medium Top_Interview_Questions, Linked_List 0 100.00 0327 Count of Range Sum Hard Array, Binary_Search, Ordered_Set, Divide_and_Conquer, Segment_Tree, Binary_Indexed_Tree, Merge_Sort 64 87.41 0326 Power of Three Easy Top_Interview_Questions, Math, Recursion 18 79.91 0324 Wiggle Sort II Medium Top_Interview_Questions, Array, Sorting, Divide_and_Conquer, Quickselect 6 69.23 0322 Coin Change Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Breadth_First_Search, Algorithm_II_Day_18_Dynamic_Programming, Dynamic_Programming_I_Day_20 22 72.14 0321 Create Maximum Number Hard Greedy, Stack, Monotonic_Stack 9 93.46 0319 Bulb Switcher Medium Math, Brainteaser 0 100.00 0318 Maximum Product of Word Lengths Medium Array, String, Bit_Manipulation 10 81.97 0316 Remove Duplicate Letters Medium String, Greedy, Stack, Monotonic_Stack 2 98.39 0315 Count of Smaller Numbers After Self Hard Top_Interview_Questions, Array, Binary_Search, Ordered_Set, Divide_and_Conquer, Segment_Tree, Binary_Indexed_Tree, Merge_Sort 34 96.38 0313 Super Ugly Number Medium Array, Dynamic_Programming, Math 280 86.61 0312 Burst Balloons Hard Array, Dynamic_Programming 53 86.06 0310 Minimum Height Trees Medium Depth_First_Search, Breadth_First_Search, Graph, Topological_Sort 22 94.43 0309 Best Time to Buy and Sell Stock with Cooldown Medium Array, Dynamic_Programming, Dynamic_Programming_I_Day_8 0 100.00 0307 Range Sum Query - Mutable Medium Array, Design, Segment_Tree, Binary_Indexed_Tree 61 98.40 0306 Additive Number Medium String, Backtracking 1 87.31 0304 Range Sum Query 2D - Immutable Medium Array, Matrix, Design, Prefix_Sum, Dynamic_Programming_I_Day_14, Programming_Skills_II_Day_13 103 98.60 0303 Range Sum Query - Immutable Easy Array, Design, Prefix_Sum, Programming_Skills_I_Day_12_Class_and_Object 6 100.00 0301 Remove Invalid Parentheses Hard String, Breadth_First_Search, Backtracking 4 86.17 0300 Longest Increasing Subsequence Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Binary_Search, Algorithm_II_Day_16_Dynamic_Programming, Binary_Search_II_Day_3, Dynamic_Programming_I_Day_18 3 96.86 0299 Bulls and Cows Medium String, Hash_Table, Counting, Level_1_Day_13_Hashmap 8 67.24 0297 Serialize and Deserialize Binary Tree Hard Top_Interview_Questions, String, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Design, Data_Structure_II_Day_18_Tree 9 91.82 0295 Find Median from Data Stream Hard Top_100_Liked_Questions, Top_Interview_Questions, Sorting, Two_Pointers, Design, Heap_Priority_Queue, Data_Stream 88 98.03 0292 Nim Game Easy Math, Game_Theory, Brainteaser 0 100.00 0290 Word Pattern Easy String, Hash_Table, Data_Structure_II_Day_7_String 1 91.62 0289 Game of Life Medium Top_Interview_Questions, Array, Matrix, Simulation 0 100.00 0287 Find the Duplicate Number Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search, Two_Pointers, Bit_Manipulation, Binary_Search_II_Day_5 4 94.82 0284 Peeking Iterator Medium Array, Design, Iterator 5 78.72 0283 Move Zeroes Easy Top_100_Liked_Questions, Top_Interview_Questions, Array, Two_Pointers, Algorithm_I_Day_3_Two_Pointers, Programming_Skills_I_Day_6_Array 2 74.00 0282 Expression Add Operators Hard String, Math, Backtracking 7 99.73 0279 Perfect Squares Medium Top_Interview_Questions, Dynamic_Programming, Math, Breadth_First_Search, Dynamic_Programming_I_Day_21 0 100.00 0278 First Bad Version Easy Binary_Search, Interactive, Algorithm_I_Day_1_Binary_Search, Binary_Search_I_Day_5, Level_1_Day_7_Binary_Search 12 99.50 0275 H-Index II Medium Array, Binary_Search, Binary_Search_II_Day_8 0 100.00 0274 H-Index Medium Array, Sorting, Counting_Sort 2 51.85 0273 Integer to English Words Hard String, Math, Recursion 5 83.37 0268 Missing Number Easy Top_Interview_Questions, Array, Hash_Table, Math, Sorting, Binary_Search, Bit_Manipulation 0 100.00 0264 Ugly Number II Medium Hash_Table, Dynamic_Programming, Math, Heap_Priority_Queue, Dynamic_Programming_I_Day_11 