2151 Maximum Good People Based on Statements Java Hard Array, Bit_Manipulation, Backtracking, Enumeration 76 47.57 2100 Find Good Days to Rob the Bank Java Medium Array, Dynamic_Programming, Prefix_Sum 13 46.46 2099 Find Subsequence of Length K With the Largest Sum Java Easy Array, Hash_Table, Sorting, Heap_Priority_Queue 6 85.46 2097 Valid Arrangement of Pairs Java Hard Depth_First_Search, Graph, Eulerian_Circuit 158 100.00 2096 Step-By-Step Directions From a Binary Tree Node to Another Java Medium String, Depth_First_Search, Tree, Binary_Tree 30 76.29 2095 Delete the Middle Node of a Linked List Java Medium Two_Pointers, Linked_List 4 95.21 2094 Finding 3-Digit Even Numbers Java Easy Array, Hash_Table, Sorting, Enumeration 2 99.62 2092 Find All People With Secret Java Hard Depth_First_Search, Sorting, Breadth_First_Search, Graph, Union_Find 95 84.86 2091 Removing Minimum and Maximum From Array Java Medium Array, Greedy 2 100.00 2090 K Radius Subarray Averages Java Medium Array, Sliding_Window 12 83.19 2089 Find Target Indices After Sorting Array Java Easy Array, Sorting, Binary_Search 1 97.90 2088 Count Fertile Pyramids in a Land Java Hard Array, Dynamic_Programming, Matrix 12 83.56 2087 Minimum Cost Homecoming of a Robot in a Grid Java Medium Array, Greedy, Matrix 2 79.89 2086 Minimum Number of Buckets Required to Collect Rainwater from Houses Java Medium String, Dynamic_Programming, Greedy 8 73.71 2085 Count Common Words With One Occurrence Java Easy Array, String, Hash_Table, Counting 6 77.66 2080 Range Frequency Queries Java Medium Array, Hash_Table, Binary_Search, Design, Segment_Tree 140 97.86 2079 Watering Plants Java Medium Array 0 100 2073 Time Needed to Buy Tickets Java Easy Array, Simulation, Queue 0 100.00 2058 Find the Minimum and Maximum Number of Nodes Between Critical Points Java Medium Linked_List 4 100.00 2057 Smallest Index With Equal Value Java Easy Array 1 94.39 2055 Plates Between Candles Java Medium Array, String, Binary_Search, Prefix_Sum 10 92.49 2054 Two Best Non-Overlapping Events Java Medium Array, Dynamic_Programming, Sorting, Binary_Search, Heap_Priority_Queue 58 70.59 2053 Kth Distinct String in an Array Java Easy Array, String, Hash_Table, Counting 7 65.75 2050 Parallel Courses III Java Hard Dynamic_Programming, Graph, Topological_Sort 33 86.04 2049 Count Nodes With the Highest Score Java Medium Array, Depth_First_Search, Tree, Binary_Tree 40 93.75 2048 Next Greater Numerically Balanced Number Java Medium Math, Backtracking, Enumeration 2 95.19 2047 Number of Valid Words in a Sentence Java Easy String 19 42.57 2045 Second Minimum Time to Reach Destination Java Hard Breadth_First_Search, Graph, Shortest_Path 65 74.03 2044 Count Number of Maximum Bitwise-OR Subsets Java Medium Array, Bit_Manipulation, Backtracking 12 58.97 2043 Simple Bank System Java Medium Array, Hash_Table, Design, Simulation 128 72.30 2042 Check if Numbers Are Ascending in a Sentence Java Easy String 2 75.46 2040 Kth Smallest Product of Two Sorted Arrays Java Hard Array, Binary_Search 635 75.24 2038 Remove Colored Pieces if Both Neighbors are the Same Color Java Medium String, Math, Greedy, Game_Theory 22 47.78 2037 Minimum Number of Moves to Seat Everyone Java Easy Array, Sorting 5 22.01 2035 Partition Array Into Two Arrays to Minimize Sum Difference Java Hard Array, Dynamic_Programming, Binary_Search, Two_Pointers, Bit_Manipulation, Ordered_Set, Bitmask 1336 39.36 2034 Stock Price Fluctuation Java Medium Hash_Table, Design, Heap_Priority_Queue, Ordered_Set, Data_Stream 163 65.51 2033 Minimum Operations to Make a Uni-Value Grid Java Medium Array, Math, Sorting, Matrix 41 87.53 2032 Two Out of Three Java Easy Array, Hash_Table 9 45.56 2030 Smallest K-Length Subsequence With Occurrences of a Letter Java Hard String, Greedy, Stack, Monotonic_Stack 131 64.46 2029 Stone Game IX Java Medium Array, Math, Greedy, Counting, Game_Theory 31 10.87 2028 Find Missing Observations Java Medium Array, Math, Simulation 10 31.40 2027 Minimum Moves to Convert String Java Easy String, Greedy 0 100.00 2025 Maximum Number of Ways to Partition an Array Java Hard Array, Hash_Table, Prefix_Sum, Counting, Enumeration 172 100.00 2024 Maximize the Confusion of an Exam Java Medium String, Binary_Search, Prefix_Sum, Sliding_Window 21 44.78 2023 Number of Pairs of Strings With Concatenation Equal to Target Java Medium Array, String 36 36.00 2022 Convert 1D Array Into 2D Array Java Easy Array, Matrix, Simulation 8 40.41 2019 The Score of Students Solving Math Expression Java Hard Array, String, Dynamic_Programming, Math, Stack, Memoization 435 89.93 2018 Check if Word Can Be Placed In Crossword Java Medium Array, Matrix, Enumeration 11 52.76 2017 Grid Game Java Medium Array, Matrix, Prefix_Sum 10 41.46 2016 Maximum Difference Between Increasing Elements Java Easy Array 0 100.00 2014 Longest Subsequence Repeated k Times Java Hard String, Greedy, Backtracking, Counting, Enumeration 169 98.59 2013 Detect Squares Java Medium Array, Hash_Table, Design, Counting 67 88.46 2012 Sum of Beauty in the Array Java Medium Array 10 44.69 2011 Final Value of Variable After Performing Operations Java Easy Array, String, Simulation 1 94.40 2009 Minimum Number of Operations to Make Array Continuous Java Hard Array, Binary_Search 57 72.43 2008 Maximum Earnings From Taxi Java Medium Array, Dynamic_Programming, Sorting, Binary_Search 116 55.59 2007 Find Original Array From Doubled Array Java Medium Array, Hash_Table, Sorting, Greedy 41 96.48 2006 Count Number of Pairs With Absolute Difference K Java Easy Array, Hash_Table, Counting 8 58.60 2003 Smallest Missing Genetic Value in Each Subtree Java Hard Dynamic_Programming, Depth_First_Search, Tree, Union_Find 126 85.18 2002 Maximum Product of the Length of Two Palindromic Subsequences Java Medium String, Dynamic_Programming, Bit_Manipulation, Backtracking, Bitmask 69 89.94 2001 Number of Pairs of Interchangeable Rectangles Java Medium Array, Hash_Table, Math, Counting, Number_Theory 34 99.02 2000 Reverse Prefix of Word Java Easy String, Two_Pointers 0 100.00 1998 GCD Sort of an Array Java Hard Array, Math, Sorting, Union_Find 51 100.00 1997 First Day Where You Have Been in All the Rooms Java Medium Array, Dynamic_Programming 14 83.10 1996 The Number of Weak Characters in the Game Java Medium Array, Sorting, Greedy, Stack, Monotonic_Stack 121 81.46 1995 Count Special Quadruplets Java Easy Array, Enumeration 2 99.20 1994 The Number of Good Subsets Java Hard Array, Dynamic_Programming, Math, Bit_Manipulation, Bitmask 15 94.29 1993 Operations on Tree Java Medium Hash_Table, Breadth_First_Search, Tree, Design 394 23.03 1992 Find All Groups of Farmland Java Medium Array, Depth_First_Search, Breadth_First_Search, Matrix 7 89.08 1991 Find the Middle Index in Array Java Easy Array, Prefix_Sum 0 100.00 1987 Number of Unique Good Subsequences Java Hard String, Dynamic_Programming 19 53.78 1986 Minimum Number of Work Sessions to Finish the Tasks Java Medium Array, Dynamic_Programming, Bit_Manipulation, Backtracking, Bitmask 2 90.18 1985 Find the Kth Largest Integer in the Array Java Medium Array, String, Sorting, Heap_Priority_Queue, Divide_and_Conquer, Quickselect 34 77.42 1984 Minimum Difference Between Highest and Lowest of K Scores Java Easy Array, Sorting, Sliding_Window 10 7.97 1982 Find Array Given Subset Sums Java Hard Array, Divide_and_Conquer 70 64.91 1981 Minimize the Difference Between Target and Chosen Elements Java Medium Array, Dynamic_Programming, Matrix 480 90.78 1980 Find Unique Binary String Java Medium Array, String, Backtracking 7 31.88 1979 Find Greatest Common Divisor of Array Java Easy Array, Math, Number_Theory 5 10.46 1977 Number of Ways to Separate Numbers Java Hard String, Dynamic_Programming, Suffix_Array 150 94.52 1976 Number of Ways to Arrive at Destination Java Medium Dynamic_Programming, Graph, Topological_Sort, Shortest_Path 14 77.59 1975 Maximum Matrix Sum Java Medium Array, Greedy, Matrix 4 100.00 1974 Minimum Time to Type Word Using Special Typewriter Java Easy String, Greedy 1 74.90 1971 Find if Path Exists in Graph Java Easy Depth_First_Search, Breadth_First_Search, Graph 4 99.57 1970 Last Day Where You Can Still Cross Java 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 Java Medium Math, Greedy, Recursion 0 100.00 1968 Array With Elements Not Equal to Average of Neighbors Java Medium Array, Sorting, Greedy 6 92.86 1967 Number of Strings That Appear