3 88.43 0263 Ugly Number Easy Math 1 95.93 0262 Trips and Users Hard Database 449 79.92 0260 Single Number III Medium Array, Bit_Manipulation 1 98.18 0258 Add Digits Easy Math, Simulation, Number_Theory 1 95.33 0257 Binary Tree Paths Easy String, Depth_First_Search, Tree, Binary_Tree, Backtracking 2 91.59 0242 Valid Anagram Easy Top_Interview_Questions, String, Hash_Table, Sorting, Data_Structure_I_Day_6_String, Programming_Skills_I_Day_11_Containers_and_Libraries 2 98.88 0241 Different Ways to Add Parentheses Medium String, Dynamic_Programming, Math, Recursion, Memoization 2 81.46 0240 Search a 2D Matrix II Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search, Matrix, Divide_and_Conquer, Data_Structure_II_Day_4_Array, Binary_Search_II_Day_8 9 71.40 0239 Sliding Window Maximum Hard Top_100_Liked_Questions, Top_Interview_Questions, Array, Heap_Priority_Queue, Sliding_Window, Queue, Monotonic_Queue 25 95.01 0238 Product of Array Except Self Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Prefix_Sum, Data_Structure_II_Day_5_Array 1 100.00 0237 Delete Node in a Linked List Easy Top_Interview_Questions, Linked_List 0 100.00 0236 Lowest Common Ancestor of a Binary Tree Medium Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Tree, Binary_Tree, Data_Structure_II_Day_18_Tree 11 46.61 0235 Lowest Common Ancestor of a Binary Search Tree Easy Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree, Data_Structure_I_Day_14_Tree, Level_1_Day_8_Binary_Search_Tree 7 52.79 0234 Palindrome Linked List Easy Top_100_Liked_Questions, Top_Interview_Questions, Two_Pointers, Stack, Linked_List, Recursion 5 89.76 0233 Number of Digit One Hard Dynamic_Programming, Math, Recursion 0 100.00 0232 Implement Queue using Stacks Easy Stack, Design, Queue, Data_Structure_I_Day_9_Stack_Queue, Programming_Skills_I_Day_11_Containers_and_Libraries 1 56.63 0231 Power of Two Easy Math, Bit_Manipulation, Recursion, Algorithm_I_Day_13_Bit_Manipulation 1 95.76 0230 Kth Smallest Element in a BST Medium Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree, Data_Structure_II_Day_17_Tree 0 100.00 0229 Majority Element II Medium Array, Hash_Table, Sorting, Counting 2 91.84 0228 Summary Ranges Easy Array 0 100.00 0227 Basic Calculator II Medium Top_Interview_Questions, String, Math, Stack 9 88.15 0226 Invert Binary Tree Easy Top_100_Liked_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Data_Structure_I_Day_12_Tree 0 100.00 0225 Implement Stack using Queues Easy Stack, Design, Queue 0 100.00 0224 Basic Calculator Hard String, Math, Stack, Recursion 3 98.82 0223 Rectangle Area Medium Math, Geometry 2 99.58 0222 Count Complete Tree Nodes Medium Depth_First_Search, Tree, Binary_Search, Binary_Tree, Binary_Search_II_Day_10 0 100.00 0221 Maximal Square Medium Top_100_Liked_Questions, Array, Dynamic_Programming, Matrix, Dynamic_Programming_I_Day_16 6 80.89 0220 Contains Duplicate III Medium Array, Sorting, Sliding_Window, Ordered_Set, Bucket_Sort 46 62.24 0219 Contains Duplicate II Easy Array, Hash_Table, Sliding_Window 44 42.18 0218 The Skyline Problem Hard Top_Interview_Questions, Array, Heap_Priority_Queue, Ordered_Set, Divide_and_Conquer, Segment_Tree, Binary_Indexed_Tree, Line_Sweep 21 80.36 0217 Contains Duplicate Easy Top_Interview_Questions, Array, Hash_Table, Sorting, Data_Structure_I_Day_1_Array, Programming_Skills_I_Day_11_Containers_and_Libraries 10 67.20 0216 Combination Sum III Medium Array, Backtracking 1 78.74 0215 Kth Largest Element in an Array Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Heap_Priority_Queue, Divide_and_Conquer, Quickselect, Data_Structure_II_Day_20_Heap_Priority_Queue 2 93.01 0214 Shortest Palindrome Hard String, Hash_Function, String_Matching, Rolling_Hash 3 94.71 0213 House Robber II Medium Array, Dynamic_Programming, Algorithm_II_Day_12_Dynamic_Programming, Dynamic_Programming_I_Day_3 1 31.05 0212 Word Search II Hard Top_Interview_Questions, Array, String, Matrix, Backtracking, Trie 20 96.11 0211 Design Add and Search Words Data Structure Medium String, Depth_First_Search, Design, Trie 403 18.89 0210 Course Schedule II Medium Top_Interview_Questions, Depth_First_Search, Breadth_First_Search, Graph, Topological_Sort 7 74.90 0209 Minimum Size Subarray Sum Medium Array, Binary_Search, Prefix_Sum, Sliding_Window, Algorithm_II_Day_5_Sliding_Window, Binary_Search_II_Day_1 1 99.98 0208 Implement Trie (Prefix Tree) Medium Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Design, Trie 63 55.40 0207 Course Schedule Medium Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Breadth_First_Search, Graph, Topological_Sort 2 99.76 0206 Reverse Linked List Easy Top_100_Liked_Questions, Top_Interview_Questions, Linked_List, Recursion, Data_Structure_I_Day_8_Linked_List, Algorithm_I_Day_10_Recursion_Backtracking, Level_1_Day_3_Linked_List 0 100.00 0205 Isomorphic Strings Easy String, Hash_Table, Level_1_Day_2_String 1 100.00 0204 Count Primes Medium Top_Interview_Questions, Array, Math, Enumeration, Number_Theory 146 72.74 0203 Remove Linked List Elements Easy Linked_List, Recursion, Data_Structure_I_Day_7_Linked_List 1 90.35 0202 Happy Number Easy Top_Interview_Questions, Hash_Table, Math, Two_Pointers, Algorithm_II_Day_21_Others, Programming_Skills_I_Day_4_Loop 1 93.34 0201 Bitwise AND of Numbers Range Medium Bit_Manipulation, Algorithm_II_Day_19_Bit_Manipulation 10 40.99 0200 Number of Islands Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find, Algorithm_II_Day_6_Breadth_First_Search_Depth_First_Search, Graph_Theory_I_Day_1_Matrix_Related_Problems, Level_1_Day_9_Graph/BFS/DFS 4 73.02 0199 Binary Tree Right Side View Medium Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Data_Structure_II_Day_16_Tree 1 92.96 0198 House Robber Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Algorithm_I_Day_12_Dynamic_Programming, Dynamic_Programming_I_Day_3 0 100.00 0197 Rising Temperature Easy Database, SQL_I_Day_6_Union 401 79.45 0196 Delete Duplicate Emails Easy Database, SQL_I_Day_2_Select_and_Order 541 81.09 0195 Tenth Line Easy Shell 4 93.33 0194 Transpose File Medium Shell 0 100.00 0193 Valid Phone Numbers Easy Shell 129 42.86 0192 Word Frequency Medium Shell 152 38.56 0191 Number of 1 Bits Easy Top_Interview_Questions, Bit_Manipulation, Algorithm_I_Day_13_Bit_Manipulation, Programming_Skills_I_Day_2_Operator 0 100.00 0190 Reverse Bits Easy Top_Interview_Questions, Bit_Manipulation, Divide_and_Conquer, Algorithm_I_Day_14_Bit_Manipulation 1 98.66 0189 Rotate Array Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Math, Two_Pointers, Algorithm_I_Day_2_Two_Pointers 0 100.00 0188 Best Time to Buy and Sell Stock IV Hard Array, Dynamic_Programming 1 100.00 0187 Repeated DNA Sequences Medium String, Hash_Table, Bit_Manipulation, Sliding_Window, Hash_Function, Rolling_Hash, Data_Structure_II_Day_9_String 29 77.11 0185 Department Top Three Salaries Hard Database 643 95.52 0184 Department Highest Salary Medium Database 590 73.49 0183 Customers Who Never Order Easy Database, SQL_I_Day_1_Select 376 98.73 0182 Duplicate Emails Easy Database, SQL_I_Day_10_Where 303 92.08 0181 Employees Earning More Than Their Managers Easy Database 315 94.44 0180 Consecutive Numbers Medium Database 550 48.44 0179 Largest Number Medium Top_Interview_Questions, String, Sorting, Greedy 10 54.50 0178 Rank Scores Medium Database 290 66.73 0177 Nth Highest Salary Medium Database 342 71.87 0176 Second Highest Salary Medium Database, SQL_I_Day_4_Union_and_Select 405 13.88 0175 Combine Two Tables Easy Database, SQL_I_Day_5_Union 491 32.30 0174 Dungeon Game Hard Array, Dynamic_Programming, Matrix 0 100.00 0173 Binary Search Tree Iterator Medium Tree, Binary_Tree, Stack, Design, Binary_Search_Tree, Iterator, Data_Structure_II_Day_17_Tree, Programming_Skills_II_Day_16 18 