as Substrings in Word Java Easy String 3 10.82 1965 Employees With Missing Information Sql Easy Database, SQL_I_Day_4_Union_&_Select 617 30.40 1964 Find the Longest Valid Obstacle Course at Each Position Java Hard Array, Binary_Search, Binary_Indexed_Tree 79 85.00 1963 Minimum Number of Swaps to Make the String Balanced Java Medium String, Greedy, Two_Pointers, Stack 17 93.71 1962 Remove Stones to Minimize the Total Java Medium Array, Heap_Priority_Queue 761 48.67 1961 Check If String Is a Prefix of Array Java Easy Array, String 2 60.87 1960 Maximum Product of the Length of Two Palindromic Substrings Java Hard String, Hash_Function, Rolling_Hash 32 75.00 1959 Minimum Total Space Wasted With K Resizing Operations Java Medium Array, Dynamic_Programming 42 95.45 1958 Check if Move is Legal Java Medium Array, Matrix, Enumeration 0 100.00 1957 Delete Characters to Make Fancy String Java Easy String 54 52.94 1955 Count Number of Special Subsequences Java Hard Array, Dynamic_Programming 22 80.65 1954 Minimum Garden Perimeter to Collect Enough Apples Java Medium Math, Binary_Search 2 59.57 1953 Maximum Number of Weeks for Which You Can Work Java Medium Array, Greedy 4 40.93 1952 Three Divisors Java Easy Math 1 84.91 1948 Delete Duplicate Folders in System Java Hard Array, String, Hash_Table, Trie, Hash_Function 92 97.82 1947 Maximum Compatibility Score Sum Java Medium Array, Dynamic_Programming, Bit_Manipulation, Backtracking, Bitmask 2 95.90 1946 Largest Number After Mutating Substring Java Medium Array, String, Greedy 18 70.91 1945 Sum of Digits of String After Convert Java Easy String, Simulation 2 72.10 1944 Number of Visible People in a Queue Java Hard Array, Stack, Monotonic_Stack 9 99.65 1943 Describe the Painting Java Medium Array, Prefix_Sum 29 93.92 1942 The Number of the Smallest Unoccupied Chair Java Medium Array, Heap_Priority_Queue, Ordered_Set 73 49.69 1941 Check if All Characters Have Equal Number of Occurrences Java Easy String, Hash_Table, Counting 2 86.25 1938 Maximum Genetic Difference Query Java Hard Array, Bit_Manipulation, Trie 174 100.00 1937 Maximum Number of Points with Cost Java Medium Array, Dynamic_Programming 18 44.04 1936 Add Minimum Number of Rungs Java Medium Array, Greedy 1 100.00 1935 Maximum Number of Words You Can Type Java Easy String, Hash_Table 2 95.06 1932 Merge BSTs to Create Single BST Java Hard Hash_Table, Depth_First_Search, Tree, Binary_Search, Binary_Tree 87 48.43 1931 Painting a Grid With Three Different Colors Java Hard Dynamic_Programming 7 99.32 1930 Unique Length-3 Palindromic Subsequences Java Medium String, Hash_Table, Prefix_Sum 31 93.44 1929 Concatenation of Array Java Easy Array 1 92.52 1928 Minimum Cost to Reach Destination in Time Java Hard Dynamic_Programming, Graph 52 87.97 1927 Sum Game Java Medium Math, Greedy, Game_Theory 13 34.41 1926 Nearest Exit from Entrance in Maze Java Medium Array, Breadth_First_Search, Matrix, Graph_Theory_I_Day_6_Matrix_Related_Problems 12 40.55 1925 Count Square Sum Triples Java Easy Math, Enumeration 25 48.78 1923 Longest Common Subpath Java Hard Array, Binary_Search, Hash_Function, Rolling_Hash, Suffix_Array 517 73.88 1922 Count Good Numbers Java Medium Math, Recursion 1 87.11 1921 Eliminate Maximum Number of Monsters Java Medium Array, Sorting, Greedy 19 90.78 1920 Build Array from Permutation Java Easy Array, Simulation 1 94.23 1916 Count Ways to Build Rooms in an Ant Colony Java Hard Dynamic_Programming, Math, Tree, Graph, Topological_Sort, Combinatorics 1527 34.38 1915 Number of Wonderful Substrings Java Medium String, Hash_Table, Bit_Manipulation, Prefix_Sum 31 82.46 1914 Cyclically Rotating a Grid Java Medium Array, Matrix, Simulation 2 91.30 1913 Maximum Product Difference Between Two Pairs Java Easy Array, Sorting 7 70.01 1912 Design Movie Rental System Java Hard Array, Hash_Table, Design, Heap_Priority_Queue, Ordered_Set 562 74.14 1911 Maximum Alternating Subsequence Sum Java Medium Array, Dynamic_Programming 12 51.75 1910 Remove All Occurrences of a Substring Java Medium String 11 39.18 1909 Remove One Element to Make the Array Strictly Increasing Java Easy Array 0 100.00 1906 Minimum Absolute Difference Queries Java Medium Array, Hash_Table 176 71.61 1905 Count Sub Islands Java 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 Java Medium String, Math 0 100.00 1903 Largest Odd Number in String Java Easy String, Math, Greedy 6 23.18 1901 Find a Peak Element II Java 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 Java Hard Dynamic_Programming, Memoization 1 92.68 1899 Merge Triplets to Form Target Triplet Java Medium Array, Greedy 1 98.96 1898 Maximum Number of Removable Characters Java Medium Array, String, Binary_Search, Binary_Search_II_Day_6 121 72.51 1897 Redistribute Characters to Make All Strings Equal Java Easy String, Hash_Table, Counting 2 100.00 1896 Minimum Cost to Change the Final Value of Expression Java Hard String, Dynamic_Programming, Math, Stack 29 95.24 1895 Largest Magic Square Java Medium Array, Matrix, Prefix_Sum 7 80.72 1894 Find the Student that Will Replace the Chalk Java 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 Java Easy Array, Hash_Table, Prefix_Sum 1 72.81 1890 The Latest Login in 2020 Sql Easy Database, SQL_I_Day_8_Function 571 73.59 1889 Minimum Space Wasted From Packaging Java Hard Array, Sorting, Binary_Search, Prefix_Sum 98 45.92 1888 Minimum Number of Flips to Make the Binary String Alternating Java Medium String, Greedy 30 75.70 1887 Reduction Operations to Make the Array Elements Equal Java Medium Array, Sorting 26 94.56 1886 Determine Whether Matrix Can Be Obtained By Rotation Java Easy Array, Matrix, Programming_Skills_II_Day_7 1 78.38 1884 Egg Drop With 2 Eggs and N Floors Java Medium Dynamic_Programming, Math 0 100.00 1883 Minimum Skips to Arrive at Meeting On Time Java Hard Array, Dynamic_Programming 70 73.08 1882 Process Tasks Using Servers Java Medium Array, Heap_Priority_Queue 290 77.45 1881 Maximum Value after Insertion Java Medium String, Greedy 12 85.08 1880 Check if Word Equals Summation of Two Words Java Easy String 2 31.97 1879 Minimum XOR Sum of Two Arrays Java Hard Array, Dynamic_Programming, Bit_Manipulation, Bitmask 15 63.49 1878 Get Biggest Three Rhombus Sums in a Grid Java Medium Array, Math, Sorting, Matrix, Heap_Priority_Queue, Prefix_Sum 41 82.03 1877 Minimize Maximum Pair Sum in Array Java Medium Array, Sorting, Greedy, Two_Pointers 62 82.87 1876 Substrings of Size Three with Distinct Characters Java Easy String, Hash_Table, Counting, Sliding_Window 2 60.62 1873 Calculate Special Bonus Sql Easy Database, SQL_I_Day_2_Select_&_Order 543 71.60 1872 Stone Game VIII Java Hard Array, Dynamic_Programming, Math, Prefix_Sum, Game_Theory 3 98.18 1871 Jump Game VII Java Medium String, Two_Pointers, Prefix_Sum 14 76.25 1870 Minimum Speed to Arrive on Time Java Medium Array, Binary_Search, Binary_Search_II_Day_6 86 88.58 1869 Longer Contiguous Segments of Ones than Zeros Java Easy String 1 88.10 1866 Number of Ways to Rearrange Sticks With K Sticks Visible Java Hard Dynamic_Programming, Math, Combinatorics 67 96.33 1865 Finding Pairs With a Certain Sum Java Medium Array, Hash_Table, Design 195 83.97 1864 Minimum Number of Swaps to Make the Binary String Alternating Java Medium String, Greedy 3 43.20 1863 Sum of All Subset XOR Totals Java Easy Array, Math, Bit_Manipulation, Backtracking, Combinatorics 22 11.36 1862 Sum of Floored Pairs Java Hard Array, Math, Binary_Search, Prefix_Sum 115 70.91 1861 Rotating the Box Java Medium Array, Matrix, Two_Pointers 8 92.84 1860 Incremental Memory Leak Java Medium Simulation 5 78.57 1859 Sorting the Sentence Java Easy String, Sorting 2 50.32 1857 Largest Color Value in a Directed Graph Java Hard Hash_Table, Dynamic_Programming, Graph, Counting, Memoization, Topological_Sort 110 73.53 1856 Maximum Subarray Min-Product Java Medium Array, Stack, Prefix_Sum, Monotonic_Stack 28 92.10 1855 Maximum Distance Between a Pair of Values Java Medium Array, Greedy, Binary_Search, Two_Pointers, Binary_Search_I_Day_11 4 62.20 1854 Maximum Population Year Java Easy Array, Counting 0 100.00 1851 Minimum Interval to Include Each Query Java Hard Array, Sorting, Binary_Search, Heap_Priority_Queue, Line_Sweep 140 84.24 1850 Minimum Adjacent Swaps to Reach the Kth Smallest Number Java Medium String, Greedy, Two_Pointers 24 72.99 1849 Splitting a String Into Descending Consecutive Values Java Medium