84.18 0172 Factorial Trailing Zeroes Medium Top_Interview_Questions, Math 1 85.61 0171 Excel Sheet Column Number Easy Top_Interview_Questions, String, Math 2 76.43 0169 Majority Element Easy Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Sorting, Counting, Divide_and_Conquer, Data_Structure_II_Day_1_Array 1 100.00 0168 Excel Sheet Column Title Easy String, Math 0 100.00 0167 Two Sum II - Input Array Is Sorted Medium Array, Binary_Search, Two_Pointers, Algorithm_I_Day_3_Two_Pointers, Binary_Search_I_Day_7 1 99.21 0166 Fraction to Recurring Decimal Medium Top_Interview_Questions, String, Hash_Table, Math 3 55.19 0165 Compare Version Numbers Medium String, Two_Pointers 1 88.88 0164 Maximum Gap Hard Array, Sorting, Bucket_Sort, Radix_Sort 48 53.59 0162 Find Peak Element Medium Top_Interview_Questions, Array, Binary_Search, Algorithm_II_Day_2_Binary_Search, Binary_Search_II_Day_12 0 100.00 0160 Intersection of Two Linked Lists Easy Top_100_Liked_Questions, Top_Interview_Questions, Hash_Table, Two_Pointers, Linked_List, Data_Structure_II_Day_11_Linked_List 1 99.68 0155 Min Stack Easy Top_100_Liked_Questions, Top_Interview_Questions, Stack, Design, Data_Structure_II_Day_14_Stack_Queue, Programming_Skills_II_Day_18 3 100.00 0154 Find Minimum in Rotated Sorted Array II Hard Array, Binary_Search, Binary_Search_II_Day_13 1 77.09 0153 Find Minimum in Rotated Sorted Array Medium Top_100_Liked_Questions, Array, Binary_Search, Algorithm_II_Day_2_Binary_Search, Binary_Search_I_Day_12 0 100.00 0152 Maximum Product Subarray Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Dynamic_Programming_I_Day_6 0 100.00 0151 Reverse Words in a String Medium String, Two_Pointers 2 99.94 0150 Evaluate Reverse Polish Notation Medium Top_Interview_Questions, Array, Math, Stack, Programming_Skills_II_Day_3 9 51.23 0149 Max Points on a Line Hard Top_Interview_Questions, Array, Hash_Table, Math, Geometry, Algorithm_II_Day_21_Others 11 99.21 0148 Sort List Medium Top_100_Liked_Questions, Top_Interview_Questions, Sorting, Two_Pointers, Linked_List, Divide_and_Conquer, Merge_Sort 12 85.82 0147 Insertion Sort List Medium Sorting, Linked_List 4 90.34 0146 LRU Cache Medium Top_100_Liked_Questions, Top_Interview_Questions, Hash_Table, Design, Linked_List, Doubly_Linked_List 87 50.80 0145 Binary Tree Postorder Traversal Easy Depth_First_Search, Tree, Binary_Tree, Stack, Data_Structure_I_Day_10_Tree 1 49.11 0144 Binary Tree Preorder Traversal Easy Depth_First_Search, Tree, Binary_Tree, Stack, Data_Structure_I_Day_10_Tree 1 48.38 0143 Reorder List Medium Two_Pointers, Stack, Linked_List, Recursion, Data_Structure_II_Day_13_Linked_List, Programming_Skills_II_Day_14 2 72.59 0142 Linked List Cycle II Medium Top_100_Liked_Questions, Hash_Table, Two_Pointers, Linked_List, Data_Structure_II_Day_10_Linked_List, Level_1_Day_4_Linked_List 0 100.00 0141 Linked List Cycle Easy Top_100_Liked_Questions, Top_Interview_Questions, Hash_Table, Two_Pointers, Linked_List, Data_Structure_I_Day_7_Linked_List 0 100.00 0140 Word Break II Hard Top_Interview_Questions, String, Hash_Table, Dynamic_Programming, Backtracking, Trie, Memoization 1 99.05 0139 Word Break Medium Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Dynamic_Programming, Trie, Memoization, Algorithm_II_Day_15_Dynamic_Programming, Dynamic_Programming_I_Day_9 2 97.08 0138 Copy List with Random Pointer Medium Top_100_Liked_Questions, Top_Interview_Questions, Hash_Table, Linked_List, Programming_Skills_II_Day_14 0 100.00 0137 Single Number II Medium Array, Bit_Manipulation 0 100.00 0136 Single Number Easy Top_100_Liked_Questions, Top_Interview_Questions, Array, Bit_Manipulation, Data_Structure_II_Day_1_Array, Algorithm_I_Day_14_Bit_Manipulation 1 99.97 0135 Candy Hard Array, Greedy 2 99.95 0134 Gas Station Medium Top_Interview_Questions, Array, Greedy 2 94.26 0133 Clone Graph Medium Hash_Table, Depth_First_Search, Breadth_First_Search, Graph 45 29.80 0132 Palindrome Partitioning II Hard String, Dynamic_Programming 2 99.89 0131 Palindrome Partitioning Medium Top_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming, Backtracking 16 65.63 0130 Surrounded Regions Medium Top_Interview_Questions, Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find, Algorithm_II_Day_8_Breadth_First_Search_Depth_First_Search 2 84.66 0129 Sum Root to Leaf Numbers Medium Depth_First_Search, Tree, Binary_Tree 0 100.00 0128 Longest Consecutive Sequence Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Union_Find 18 91.05 0127 Word Ladder Hard Top_Interview_Questions, String, Hash_Table, Breadth_First_Search, Graph_Theory_I_Day_12_Breadth_First_Search 37 94.58 0126 Word Ladder II Hard String, Hash_Table, Breadth_First_Search, Backtracking 4 99.18 0125 Valid Palindrome Easy Top_Interview_Questions, String, Two_Pointers 3 98.64 0124 Binary Tree Maximum Path Sum Hard Top_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Depth_First_Search, Tree, Binary_Tree 1 99.46 0123 Best Time to Buy and Sell Stock III Hard Array, Dynamic_Programming 4 87.18 0122 Best Time to Buy and Sell Stock II Medium Top_Interview_Questions, Array, Dynamic_Programming, Greedy, Dynamic_Programming_I_Day_7 1 96.82 0121 Best Time to Buy and Sell Stock Easy Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Data_Structure_I_Day_3_Array, Dynamic_Programming_I_Day_7, Level_1_Day_5_Greedy 1 100.00 0120 Triangle Medium Array, Dynamic_Programming, Algorithm_I_Day_12_Dynamic_Programming, Dynamic_Programming_I_Day_13 2 94.63 0119 Pascal's Triangle II Easy Array, Dynamic_Programming, Data_Structure_II_Day_3_Array, Dynamic_Programming_I_Day_12 0 100.00 0118 Pascal's Triangle Easy Top_Interview_Questions, Array, Dynamic_Programming, Data_Structure_I_Day_4_Array, Dynamic_Programming_I_Day_12 1 67.08 0117 Populating Next Right Pointers in Each Node II Medium Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Linked_List, Algorithm_II_Day_7_Breadth_First_Search_Depth_First_Search 0 100.00 0116 Populating Next Right Pointers in Each Node Medium Top_Interview_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Linked_List, Algorithm_I_Day_8_Breadth_First_Search_Depth_First_Search 0 100.00 0115 Distinct Subsequences Hard String, Dynamic_Programming 2 100.00 0114 Flatten Binary Tree to Linked List Medium Top_100_Liked_Questions, Depth_First_Search, Tree, Binary_Tree, Stack, Linked_List 1 75.27 0113 Path Sum II Medium Depth_First_Search, Tree, Binary_Tree, Backtracking, Data_Structure_II_Day_16_Tree 1 100.00 0112 Path Sum Easy Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Data_Structure_I_Day_12_Tree 0 100.00 0111 Minimum Depth of Binary Tree Easy Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree 1 97.49 0110 Balanced Binary Tree Easy Depth_First_Search, Tree, Binary_Tree, Programming_Skills_II_Day_2 1 98.82 0109 Convert Sorted List to Binary Search Tree Medium Tree, Binary_Tree, Linked_List, Binary_Search_Tree, Divide_and_Conquer 1 87.04 0108 Convert Sorted Array to Binary Search Tree Easy Top_Interview_Questions, Array, Tree, Binary_Tree, Binary_Search_Tree, Divide_and_Conquer, Data_Structure_II_Day_15_Tree 0 100.00 0107 Binary Tree Level Order Traversal II Medium Breadth_First_Search, Tree, Binary_Tree 1 97.71 0106 Construct Binary Tree from Inorder and Postorder Traversal Medium Array, Hash_Table, Tree, Binary_Tree, Divide_and_Conquer 1 100.00 0105 Construct Binary Tree from Preorder and Inorder Traversal Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Tree, Binary_Tree, Divide_and_Conquer, Data_Structure_II_Day_15_Tree 3 86.35 0104 Maximum Depth of Binary Tree Easy Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Data_Structure_I_Day_11_Tree, Programming_Skills_I_Day_10_Linked_List_and_Tree 0 100.00 0103 Binary Tree Zigzag Level Order Traversal Medium