String, Backtracking 1 87.61 1848 Minimum Distance to the Target Element Java Easy Array 1 58.33 1847 Closest Room Java Hard Array, Sorting, Binary_Search 95 81.67 1846 Maximum Element After Decreasing and Rearranging Java Medium Array, Sorting, Greedy 4 93.59 1845 Seat Reservation Manager Java Medium Design, Heap_Priority_Queue, Programming_Skills_II_Day_17 47 87.63 1844 Replace All Digits with Characters Java Easy String 1 70.12 1840 Maximum Building Height Java Hard Array, Math 59 94.64 1839 Longest Substring Of All Vowels in Order Java Medium String, Sliding_Window 24 86.13 1838 Frequency of the Most Frequent Element Java 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 Java Easy Math 1 10.42 1835 Find XOR Sum of All Pairs Bitwise AND Java Hard Array, Math, Bit_Manipulation 1 100.00 1834 Single-Threaded CPU Java Medium Array, Sorting, Heap_Priority_Queue 134 83.22 1833 Maximum Ice Cream Bars Java Medium Array, Sorting, Greedy 39 84.49 1832 Check if the Sentence Is Pangram Java Easy String, Hash_Table 3 41.29 1830 Minimum Number of Operations to Make String Sorted Java Hard String, Math, Combinatorics 125 94.12 1829 Maximum XOR for Each Query Java Medium Array, Bit_Manipulation, Prefix_Sum 7 20.94 1828 Queries on Number of Points Inside a Circle Java Medium Array, Math, Geometry 23 75.03 1827 Minimum Operations to Make the Array Increasing Java Easy Array, Greedy 4 35.67 1825 Finding MK Average Java Hard Design, Heap_Priority_Queue, Ordered_Set, Queue 83 60.59 1824 Minimum Sideway Jumps Java Medium Array, Dynamic_Programming, Greedy 17 96.34 1823 Find the Winner of the Circular Game Java Medium Array, Math, Simulation, Recursion, Queue, Data_Structure_II_Day_14_Stack_Queue 3 64.85 1822 Sign of the Product of an Array Java Easy Array, Math, Programming_Skills_I_Day_4_Loop 1 58.05 1819 Number of Different Subsequences GCDs Java Hard Array, Math, Counting, Number_Theory 116 96.43 1818 Minimum Absolute Sum Difference Java Medium Array, Sorting, Binary_Search, Ordered_Set, Binary_Search_II_Day_7 13 99.44 1817 Finding the Users Active Minutes Java Medium Array, Hash_Table 16 91.64 1816 Truncate Sentence Java Easy Array, String 2 65.71 1815 Maximum Number of Groups Getting Fresh Donuts Java Hard Array, Dynamic_Programming, Bit_Manipulation, Bitmask, Memoization 7 86.67 1814 Count Nice Pairs in an Array Java Medium Array, Hash_Table, Math, Counting 47 83.12 1813 Sentence Similarity III Java Medium Array, String, Two_Pointers 3 41.38 1812 Determine Color of a Chessboard Square Java Easy String, Math 1 49.36 1808 Maximize Number of Nice Divisors Java Hard Math, Recursion 1 80.77 1807 Evaluate the Bracket Pairs of a String Java Medium Array, String, Hash_Table 40 80.47 1806 Minimum Number of Operations to Reinitialize a Permutation Java Medium Array, Math, Simulation 0 100.00 1805 Number of Different Integers in a String Java Easy String, Hash_Table 3 79.55 1803 Count Pairs With XOR in a Range Java Hard Array, Bit_Manipulation, Trie 77 100.00 1802 Maximum Value at a Given Index in a Bounded Array Java Medium Greedy, Binary_Search, Binary_Search_II_Day_17 2 58.44 1801 Number of Orders in the Backlog Java Medium Array, Heap_Priority_Queue, Simulation 39 78.46 1800 Maximum Ascending Subarray Sum Java Easy Array 0 100.00 1799 Maximize Score After N Operations Java Hard Array, Dynamic_Programming, Math, Bit_Manipulation, Backtracking, Bitmask, Number_Theory 164 78.22 1798 Maximum Number of Consecutive Values You Can Make Java Medium Array, Greedy 11 96.30 1797 Design Authentication Manager Java Medium Hash_Table, Design, Programming_Skills_II_Day_19 41 92.67 1796 Second Largest Digit in a String Java Easy String, Hash_Table 2 87.67 1795 Rearrange Products Table Sql Easy Database, SQL_I_Day_4_Union_&_Select 497 64.83 1793 Maximum Score of a Good Subarray Java Hard Array, Binary_Search, Two_Pointers, Stack, Monotonic_Stack 3 97.56 1792 Maximum Average Pass Ratio Java Medium Array, Greedy, Heap_Priority_Queue 456 89.78 1791 Find Center of Star Graph Java Easy Graph 0 100.00 1790 Check if One String Swap Can Make Strings Equal Java Easy String, Hash_Table, Counting, Programming_Skills_I_Day_4_Loop 0 100.00 1787 Make the XOR of All Segments Equal to Zero Java Hard Array, Dynamic_Programming, Bit_Manipulation 102 89.47 1786 Number of Restricted Paths From First to Last Node Java Medium Dynamic_Programming, Heap_Priority_Queue, Graph, Topological_Sort, Shortest_Path 86 88.56 1785 Minimum Elements to Add to Form a Given Sum Java Medium Array, Greedy 2 70.75 1784 Check if Binary String Has at Most One Segment of Ones Java Easy String 1 65.60 1782 Count Pairs Of Nodes Java Hard Binary_Search, Two_Pointers, Graph 128 86.96 1781 Sum of Beauty of All Substrings Java Medium String, Hash_Table, Counting 38 100.00 1780 Check if Number is a Sum of Powers of Three Java Medium Math 2 19.71 1779 Find Nearest Point That Has the Same X or Y Coordinate Java Easy Array, Programming_Skills_I_Day_3_Conditional_Statements 1 100.00 1776 Car Fleet II Java Hard Array, Math, Stack, Heap_Priority_Queue, Monotonic_Stack 19 93.81 1775 Equal Sum Arrays With Minimum Number of Operations Java Medium Array, Hash_Table, Greedy, Counting 16 70.88 1774 Closest Dessert Cost Java Medium Array, Dynamic_Programming, Backtracking 5 82.32 1773 Count Items Matching a Rule Java Easy Array, String 3 98.33 1771 Maximize Palindrome Length From Subsequences Java Hard String, Dynamic_Programming 58 87.88 1770 Maximum Score from Performing Multiplication Operations Java Medium Array, Dynamic_Programming 31 92.41 1769 Minimum Number of Operations to Move All Balls to Each Box Java Medium Array, String 3 91.66 1768 Merge Strings Alternately Java Easy String, Two_Pointers, Programming_Skills_I_Day_8_String 1 86.26 1766 Tree of Coprimes Java Hard Math, Depth_First_Search, Breadth_First_Search, Tree 111 94.07 1765 Map of Highest Peak Java Medium Array, Breadth_First_Search, Matrix 64 85.40 1764 Form Array by Concatenating Subarrays of Another Array Java Medium Array, Greedy, String_Matching 7 16.90 1763 Longest Nice Substring Java Easy String, Hash_Table, Bit_Manipulation, Sliding_Window 5 61.88 1761 Minimum Degree of a Connected Trio in a Graph Java Hard Graph 33 89.17 1760 Minimum Limit of Balls in a Bag Java Medium Array, Binary_Search, Binary_Search_II_Day_3 44 78.49 1759 Count Number of Homogenous Substrings Java Medium String, Math 19 42.40 1758 Minimum Changes To Make Alternating Binary String Java Easy String 2 98.92 1757 Recyclable and Low Fat Products Sql Easy Database, SQL_I_Day_1_Select 475 71.54 1755 Closest Subsequence Sum Java Hard Array, Dynamic_Programming, Two_Pointers, Bit_Manipulation, Bitmask 383 87.60 1754 Largest Merge Of Two Strings Java Medium String, Greedy, Two_Pointers 37 89.23 1753 Maximum Score From Removing Stones Java Medium Math, Greedy, Heap_Priority_Queue 0 100.00 1752 Check if Array Is Sorted and Rotated Java Easy Array 0 100.00 1751 Maximum Number of Events That Can Be Attended II Java Hard Array, Dynamic_Programming, Binary_Search 12 98.33 1750 Minimum Length of String After Deleting Similar Ends Java Medium String, Two_Pointers 5 68.68 1749 Maximum Absolute Sum of Any Subarray Java Medium Array, Dynamic_Programming 3 90.60 1748 Sum of Unique Elements Java Easy Array, Hash_Table, Counting 2 54.08 1745 Palindrome Partitioning IV Java Hard String, Dynamic_Programming 10 100.00 1744 Can You Eat Your Favorite Candy on Your Favorite Day? Java Medium Array, Prefix_Sum 5 100.00 1743 Restore the Array From Adjacent Pairs Java Medium Array, Hash_Table 95 99.08 1742 Maximum Number of Balls in a Box Java Easy Hash_Table, Math, Counting 7 98.87 1741 Find Total Time Spent by Each Employee Sql Easy Database, SQL_I_Day_8_Function 414 93.27 1739 Building Boxes Java Hard Math, Greedy, Binary_Search 1 84.38 1738 Find Kth Largest XOR Coordinate Value Java 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 Java Medium String, Hash_Table, Prefix_Sum, Counting 8 87.70 1736 Latest Time by Replacing Hidden Digits Java Easy String, Greedy 3 35.96 1735 Count Ways to Make Array With Product Java Hard Array, Dynamic_Programming, Math 189 43.75 1734 Decode XORed Permutation Java Medium Array, Bit_Manipulation 6 34.52 1733 Minimum Number of People to Teach Java Medium Array, Greedy 11 98.57 1732 Find the Highest Altitude Java Easy Array, Prefix_Sum 0 100.00 1729 Find Followers Count Sql Easy Database, SQL_I_Day_7_Function 456 88.39 1728 