Top_Interview_Questions, Breadth_First_Search, Tree, Binary_Tree, Data_Structure_II_Day_15_Tree 1 95.00 0102 Binary Tree Level Order Traversal Medium Top_100_Liked_Questions, Top_Interview_Questions, Breadth_First_Search, Tree, Binary_Tree, Data_Structure_I_Day_11_Tree, Level_1_Day_6_Tree 1 91.09 0101 Symmetric Tree Easy Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Data_Structure_I_Day_11_Tree 0 100.00 0100 Same Tree Easy Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree 0 100.00 0099 Recover Binary Search Tree Medium Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree 3 76.33 0098 Validate Binary Search Tree Medium Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree, Data_Structure_I_Day_14_Tree, Level_1_Day_8_Binary_Search_Tree 0 100.00 0097 Interleaving String Medium String, Dynamic_Programming 2 88.01 0096 Unique Binary Search Trees Medium Top_100_Liked_Questions, Dynamic_Programming, Math, Tree, Binary_Tree, Binary_Search_Tree, Dynamic_Programming_I_Day_11 0 100.00 0095 Unique Binary Search Trees II Medium Dynamic_Programming, Tree, Binary_Tree, Backtracking, Binary_Search_Tree 1 99.82 0094 Binary Tree Inorder Traversal Easy Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Tree, Binary_Tree, Stack, Data_Structure_I_Day_10_Tree 0 100.00 0093 Restore IP Addresses Medium String, Backtracking 13 24.23 0092 Reverse Linked List II Medium Linked_List 0 100.00 0091 Decode Ways Medium Top_Interview_Questions, String, Dynamic_Programming, Algorithm_II_Day_15_Dynamic_Programming, Dynamic_Programming_I_Day_10 2 66.37 0090 Subsets II Medium Array, Bit_Manipulation, Backtracking, Algorithm_II_Day_9_Recursion_Backtracking 2 82.94 0089 Gray Code Medium Math, Bit_Manipulation, Backtracking 3 98.59 0088 Merge Sorted Array Easy Top_Interview_Questions, Array, Sorting, Two_Pointers, Data_Structure_I_Day_2_Array 0 100.00 0087 Scramble String Hard String, Dynamic_Programming 16 70.62 0086 Partition List Medium Two_Pointers, Linked_List 1 62.66 0085 Maximal Rectangle Hard Array, Dynamic_Programming, Matrix, Stack, Monotonic_Stack 3 99.68 0084 Largest Rectangle in Histogram Hard Top_100_Liked_Questions, Top_Interview_Questions, Array, Stack, Monotonic_Stack 11 98.34 0083 Remove Duplicates from Sorted List Easy Linked_List, Data_Structure_I_Day_8_Linked_List 0 100.00 0082 Remove Duplicates from Sorted List II Medium Two_Pointers, Linked_List, Data_Structure_II_Day_11_Linked_List, Algorithm_II_Day_3_Two_Pointers 0 100.00 0081 Search in Rotated Sorted Array II Medium Array, Binary_Search, Binary_Search_II_Day_12 1 82.83 0080 Remove Duplicates from Sorted Array II Medium Array, Two_Pointers 1 82.32 0079 Word Search Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Matrix, Backtracking, Algorithm_II_Day_11_Recursion_Backtracking 135 70.56 0078 Subsets Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Bit_Manipulation, Backtracking, Algorithm_II_Day_9_Recursion_Backtracking 1 87.15 0077 Combinations Medium Backtracking, Algorithm_I_Day_11_Recursion_Backtracking 5 90.06 0076 Minimum Window Substring Hard Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Sliding_Window 3 98.22 0075 Sort Colors Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Two_Pointers, Data_Structure_II_Day_2_Array 0 100.00 0074 Search a 2D Matrix Medium Top_100_Liked_Questions, Array, Binary_Search, Matrix, Data_Structure_I_Day_5_Array, Algorithm_II_Day_1_Binary_Search, Binary_Search_I_Day_8 0 100.00 0073 Set Matrix Zeroes Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Matrix 1 96.39 0072 Edit Distance Hard Top_100_Liked_Questions, String, Dynamic_Programming, Algorithm_II_Day_18_Dynamic_Programming, Dynamic_Programming_I_Day_19 6 90.49 0071 Simplify Path Medium String, Stack 4 95.43 0070 Climbing Stairs Easy Top_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Math, Memoization, Algorithm_I_Day_12_Dynamic_Programming, Dynamic_Programming_I_Day_2, Level_1_Day_10_Dynamic_Programming 0 100.00 