Cat and Mouse II Java Hard Dynamic_Programming, Math, Breadth_First_Search, Graph, Memoization, Game_Theory 12 99.12 1727 Largest Submatrix With Rearrangements Java Medium Array, Sorting, Greedy, Matrix 9 90.48 1726 Tuple with Same Product Java Medium Array, Hash_Table 235 90.73 1725 Number Of Rectangles That Can Form The Largest Square Java Easy Array 1 100.00 1723 Find Minimum Time to Finish All Jobs Java Hard Array, Dynamic_Programming, Bit_Manipulation, Backtracking, Bitmask 3 76.73 1722 Minimize Hamming Distance After Swap Operations Java Medium Array, Depth_First_Search, Union_Find 51 94.82 1721 Swapping Nodes in a Linked List Java Medium Two_Pointers, Linked_List 2 100.00 1720 Decode XORed Array Java Easy Array, Bit_Manipulation 1 100.00 1719 Number Of Ways To Reconstruct A Tree Java Hard Tree, Graph, Topological_Sort 91 67.57 1718 Construct the Lexicographically Largest Valid Sequence Java Medium Array, Backtracking 0 100.00 1717 Maximum Score From Removing Substrings Java Medium String, Greedy, Stack 19 99.25 1716 Calculate Money in Leetcode Bank Java Easy Math 1 65.33 1713 Minimum Operations to Make a Subsequence Java Hard Array, Hash_Table, Greedy, Binary_Search 81 95.39 1712 Ways to Split Array Into Three Subarrays Java Medium Array, Binary_Search, Two_Pointers, Prefix_Sum, Binary_Search_II_Day_10 16 84.24 1711 Count Good Meals Java Medium Array, Hash_Table 75 93.77 1710 Maximum Units on a Truck Java Easy Array, Sorting, Greedy 9 78.69 1707 Maximum XOR With an Element From Array Java Hard Array, Bit_Manipulation, Trie 150 97.24 1706 Where Will the Ball Fall Java Medium Array, Dynamic_Programming, Depth_First_Search, Matrix, Simulation 2 64.55 1705 Maximum Number of Eaten Apples Java Medium Array, Greedy, Heap_Priority_Queue 53 77.63 1704 Determine if String Halves Are Alike Java Easy String, Counting 1 100.00 1703 Minimum Adjacent Swaps for K Consecutive Ones Java Hard Array, Greedy, Prefix_Sum, Sliding_Window 10 96.25 1702 Maximum Binary String After Change Java Medium String, Greedy 42 82.86 1701 Average Waiting Time Java Medium Array, Simulation 2 100.00 1700 Number of Students Unable to Eat Lunch Java Easy Array, Stack, Simulation, Queue 2 63.14 1697 Checking Existence of Edge Length Limited Paths Java Hard Array, Sorting, Graph, Union_Find 94 90.48 1696 Jump Game VI Java Medium Array, Dynamic_Programming, Heap_Priority_Queue, Sliding_Window, Queue, Monotonic_Queue 23 86.05 1695 Maximum Erasure Value Java Medium Array, Hash_Table, Sliding_Window 5 99.82 1694 Reformat Phone Number Java Easy String 1 99.67 1693 Daily Leads and Partners Sql Easy Database, SQL_I_Day_7_Function 463 78.98 1691 Maximum Height by Stacking Cuboids Java Hard Array, Dynamic_Programming, Sorting 6 83.07 1690 Stone Game VII Java Medium Array, Dynamic_Programming, Math, Game_Theory 18 96.71 1689 Partitioning Into Minimum Number Of Deci-Binary Numbers Java Medium String, Greedy 5 93.98 1688 Count of Matches in Tournament Java Easy Math, Simulation 0 100.00 1687 Delivering Boxes from Storage to Ports Java Hard Array, Dynamic_Programming, Heap_Priority_Queue, Queue, Segment_Tree, Monotonic_Queue 9 91.09 1686 Stone Game VI Java Medium Array, Math, Sorting, Greedy, Heap_Priority_Queue, Game_Theory 139 62.50 1685 Sum of Absolute Differences in a Sorted Array Java Medium Array, Math, Prefix_Sum 4 80.17 1684 Count the Number of Consistent Strings Java Easy Array, String, Hash_Table, Bit_Manipulation 6 97.04 1681 Minimum Incompatibility Java Hard Array, Dynamic_Programming, Bit_Manipulation, Bitmask 1 100.00 1680 Concatenation of Consecutive Binary Numbers Java Medium Math, Bit_Manipulation, Simulation 70 95.05 1679 Max Number of K-Sum Pairs Java Medium Array, Hash_Table, Sorting, Two_Pointers 20 91.22 1678 Goal Parser Interpretation Java Easy String, Programming_Skills_I_Day_8_String 0 100.00 1675 Minimize Deviation in Array Java Hard Array, Greedy, Heap_Priority_Queue, Ordered_Set 104 88.83 1674 Minimum Moves to Make Array Complementary Java Medium Array, Hash_Table, Prefix_Sum 29 22.22 1673 Find the Most Competitive Subsequence Java Medium Array, Greedy, Stack, Monotonic_Stack 7 96.82 1672 Richest Customer Wealth Java Easy Array, Matrix, Programming_Skills_I_Day_6_Array 0 100.00 1671 Minimum Number of Removals to Make Mountain Array Java Hard Array, Dynamic_Programming, Greedy, Binary_Search 19 81.23 1670 Design Front Middle Back Queue Java Medium Array, Design, Linked_List, Queue, Data_Stream 5 100.00 1669 Merge In Between Linked Lists Java Medium Linked_List 2 76.51 1668 Maximum Repeating Substring Java Easy String, String_Matching 1 93.15 1667 Fix Names in a Table Sql Easy Database, SQL_I_Day_3_String_Processing_Functions 559 80.29 1665 Minimum Initial Energy to Finish Tasks Java Hard Array, Sorting, Greedy 30 81.16 1664 Ways to Make a Fair Array Java Medium Array, Dynamic_Programming 11 71.76 1663 Smallest String With A Given Numeric Value Java Medium String, Greedy 22 75.05 1662 Check If Two String Arrays are Equivalent Java Easy Array, String 0 100.00 1659 Maximize Grid Happiness Java Hard Dynamic_Programming, Bit_Manipulation, Bitmask, Memoization 95 75.00 1658 Minimum Operations to Reduce X to Zero Java Medium Array, Hash_Table, Binary_Search, Prefix_Sum, Sliding_Window 4 98.95 1657 Determine if Two Strings Are Close Java Medium String, Hash_Table, Sorting 12 97.58 1656 Design an Ordered Stream Java Easy Array, Hash_Table, Design, Data_Stream 95 74.07 1655 Distribute Repeating Integers Java Hard Array, Dynamic_Programming, Bit_Manipulation, Backtracking, Bitmask 7 94.23 1654 Minimum Jumps to Reach Home Java 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 Java Medium String, Dynamic_Programming, Stack 26 90.44 1652 Defuse the Bomb Java Easy Array 0 100.00 1649 Create Sorted Array through Instructions Java 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 Java 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 Java Medium String, Sorting, Greedy 8 100.00 1646 Get Maximum in Generated Array Java Easy Array, Dynamic_Programming, Simulation 0 100.00 1643 Kth Smallest Instructions Java Hard Array, Dynamic_Programming, Math, Combinatorics 1 100.00 1642 Furthest Building You Can Reach Java Medium Array, Greedy, Heap_Priority_Queue 13 98.96 1641 Count Sorted Vowel Strings Java Medium Dynamic_Programming 0 100.00 1640 Check Array Formation Through Concatenation Java Easy Array, Hash_Table 1 87.62 1639 Number of Ways to Form a Target String Given a Dictionary Java Hard Array, String, Dynamic_Programming 50 95.33 1638 Count Substrings That Differ by One Character Java Medium String, Hash_Table, Dynamic_Programming 5 76.39 1637 Widest Vertical Area Between Two Points Containing No Points Java Medium Array, Sorting 17 74.19 1636 Sort Array by Increasing Frequency Java Easy Array, Hash_Table, Sorting 7 75.30 1632 Rank Transform of a Matrix Java Hard Array, Greedy, Matrix, Graph, Union_Find, Topological_Sort 65 100.00 1631 Path With Minimum Effort Java Medium Array, Depth_First_Search, Breadth_First_Search, Binary_Search, Matrix, Heap_Priority_Queue, Union_Find 75 60.52 1630 Arithmetic Subarrays Java Medium Array, Sorting, Programming_Skills_II_Day_9 8 93.62 1629 Slowest Key Java Easy Array, String 4 14.60 1627 Graph Connectivity With Threshold Java Hard Array, Math, Union_Find 7 98.45 1626 Best Team With No Conflicts Java Medium Array, Dynamic_Programming, Sorting 38 92.31 1625 Lexicographically Smallest String After Applying Operations Java Medium String, Breadth_First_Search 91 91.80 1624 Largest Substring Between Two Equal Characters Java Easy String, Hash_Table 1 85.13 1622 Fancy Sequence Java Hard Math, Design, Segment_Tree 40 96.55 1621 Number of Sets of K Non-Overlapping Line Segments Java Medium Dynamic_Programming, Math 16 94.74 1620 Coordinate With Maximum Network Quality Java Medium Array, Enumeration 111 7.14 1619 Mean of Array After Removing Some Elements Java Easy Array, Sorting 2 99.81 1617 Count Subtrees With Max Distance Between Cities Java Hard Dynamic_Programming, Tree, Bit_Manipulation, Bitmask, Enumeration 52 78.95 1616 Split Two Strings to Make Palindrome Java Medium String, Greedy, Two_Pointers 4 89.77 1615 Maximal Network Rank Java Medium Graph, Graph_Theory_I_Day_14_Graph_Theory 3 97.34 1614 Maximum Nesting Depth of the Parentheses Java Easy String, Stack 1 80.44 1611 Minimum One Bit Operations to Make Integers Zero Java Hard Dynamic_Programming, Bit_Manipulation, Memoization 1 88.24 1610 Maximum Number of Visible Points Java Hard Array, Math, Sorting, Sliding_Window, Geometry 122 97.44 1609 Even Odd Tree Java Medium Breadth_First_Search, Tree, Binary_Tree 8 98.81 1608 Special Array With X Elements Greater Than or Equal X Java Easy Array, Sorting, Binary_Search, Binary_Search_I_Day_7 2 61.14 1606 Find Servers That Handled Most Number of Requests Java Hard Array, Greedy, Heap_Priority_Queue, Ordered_Set 118 98.21 1605 Find Valid Matrix Given Row and Column Sums Java Medium Array, Greedy, Matrix 2 98.45 1604 Alert Using Same Key-Card Three or More Times in a One Hour Period Java Medium Array, String, Hash_Table, Sorting 77 95.79 1603 Design Parking System Java Easy Design, Simulation, Counting, Programming_Skills_I_Day_12_Class_&_Object 8 76.16 1601 Maximum Number of Achievable Transfer Requests Java Hard Array, Bit_Manipulation, Backtracking, Enumeration 26 84.02 1600 Throne Inheritance Java Medium Hash_Table, Depth_First_Search, Tree, Design 267 90.38 1599 Maximum Profit of Operating a Centennial Wheel Java Medium Array, Simulation 4 95.65 1598 Crawler Log Folder Java Easy Array, String, Stack 0 100.00 1595 Minimum Cost to Connect Two Groups of Points Java Hard Array, Dynamic_Programming, Matrix, Bit_Manipulation, Bitmask 74 64.83 1594 Maximum Non Negative Product in a Matrix Java Medium Array, Dynamic_Programming, Matrix 1 100.00 1593 Split a String Into the Max Number of Unique Substrings Java Medium String, Hash_Table, Backtracking 8 95.81 1592 Rearrange Spaces Between Words Java Easy String 3 67.74 1591 Strange Printer II Java Hard Array, Matrix, Graph, Topological_Sort 12 90.00 1590 Make Sum Divisible by P Java Medium Array, Hash_Table, Prefix_Sum 56 62.20 1589 Maximum Sum Obtained of Any Permutation Java Medium Array, Sorting, Greedy, Prefix_Sum 25 92.45 1588 Sum of All Odd Length Subarrays Java Easy Array, Math, Prefix_Sum, Programming_Skills_I_Day_6_Array 0 100.00 1587 Bank Account Summary II Sql Easy Database, SQL_I_Day_10_Where 630 60.32 1585 Check If String Is Transformable With Substring Sort Operations Java Hard String, Sorting, Greedy 20 97.22 1584 Min Cost to Connect All Points Java Medium Array, Union_Find, Minimum_Spanning_Tree 134 87.37 1583 Count Unhappy Friends Java Medium Array, Simulation 3 93.13 1582 Special Positions in a Binary Matrix Java Easy Array, Matrix 2 82.12 1581 Customer Who Visited but Did Not Make Any Transactions Sql Easy Database, SQL_I_Day_5_Union 1039 76.99 1579 Remove Max Number of Edges to Keep Graph Fully Traversable Java Hard Graph, Union_Find 30 66.23 1578 Minimum Time to Make Rope Colorful Java Medium Array, String, Dynamic_Programming, Greedy 4 100.00 1577 Number of Ways Where Square of Number Is Equal to Product of Two Numbers Java Medium Array, Hash_Table, Math, Two_Pointers 20 86.27 1576 Replace All ?'s to Avoid Consecutive Repeating Characters Java Easy String 2 82.74 1575 Count All Possible Routes Java Hard Array, Dynamic_Programming, Memoization 111 72.26 1574 Shortest Subarray to be Removed to Make Array Sorted Java 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 Java Medium String, Math 9 82.09 1572 Matrix Diagonal Sum Java Easy Array, Matrix, Programming_Skills_I_Day_7_Array 3 10.25 1569 Number of Ways to Reorder Array to Get Same BST Java 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 Java Hard Array, Depth_First_Search, Breadth_First_Search, Matrix, Strongly_Connected_Component 1 100.00 1567 Maximum Length of Subarray With Positive Product Java Medium Array, Dynamic_Programming, Greedy, Dynamic_Programming_I_Day_6 4 80.86 1566 Detect Pattern of Length M Repeated K or More Times Java Easy Array, Enumeration 1 49.25 1563 Stone Game V Java Hard Array, Dynamic_Programming, Math, Game_Theory 36 95.56 1562 Find Latest Group of Size M Java Medium Array, Binary_Search, Simulation, Binary_Search_II_Day_19 8 90.00 1561 Maximum Number of Coins You Can Get Java Medium Array, Math, Sorting, Greedy, Game_Theory 34 69.29 1560 Most Visited Sector in a Circular Track Java Easy Array, Simulation 1 88.89 1559 Detect Cycles in 2D Grid Java Medium Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find 22 82.51 1558 Minimum Numbers of Function Calls to Make Target Array Java Medium Array, Greedy 42 69.17 1557 Minimum Number of Vertices to Reach All Nodes Java Medium Graph, Data_Structure_II_Day_19_Graph, Graph_Theory_I_Day_13_Graph_Theory 8 99.94 1556 Thousand Separator Java Easy String 1 57.92 1553 Minimum Number of Days to Eat N Oranges Java Hard Dynamic_Programming, Memoization 5 91.90 1552 Magnetic Force Between Two Balls Java Medium Array, Sorting, Binary_Search, Binary_Search_II_Day_4 39 99.65 1551 Minimum Operations to Make Array Equal Java Medium Math 7 12.93 1550 Three Consecutive Odds Java Easy Array 0 100.00 1547 Minimum Cost to Cut a Stick Java Hard Array, Dynamic_Programming 6 100.00 1546 Maximum Number of Non-Overlapping Subarrays With Sum Equals Target Java Medium Array, Hash_Table, Greedy, Prefix_Sum 56 71.58 1545 Find Kth Bit in Nth Binary String Java Medium String, Recursion 0 100.00 1544 Make The String Great Java Easy String, Stack 6 50.00 1542 Find Longest Awesome Substring Java Hard String, Hash_Table, Bit_Manipulation 12 84.16 1541 Minimum Insertions to Balance a Parentheses String Java Medium String, Greedy, Stack 12 85.50 1540 Can Convert String in K Moves Java Medium String, Hash_Table 10 100.00 1539 Kth Missing Positive Number Java Easy Array, Binary_Search, Binary_Search_I_Day_6 0 100.00 1537 Get the Maximum Score Java Hard Array, Dynamic_Programming, Greedy, Two_Pointers 6 58.14 1536 Minimum Swaps to Arrange a Binary Grid Java Medium Array, Greedy, Matrix 1 100.00 1535 Find the Winner of an Array Game Java Medium Array, Simulation 1 86.99 1534 Count Good Triplets Java Easy Array, Enumeration 14 82.96 1531 String Compression II Java Hard String, Dynamic_Programming 34 83.91 1530 Number of Good Leaf Nodes Pairs Java Medium Depth_First_Search, Tree, Binary_Tree 3 94.18 1529 Minimum Suffix Flips Java Medium String, Greedy 6 89.67 1528 Shuffle String Java Easy Array, String 2 54.77 1527 Patients With a Condition Sql Easy Database, SQL_I_Day_3_String_Processing_Functions 308 66.93 1526 Minimum Number of Increments on Subarrays to Form a Target Array Java Hard Array, Dynamic_Programming, Greedy, Stack, Monotonic_Stack 4 70.36 1525 Number of Good Ways to Split a String Java Medium String, Dynamic_Programming, Bit_Manipulation 19 69.66 1524 Number of Sub-arrays With Odd Sum Java Medium Array, Dynamic_Programming, Math, Prefix_Sum 9 90.24 1523 Count Odd Numbers in an Interval Range Java Easy Math, Programming_Skills_I_Day_1_Basic_Data_Type 0 100.00 1521 Find a Value of a Mysterious Function Closest to Target Java Hard Array, Binary_Search, Bit_Manipulation, Segment_Tree 9 100.00 1520 Maximum Number of Non-Overlapping Substrings Java Hard String, Greedy 15 92.93 1519 Number of Nodes in the Sub-Tree With the Same Label Java Medium Hash_Table, Depth_First_Search, Breadth_First_Search, Tree, Counting 60 98.13 1518 Water Bottles Java Easy Math, Simulation 0 100.00 1515 Best Position for a Service Centre Java Hard Math, Geometry, Randomized 6 87.14 1514 Path with Maximum Probability Java Medium Heap_Priority_Queue, Graph, Shortest_Path 31 93.10 1513 Number of Substrings With Only 1s Java Medium String, Math 3 97.83 1512 Number of Good Pairs Java Easy Array, Hash_Table, Math, Counting 1 84.97 1510 Stone Game IV Java Hard Dynamic_Programming, Math, Game_Theory 12 85.75 1509 Minimum Difference Between Largest and Smallest Value in Three Moves Java Medium Array, Sorting, Greedy 19 76.94 1508 Range Sum of Sorted Subarray Sums Java Medium Array, Sorting, Binary_Search, Two_Pointers, Binary_Search_II_Day_14 60 93.84 1507 Reformat Date Java Easy String 1 98.73 1505 Minimum Possible Integer After at Most K Adjacent Swaps On Digits Java Hard String, Greedy, Segment_Tree, Binary_Indexed_Tree 12 96.77 1504 Count Submatrices With All Ones Java Medium Array, Dynamic_Programming, Matrix, Stack, Monotonic_Stack 9 85.86 1503 Last Moment Before All Ants Fall Out of a Plank Java Medium Array, Simulation, Brainteaser 1 81.72 1502 Can Make Arithmetic Progression From Sequence Java Easy Array, Sorting, Programming_Skills_I_Day_4_Loop 4 14.13 1499 Max Value of Equation Java Hard Array, Heap_Priority_Queue, Sliding_Window, Queue, Monotonic_Queue 7 98.61 1498 Number of Subsequences That Satisfy the Given