0069 Sqrt(x) Easy Top_Interview_Questions, Math, Binary_Search, Binary_Search_I_Day_4 2 79.35 0068 Text Justification Hard Array, String, Simulation 0 100.00 0067 Add Binary Easy String, Math, Bit_Manipulation, Simulation, Programming_Skills_II_Day_5 2 88.95 0066 Plus One Easy Top_Interview_Questions, Array, Math, Programming_Skills_II_Day_3 0 100.00 0065 Valid Number Hard String 1 100.00 0064 Minimum Path Sum Medium Top_100_Liked_Questions, Array, Dynamic_Programming, Matrix, Dynamic_Programming_I_Day_16 1 99.94 0063 Unique Paths II Medium Array, Dynamic_Programming, Matrix, Dynamic_Programming_I_Day_15 0 100.00 0062 Unique Paths Medium Top_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Math, Combinatorics, Algorithm_II_Day_13_Dynamic_Programming, Dynamic_Programming_I_Day_15, Level_1_Day_11_Dynamic_Programming 1 46.91 0061 Rotate List Medium Two_Pointers, Linked_List, Programming_Skills_II_Day_16 0 100.00 0060 Permutation Sequence Hard Math, Recursion 1 99.90 0059 Spiral Matrix II Medium Array, Matrix, Simulation, Data_Structure_II_Day_3_Array 0 100.00 0058 Length of Last Word Easy String, Programming_Skills_II_Day_6 0 100.00 0057 Insert Interval Medium Array 2 76.42 0056 Merge Intervals Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Data_Structure_II_Day_2_Array 13 55.73 0055 Jump Game Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Greedy, Algorithm_II_Day_12_Dynamic_Programming, Dynamic_Programming_I_Day_4 2 89.91 0054 Spiral Matrix Medium Top_Interview_Questions, Array, Matrix, Simulation, Programming_Skills_II_Day_8 0 100.00 0053 Maximum Subarray Easy Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Divide_and_Conquer, Data_Structure_I_Day_1_Array, Dynamic_Programming_I_Day_5 2 63.61 0052 N-Queens II Hard Backtracking 1 97.55 0051 N-Queens Hard Top_100_Liked_Questions, Array, Backtracking 1 100.00 0050 Pow(x, n) Medium Top_Interview_Questions, Math, Recursion 1 82.34 0049 Group Anagrams Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, String, Hash_Table, Sorting, Data_Structure_II_Day_8_String, Programming_Skills_II_Day_11 11 71.16 0048 Rotate Image Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Math, Matrix, Data_Structure_II_Day_3_Array, Programming_Skills_II_Day_7 0 100.00 0047 Permutations II Medium Array, Backtracking, Algorithm_II_Day_10_Recursion_Backtracking 2 93.29 0046 Permutations Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Backtracking, Algorithm_I_Day_11_Recursion_Backtracking 1 97.24 0045 Jump Game II Medium Top_100_Liked_Questions, Array, Dynamic_Programming, Greedy, Algorithm_II_Day_13_Dynamic_Programming, Dynamic_Programming_I_Day_4 2 75.75 0044 Wildcard Matching Hard Top_Interview_Questions, String, Dynamic_Programming, Greedy, Recursion 4 90.87 0043 Multiply Strings Medium String, Math, Simulation, Data_Structure_II_Day_8_String, Programming_Skills_II_Day_4 2 99.84 0042 Trapping Rain Water Hard Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Two_Pointers, Stack, Monotonic_Stack, Dynamic_Programming_I_Day_9 1 98.06 0041 First Missing Positive Hard Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table 5 50.34 0040 Combination Sum II Medium Array, Backtracking, Algorithm_II_Day_10_Recursion_Backtracking 4 86.03 0039 Combination Sum Medium Top_100_Liked_Questions, Array, Backtracking, Algorithm_II_Day_10_Recursion_Backtracking 3 92.97 0038 Count and Say Medium Top_Interview_Questions, String 2 99.52 0037 Sudoku Solver Hard Array, Matrix, Backtracking 3 98.89 0036 Valid Sudoku Medium Top_Interview_Questions, Array, Hash_Table, Matrix, Data_Structure_I_Day_5_Array 2 95.85 0035 Search Insert Position Easy Top_100_Liked_Questions, Array, Binary_Search, Algorithm_I_Day_1_Binary_Search, Binary_Search_I_Day_2 0 100.00 0034 Find First and Last Position of Element in Sorted Array Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search, Algorithm_II_Day_1_Binary_Search, Binary_Search_I_Day_5 