Sum Condition Java Medium Array, Sorting, Binary_Search, Two_Pointers, Binary_Search_II_Day_15 27 99.13 1497 Check If Array Pairs Are Divisible by k Java Medium Array, Hash_Table, Counting 7 97.44 1496 Path Crossing Java Easy String, Hash_Table 1 97.41 1494 Parallel Courses II Java Hard Dynamic_Programming, Bit_Manipulation, Graph, Bitmask 325 42.24 1493 Longest Subarray of 1's After Deleting One Element Java Medium Dynamic_Programming, Math, Sliding_Window 2 87.25 1492 The kth Factor of n Java Medium Math 1 83.94 1491 Average Salary Excluding the Minimum and Maximum Salary Java 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 Java Hard Sorting, Graph, Union_Find, Minimum_Spanning_Tree, Strongly_Connected_Component 17 100.00 1488 Avoid Flood in The City Java Medium Array, Hash_Table, Greedy, Binary_Search, Heap_Priority_Queue, Binary_Search_II_Day_18 82 75.08 1487 Making File Names Unique Java Medium Array, String, Hash_Table 36 98.46 1486 XOR Operation in an Array Java Easy Math, Bit_Manipulation 0 100.00 1484 Group Sold Products By The Date Sql Easy Database, SQL_I_Day_3_String_Processing_Functions 395 77.20 1483 Kth Ancestor of a Tree Node Java 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 Java Medium Array, Binary_Search, Binary_Search_II_Day_7 25 69.18 1481 Least Number of Unique Integers after K Removals Java Medium Array, Hash_Table, Sorting, Greedy, Counting 62 85.33 1480 Running Sum of 1d Array Java Easy Array, Prefix_Sum 0 100.00 1478 Allocate Mailboxes Java Hard Array, Dynamic_Programming, Math, Sorting 12 78.87 1477 Find Two Non-overlapping Sub-arrays Each With Target Sum Java Medium Array, Hash_Table, Dynamic_Programming, Binary_Search, Sliding_Window 8 89.43 1476 Subrectangle Queries Java Medium Array, Matrix, Design 20 97.61 1475 Final Prices With a Special Discount in a Shop Java Easy Array, Stack, Monotonic_Stack 2 80.33 1473 Paint House III Java Hard Array, Dynamic_Programming 26 89.13 1472 Design Browser History Java Medium Array, Stack, Design, Linked_List, Data_Stream, Doubly_Linked_List 76 82.33 1471 The k Strongest Values in an Array Java Medium Array, Sorting, Two_Pointers 37 88.20 1470 Shuffle the Array Java Easy Array 1 51.62 1467 Probability of a Two Boxes Having The Same Number of Distinct Balls Java Hard Dynamic_Programming, Math, Backtracking, Combinatorics, Probability_and_Statistics 1 100.00 1466 Reorder Routes to Make All Paths Lead to the City Zero Java 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 Java Medium Array, Sorting, Greedy 21 35.40 1464 Maximum Product of Two Elements in an Array Java Easy Array, Sorting, Heap_Priority_Queue 1 90.39 1463 Cherry Pickup II Java Hard Array, Dynamic_Programming, Matrix 10 99.58 1462 Course Schedule IV Java 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 Java Medium String, Hash_Table, Bit_Manipulation, Hash_Function, Rolling_Hash 169 52.07 1460 Make Two Arrays Equal by Reversing Sub-arrays Java Easy Array, Hash_Table, Sorting 13 14.65 1458 Max Dot Product of Two Subsequences Java Hard Array, Dynamic_Programming 6 98.36 1457 Pseudo-Palindromic Paths in a Binary Tree Java 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 Java Medium String, Sliding_Window 19 53.73 1455 Check If a Word Occurs As a Prefix of Any Word in a Sentence Java Easy String, String_Matching 1 32.08 1453 Maximum Number of Darts Inside of a Circular Dartboard Java Hard Array, Math, Geometry 22 100.00 1452 People Whose List of Favorite Companies Is Not a Subset of Another List Java Medium Array, String, Hash_Table 117 78.71 1451 Rearrange Words in a Sentence Java Medium String, Sorting 21 89.94 1450 Number of Students Doing Homework at a Given Time Java Easy Array 0 100.00 1449 Form Largest Integer With Digits That Add up to Target Java Hard Array, Dynamic_Programming 8 77.46 1448 Count Good Nodes in Binary Tree Java Medium Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree 2 99.63 1447 Simplified Fractions Java Medium String, Math, Number_Theory 33 69.60 1446 Consecutive Characters Java Easy String 3 30.50 1444 Number of Ways of Cutting a Pizza Java Hard Array, Dynamic_Programming, Matrix, Memoization 14 46.03 1443 Minimum Time to Collect All Apples in a Tree Java Medium Hash_Table, Depth_First_Search, Breadth_First_Search, Tree 75 57.75 1442 Count Triplets That Can Form Two Arrays of Equal XOR Java Medium Array, Hash_Table, Math, Bit_Manipulation, Prefix_Sum 2 79.80 1441 Build an Array With Stack Operations Java Easy Array, Stack, Simulation 1 38.47 1439 Find the Kth Smallest Sum of a Matrix With Sorted Rows Java Hard Array, Binary_Search, Matrix, Heap_Priority_Queue 40 75.79 1438 Longest Continuous Subarray With Absolute Diff Less Than or Equal to Limit Java 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 Java Easy Array 2 73.75 1436 Destination City Java Easy String, Hash_Table 7 11.79 1434 Number of Ways to Wear Different Hats to Each Other Java Hard Array, Dynamic_Programming, Bit_Manipulation, Bitmask 31 77.92 1433 Check If a String Can Break Another String Java Medium String, Sorting, Greedy 9 77.89 1432 Max Difference You Can Get From Changing an Integer Java Medium Math, Greedy 1 97.22 1431 Kids With the Greatest Number of Candies Java Easy Array 1 84.43 1425 Constrained Subsequence Sum Java Hard Array, Dynamic_Programming, Heap_Priority_Queue, Sliding_Window, Queue, Monotonic_Queue 69 30.52 1424 Diagonal Traverse II Java Medium Array, Sorting, Heap_Priority_Queue 39 85.56 1423 Maximum Points You Can Obtain from Cards Java Medium Array, Prefix_Sum, Sliding_Window 4 31.70 1422 Maximum Score After Splitting a String Java Easy String 1 96.45 1420 Build Array Where You Can Find The Maximum Exactly K Comparisons Java Hard Dynamic_Programming 22 86.32 1419 Minimum Number of Frogs Croaking Java Medium String, Counting 19 32.16 1418 Display Table of Food Orders in a Restaurant Java Medium Array, String, Hash_Table, Sorting, Ordered_Set 42 77.01 1417 Reformat The String Java Easy String 4 88.39 1416 Restore The Array Java Hard String, Dynamic_Programming 34 100.00 1415 The k-th Lexicographical String of All Happy Strings of Length n Java Medium String, Backtracking 2 90.55 1414 Find the Minimum Number of Fibonacci Numbers Whose Sum Is K Java Medium Greedy 2 67.22 1413 Minimum Value to Get Positive Step by Step Sum Java Easy Array, Prefix_Sum 0 100.00 1411 Number of Ways to Paint N × 3 Grid Java Hard Dynamic_Programming 14 34.91 1410 HTML Entity Parser Java Medium String, Hash_Table 19 98.92 1409 Queries on a Permutation With Key Java Medium Array, Simulation, Binary_Indexed_Tree 15 38.43 1408 String Matching in an Array Java Easy String, String_Matching 8 24.88 1407 Top Travellers Sql Easy Database, SQL_I_Day_9_Control_of_Flow 682 70.16 1406 Stone Game III Java Hard Array, Dynamic_Programming, Math, Game_Theory 14 82.02 1405 Longest Happy String Java Medium String, Greedy, Heap_Priority_Queue 0 100.00 1404 Number of Steps to Reduce a Number in Binary Representation to One Java Medium String, Bit_Manipulation 1 62.90 1403 Minimum Subsequence in Non-Increasing Order Java Easy Array, Sorting, Greedy 4 79.60 1402 Reducing Dishes Java Hard Array, Dynamic_Programming, Sorting, Greedy 3 66.20 1401 Circle and Rectangle Overlapping Java Medium Math, Geometry 2 6.67 1400 Construct K Palindrome Strings Java Medium String, Hash_Table, Greedy, Counting 5 94.62 1399 Count Largest Group Java Easy Hash_Table, Math 3 98.21 1397 Find All Good Strings Java Hard String, Dynamic_Programming, String_Matching 85 41.25 1396 Design Underground System Java Medium String, Hash_Table, Design 89 89.64 1395 Count Number of Teams Java Medium Array, Dynamic_Programming, Binary_Indexed_Tree 18 91.75 1394 Find Lucky Integer in an Array Java Easy Array, Hash_Table, Counting 2 82.56 1393 Capital Gain/Loss Sql Medium Database, SQL_I_Day_9_Control_of_Flow 457 79.39 1392 Longest Happy Prefix Java Hard String, Hash_Function, String_Matching, Rolling_Hash 39 28.37 1391 Check if There is a Valid Path in a Grid Java Medium Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find 14 85.37 1390 Four Divisors Java Medium Array, Math 13 97.25 1389 Create Target Array in the Given Order Java Easy Array, Simulation 0 100.00 1388 Pizza With 3n Slices Java Hard Array, Dynamic_Programming, Greedy, Heap_Priority_Queue 5 93.33 1387 Sort Integers by The Power Value Java Medium Dynamic_Programming, Sorting, Memoization 52 87.20 1386 Cinema Seat