0 100.00 0033 Search in Rotated Sorted Array Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search, Algorithm_II_Day_1_Binary_Search, Binary_Search_I_Day_11 0 100.00 0032 Longest Valid Parentheses Hard Top_100_Liked_Questions, String, Dynamic_Programming, Stack 2 93.91 0031 Next Permutation Medium Top_100_Liked_Questions, Array, Two_Pointers 1 85.59 0030 Substring with Concatenation of All Words Hard String, Hash_Table, Sliding_Window 9 97.68 0029 Divide Two Integers Medium Top_Interview_Questions, Math, Bit_Manipulation 1 99.96 0028 Implement strStr() Easy Top_Interview_Questions, String, Two_Pointers, String_Matching, Programming_Skills_II_Day_1 0 100.00 0027 Remove Element Easy Array, Two_Pointers 0 100.00 0026 Remove Duplicates from Sorted Array Easy Top_Interview_Questions, Array, Two_Pointers 1 99.47 0025 Reverse Nodes in k-Group Hard Top_100_Liked_Questions, Linked_List, Recursion, Data_Structure_II_Day_13_Linked_List 0 100.00 0024 Swap Nodes in Pairs Medium Top_100_Liked_Questions, Linked_List, Recursion, Data_Structure_II_Day_12_Linked_List 0 100.00 0023 Merge k Sorted Lists Hard Top_100_Liked_Questions, Top_Interview_Questions, Heap_Priority_Queue, Linked_List, Divide_and_Conquer, Merge_Sort 2 97.31 0022 Generate Parentheses Medium Top_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming, Backtracking, Algorithm_II_Day_11_Recursion_Backtracking 2 63.16 0021 Merge Two Sorted Lists Easy Top_100_Liked_Questions, Top_Interview_Questions, Linked_List, Recursion, Data_Structure_I_Day_7_Linked_List, Algorithm_I_Day_10_Recursion_Backtracking, Level_1_Day_3_Linked_List 1 69.17 0020 Valid Parentheses Easy Top_100_Liked_Questions, Top_Interview_Questions, String, Stack, Data_Structure_I_Day_9_Stack_Queue 3 51.72 0019 Remove Nth Node From End of List Medium Top_100_Liked_Questions, Top_Interview_Questions, Two_Pointers, Linked_List, Algorithm_I_Day_5_Two_Pointers 1 59.72 0018 4Sum Medium Array, Sorting, Two_Pointers 23 63.00 0017 Letter Combinations of a Phone Number Medium Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Backtracking, Algorithm_II_Day_11_Recursion_Backtracking 0 100.00 0016 3Sum Closest Medium Array, Sorting, Two_Pointers 3 99.98 0015 3Sum Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Two_Pointers, Data_Structure_II_Day_1_Array, Algorithm_II_Day_3_Two_Pointers 28 71.04 0014 Longest Common Prefix Easy Top_Interview_Questions, String 1 84.75 0013 Roman to Integer Easy Top_Interview_Questions, String, Hash_Table, Math 6 79.00 0012 Integer to Roman Medium String, Hash_Table, Math 7 75.71 0011 Container With Most Water Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Greedy, Two_Pointers, Algorithm_II_Day_4_Two_Pointers 2 99.81 0010 Regular Expression Matching Hard Top_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming, Recursion 3 80.22 0009 Palindrome Number Easy Math 13 58.99 0008 String to Integer (atoi) Medium Top_Interview_Questions, String 3 57.89 0007 Reverse Integer Medium Top_Interview_Questions, Math 2 66.74 0006 Zigzag Conversion Medium String 3 98.64 0005 Longest Palindromic Substring Medium Top_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming, Data_Structure_II_Day_9_String, Algorithm_II_Day_14_Dynamic_Programming, Dynamic_Programming_I_Day_17 10 98.57 0004 Median of Two Sorted Arrays Hard Top_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search, Divide_and_Conquer 3 81.72 0003 Longest Substring Without Repeating Characters Medium Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Sliding_Window, Algorithm_I_Day_6_Sliding_Window 5 91.03 0002 Add Two Numbers Medium Top_100_Liked_Questions, Top_Interview_Questions, Math, Linked_List, Recursion, Data_Structure_II_Day_10_Linked_List, Programming_Skills_II_Day_15 2 98.23 0001 Two Sum Easy Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Data_Structure_I_Day_2_Array, Level_1_Day_13_Hashmap 4 69.91