Allocation Java Medium Array, Hash_Table, Greedy, Bit_Manipulation 32 69.41 1385 Find the Distance Value Between Two Arrays Java Easy Array, Sorting, Binary_Search, Two_Pointers, Binary_Search_I_Day_3 5 65.78 1383 Maximum Performance of a Team Java Hard Array, Sorting, Greedy, Heap_Priority_Queue 66 66.03 1382 Balance a Binary Search Tree Java Medium Depth_First_Search, Greedy, Tree, Binary_Tree, Binary_Search_Tree, Divide_and_Conquer 5 65.24 1381 Design a Stack With Increment Operation Java Medium Array, Stack, Design 8 62.23 1380 Lucky Numbers in a Matrix Java Easy Array, Matrix 2 82.40 1379 Find a Corresponding Node of a Binary Tree in a Clone of That Tree Java Medium Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree 2 77.89 1377 Frog Position After T Seconds Java Hard Depth_First_Search, Breadth_First_Search, Tree, Graph 6 81.30 1376 Time Needed to Inform All Employees Java 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 Java Medium Array 2 89.02 1374 Generate a String With Characters That Have Odd Counts Java Easy String 1 90.52 1373 Maximum Sum BST in Binary Tree Java Hard Dynamic_Programming, Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree 15 47.56 1372 Longest ZigZag Path in a Binary Tree Java Medium Dynamic_Programming, Depth_First_Search, Tree, Binary_Tree 9 64.47 1371 Find the Longest Substring Containing Vowels in Even Counts Java Medium String, Hash_Table, Bit_Manipulation, Prefix_Sum 25 80.38 1370 Increasing Decreasing String Java Easy String, Hash_Table, Counting 4 80.41 1368 Minimum Cost to Make at Least One Valid Path in a Grid Java Hard Array, Breadth_First_Search, Matrix, Heap_Priority_Queue, Graph, Shortest_Path 8 99.38 1367 Linked List in Binary Tree Java 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 Java Medium Array, String, Hash_Table, Sorting, Counting 5 95.68 1365 How Many Numbers Are Smaller Than the Current Number Java Easy Array, Hash_Table, Sorting, Counting 26 6.46 1363 Largest Multiple of Three Java Hard Array, Dynamic_Programming, Greedy 5 84.67 1362 Closest Divisors Java Medium Math 8 84.91 1361 Validate Binary Tree Nodes Java Medium Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Graph, Union_Find 8 69.78 1360 Number of Days Between Two Dates Java Easy String, Math 2 78.82 1359 Count All Valid Pickup and Delivery Options Java Hard Dynamic_Programming, Math, Combinatorics 0 100.00 1358 Number of Substrings Containing All Three Characters Java Medium String, Hash_Table, Sliding_Window 15 53.82 1357 Apply Discount Every n Orders Java Medium Array, Hash_Table, Design 174 58.82 1356 Sort Integers by The Number of 1 Bits Java Easy Array, Sorting, Bit_Manipulation, Counting, Programming_Skills_I_Day_11_Containers_&_Libraries 10 65.50 1354 Construct Target Array With Multiple Sums Java Hard Array, Heap_Priority_Queue 2 100.00 1353 Maximum Number of Events That Can Be Attended Java Medium Array, Greedy, Heap_Priority_Queue 70 21.66 1352 Product of the Last K Numbers Java Medium Array, Math, Design, Queue, Data_Stream 24 60.43 1351 Count Negative Numbers in a Sorted Matrix Java Easy Array, Binary_Search, Matrix, Binary_Search_I_Day_8 1 49.66 1349 Maximum Students Taking Exam Java Hard Array, Dynamic_Programming, Matrix, Bit_Manipulation, Bitmask 4 76.98 1348 Tweet Counts Per Frequency Java Medium Hash_Table, Sorting, Binary_Search, Design, Ordered_Set 86 99.44 1347 Minimum Number of Steps to Make Two Strings Anagram Java Medium String, Hash_Table, Counting 13 76.34 1346 Check If N and Its Double Exist Java Easy Array, Hash_Table, Sorting, Binary_Search, Two_Pointers, Binary_Search_I_Day_9 1 99.64 1345 Jump Game IV Java Hard Array, Hash_Table, Breadth_First_Search 65 89.91 1344 Angle Between Hands of a Clock Java Medium Math 0 100.00 1343 Number of Sub-arrays of Size K and Average Greater than or Equal to Threshold Java Medium Array, Sliding_Window 5 46.57 1342 Number of Steps to Reduce a Number to Zero Java Easy Math, Bit_Manipulation 1 58.49 1340 Jump Game V Java Hard Array, Dynamic_Programming, Sorting 13 71.33 1339 Maximum Product of Splitted Binary Tree Java Medium Depth_First_Search, Tree, Binary_Tree 11 83.43 1338 Reduce Array Size to The Half Java Medium Array, Hash_Table, Sorting, Greedy, Heap_Priority_Queue 61 73.82 1337 The K Weakest Rows in a Matrix Java Easy Array, Sorting, Binary_Search, Matrix, Heap_Priority_Queue, Binary_Search_I_Day_9 1 99.77 1335 Minimum Difficulty of a Job Schedule Java Hard Array, Dynamic_Programming 11 79.28 1334 Find the City With the Smallest Number of Neighbors at a Threshold Distance Java Medium Dynamic_Programming, Graph, Shortest_Path 21 49.75 1333 Filter Restaurants by Vegan-Friendly, Price and Distance Java Medium Array, Sorting 10 55.43 1332 Remove Palindromic Subsequences Java Easy String, Two_Pointers 0 100.00 1331 Rank Transform of an Array Java Easy Array, Hash_Table, Sorting 22 98.50 1330 Reverse Subarray To Maximize Array Value Java Hard Array, Math, Greedy 9 88.00 1329 Sort the Matrix Diagonally Java Medium Array, Sorting, Matrix 15 26.03 1328 Break a Palindrome Java Medium String, Greedy 0 100.00 1326 Minimum Number of Taps to Open to Water a Garden Java Hard Array, Dynamic_Programming, Greedy 3 90.04 1325 Delete Leaves With a Given Value Java Medium Depth_First_Search, Tree, Binary_Tree 2 33.61 1324 Print Words Vertically Java Medium Array, String, Simulation 1 90.59 1323 Maximum 69 Number Java Easy Math, Greedy 3 32.03 1320 Minimum Distance to Type a Word Using Two Fingers Java Hard String, Dynamic_Programming 16 82.29 1319 Number of Operations to Make Network Connected Java 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 Java Medium Bit_Manipulation 0 100.00 1317 Convert Integer to the Sum of Two No-Zero Integers Java Easy Math 1 84.36 1316 Distinct Echo Substrings Java Hard String, Dynamic_Programming, Sliding_Window, Trie, Hash_Function, Rolling_Hash 165 93.15 1315 Sum of Nodes with Even-Valued Grandparent Java Medium Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree 2 78.61 1314 Matrix Block Sum Java Medium Array, Matrix, Prefix_Sum, Dynamic_Programming_I_Day_14 5 67.46 1313 Decompress Run-Length Encoded List Java Easy Array 11 10.55 1312 Minimum Insertion Steps to Make a String Palindrome Java Hard String, Dynamic_Programming 25 85.70 1311 Get Watched Videos by Your Friends Java Medium Array, Hash_Table, Sorting, Breadth_First_Search 39 73.81 1310 XOR Queries of a Subarray Java Medium Array, Bit_Manipulation, Prefix_Sum 3 68.91 1309 Decrypt String from Alphabet to Integer Mapping Java Easy String, Programming_Skills_I_Day_9_String 6 28.25 1307 Verbal Arithmetic Puzzle Java Hard Array, String, Math, Backtracking 6 95.74 1306 Jump Game III Java 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 Java Medium Depth_First_Search, Sorting, Tree, Binary_Tree, Binary_Search_Tree 25 63.82 1304 Find N Unique Integers Sum up to Zero Java Easy Array, Math 0 100.00 1302 Deepest Leaves Sum Java Medium Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree 5 59.50 1301 Number of Paths with Max Score Java Hard Array, Dynamic_Programming, Matrix 14 72.31 1300 Sum of Mutated Array Closest to Target Java Medium Array, Sorting, Binary_Search, Binary_Search_II_Day_16 7 33.33 1299 Replace Elements with Greatest Element on Right Side Java Easy Array 1 99.82 1298 Maximum Candies You Can Get from Boxes Java Hard Array, Breadth_First_Search 3 100.00 1297 Maximum Number of Occurrences of a Substring Java Medium String, Hash_Table, Sliding_Window 42 90.85 1296 Divide Array in Sets of K Consecutive Numbers Java Medium Array, Hash_Table, Sorting, Greedy 39 97.80 1295 Find Numbers with Even Number of Digits Java Easy Array 2 58.23 1293 Shortest Path in a Grid with Obstacles Elimination Java Hard Array, Breadth_First_Search, Matrix 35 63.17 1292 Maximum Side Length of a Square with Sum Less than or Equal to Threshold Java Medium Array, Binary_Search, Matrix, Prefix_Sum, Binary_Search_II_Day_15 23 32.97 1291 Sequential Digits Java Medium Enumeration 0 100.00 1290 Convert Binary Number in a Linked List to Integer Java Easy Math, Linked_List, Programming_Skills_I_Day_10_Linked_List_&_Tree 0 100.00 1289 Minimum Falling Path Sum II Java Hard Array, Dynamic_Programming, Matrix 2 99.45 1288 Remove Covered Intervals Java Medium Array, Sorting 6 78.87 1287 Element Appearing More Than 25% In Sorted Array Java Easy Array 0 100.00 1286 Iterator for Combination Java Medium String, Design, Backtracking, Iterator 10 95.00 1284 Minimum Number of Flips to Convert Binary Matrix to Zero Matrix Java Hard Array, Breadth_First_Search, Matrix, Bit_Manipulation 2 89.29 1283 Find the Smallest Divisor Given a Threshold Java Medium Array, Binary_Search, Binary_Search_II_Day_5 9 95.49 1282 Group the People Given the Group Size They Belong To Java Medium Array, Hash_Table 6 79.04 1281 Subtract the Product and Sum of Digits of an Integer Java Easy Math, Programming_Skills_I_Day_2_Operator 0 100.00 1278 Palindrome Partitioning III Java Hard String, Dynamic_Programming 4 89.93 1277 Count Square Submatrices with All Ones Java Medium Array, Dynamic_Programming, Matrix 5 95.33 1276 Number of Burgers with No Waste of Ingredients Java Medium Math 2 87.88 1275 Find Winner on a Tic Tac Toe Game Java Easy Array, Hash_Table, Matrix, Simulation 0 100.00 1269 Number of Ways to Stay in the Same Place After Some Steps Java Hard Dynamic_Programming 12 89.11 1268 Search Suggestions System Java Medium Array, String, Trie 28 78.06 1267 Count Servers that Communicate Java Medium Array, Depth_First_Search, Breadth_First_Search, Matrix, Counting, Union_Find 5 41.00 1266 Minimum Time Visiting All Points Java Easy Array, Math, Geometry 1 80.97 1263 Minimum Moves to Move a Box to Their Target Location Java Hard Array, Breadth_First_Search, Matrix, Heap_Priority_Queue 16 76.00 1262 Greatest Sum Divisible by Three Java Medium Array, Dynamic_Programming, Greedy 5 95.82 1261 Find Elements in a Contaminated Binary Tree Java Medium Hash_Table, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Design 24 84.00 1260 Shift 2D Grid Java Easy Array, Matrix, Simulation 17 14.82 1255 Maximum Score Words Formed by Letters Java Hard Array, String, Dynamic_Programming, Bit_Manipulation, Backtracking, Bitmask 1 98.36 1254 Number of Closed Islands Java 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 Java Medium Array, Greedy, Matrix 18 57.27 1252 Cells with Odd Values in a Matrix Java Easy Array, Math, Simulation 1 87.47 1250 Check If It Is a Good Array Java Hard Array, Math, Number_Theory 4 58.82 1249 Minimum Remove to Make Valid Parentheses Java Medium String, Stack, Data_Structure_II_Day_14_Stack_Queue 13 94.62 1248 Count Number of Nice Subarrays Java Medium Array, Hash_Table, Math, Sliding_Window 14 69.78 1247 Minimum Swaps to Make Strings Equal Java Medium String, Math, Greedy 1 79.83 1240 Tiling a Rectangle with the Fewest Squares Java Hard Dynamic_Programming, Backtracking 3 62.18 1239 Maximum Length of a Concatenated String with Unique Characters Java Medium Array, String, Bit_Manipulation, Backtracking 9 88.28 1238 Circular Permutation in Binary Representation Java Medium Math, Bit_Manipulation, Backtracking 4 100.00 1237 Find Positive Integer Solution for a Given Equation Java Medium Math, Binary_Search, Two_Pointers, Interactive 2 79.60 1235 Maximum Profit in Job Scheduling Java Hard Array, Dynamic_Programming, Sorting, Binary_Search 27 89.19 1234 Replace the Substring for Balanced String Java Medium String, Sliding_Window 7 89.84 1233 Remove Sub-Folders from the Filesystem Java Medium Array, String, Trie 32 96.54 1232 Check If It Is a Straight Line Java Easy Array, Math, Geometry, Programming_Skills_I_Day_5_Function 0 100.00 1227 Airplane Seat Assignment Probability Java Medium Dynamic_Programming, Math, Brainteaser, Probability_and_Statistics 1 15.63 1226 The Dining Philosophers Java Medium Concurrency 10 83.56 1224 Maximum Equal Frequency Java Hard Array, Hash_Table 17 93.59 1223 Dice Roll Simulation Java Hard Array, Dynamic_Programming 9 90.98 1222 Queens That Can Attack the King Java Medium Array, Matrix, Simulation 1 89.88 1221 Split a String in Balanced Strings Java Easy String, Greedy, Counting 1 53.71 1220 Count Vowels Permutation Java Hard Dynamic_Programming 7 98.50 1219 Path with Maximum Gold Java Medium Array, Matrix, Backtracking 48 57.00 1218 Longest Arithmetic Subsequence of Given Difference Java Medium Array, Hash_Table, Dynamic_Programming 11 98.23 1217 Minimum Cost to Move Chips to The Same Position Java Easy Array, Math, Greedy 0 100.00 1210 Minimum Moves to Reach Target with Rotations Java Hard Array, Breadth_First_Search, Matrix 29 78.57 1209 Remove All Adjacent Duplicates in String II Java Medium String, Stack 15 88.34 1208 Get Equal Substrings Within Budget Java Medium String, Binary_Search, Prefix_Sum, Sliding_Window 7 73.41 1207 Unique Number of Occurrences Java Easy Array, Hash_Table 8 5.98 1206 Design Skiplist Java Hard Design, Linked_List 14 96.71 1203 Sort Items by Groups Respecting Dependencies Java Hard Depth_First_Search, Breadth_First_Search, Graph, Topological_Sort 44 88.89 1202 Smallest String With Swaps Java Medium String, Hash_Table, Depth_First_Search, Breadth_First_Search, Union_Find 43 86.82 1201 Ugly Number III Java Medium Math, Binary_Search, Number_Theory, Binary_Search_II_Day_20 0 100.00 1200 Minimum Absolute Difference Java Easy Array, Sorting 14 98.30 1195 Fizz Buzz Multithreaded Java Medium Concurrency 8 80.09 1192 Critical Connections in a Network Java Hard Depth_First_Search, Graph, Biconnected_Component 127 89.39 1191 K-Concatenation Maximum Sum Java Medium Array, Dynamic_Programming 6 73.85 1190 Reverse Substrings Between Each Pair of Parentheses Java Medium String, Stack 1 98.26 1189 Maximum Number of Balloons Java Easy String, Hash_Table, Counting 3 68.13 1187 Make Array Strictly Increasing Java Hard Array, Dynamic_Programming, Binary_Search 33 95.51 1186 Maximum Subarray Sum with One Deletion Java Medium Array, Dynamic_Programming 3 94.48 1185 Day of the Week Java Easy Math 0 100.00 1184 Distance Between Bus Stops Java Easy Array 0 100.00 1179 Reformat Department Table Sql Easy Database 493 64.80 1178 Number of Valid Words for Each Puzzle Java Hard Array, String, Hash_Table, Bit_Manipulation, Trie 139 48.41 1177 Can Make Palindrome from Substring Java Medium String, Hash_Table, Bit_Manipulation, Prefix_Sum 13 93.08 1175 Prime Arrangements Java Easy Math 6 10.00 1172 Dinner Plate Stacks Java Hard Hash_Table, Stack, Design, Heap_Priority_Queue 63 96.74 1171 Remove Zero Sum Consecutive Nodes from Linked List Java Medium Hash_Table, Linked_List 2 90.39 1170 Compare Strings by Frequency of the Smallest Character Java Medium Array, String, Hash_Table, Sorting, Binary_Search 7 57.89 1169 Invalid Transactions Java Medium Array, String, Hash_Table, Sorting 11 89.89 1163 Last Substring in Lexicographical Order Java Hard String, Two_Pointers 12 96.43 1162 As Far from Land as Possible Java 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 Java Medium Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree 9 78.65 1160 Find Words That Can Be Formed by Characters Java Easy Array, String, Hash_Table 53 30.13 1158 Market Analysis I Sql Medium Database, SQL_I_Day_9_Control_of_Flow 1039 77.70 1157 Online Majority Element In Subarray Java Hard Array, Binary_Search, Design, Segment_Tree, Binary_Indexed_Tree 56 100.00 1156 Swap For Longest Repeated Character Substring Java Medium String, Sliding_Window 22 15.79 1155 Number of Dice Rolls With Target Sum Java Medium Dynamic_Programming 17 78.89 1154 Day of the Year Java Easy String, Math 9 95.40 1148 Article Views I Sql Easy Database, SQL_I_Day_5_Union 459 44.85 1147 Longest Chunked Palindrome Decomposition Java Hard String, Dynamic_Programming, Greedy, Two_Pointers, Hash_Function, Rolling_Hash 11 44.95 1146 Snapshot Array Java Medium Array, Hash_Table, Binary_Search, Design, Binary_Search_II_Day_18 37 87.93 1145 Binary Tree Coloring Game Java Medium Depth_First_Search, Tree, Binary_Tree 0 100.00 1144 Decrease Elements To Make Array Zigzag Java Medium Array, Greedy 0 100.00 1143 Longest Common Subsequence Java Medium 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 Sql Easy Database, SQL_I_Day_7_Function 543 29.24 1140 Stone Game II Java Medium Array, Dynamic_Programming, Math, Game_Theory 7 68.62 1139 Largest 1-Bordered Square Java Medium Array, Dynamic_Programming, Matrix 8 53.28 1138 Alphabet Board Path Java Medium String, Hash_Table 1 76.10 1137 N-th Tribonacci Number Java Easy Dynamic_Programming, Math, Memoization, Dynamic_Programming_I_Day_1 0 100.00 1131 Maximum of Absolute Value Expression Java Medium Array, Math 8 60.95 1130 Minimum Cost Tree From Leaf Values Java Medium Dynamic_Programming, Greedy, Stack, Monotonic_Stack 2 82.90 1129 Shortest Path with Alternating Colors Java Medium Breadth_First_Search, Graph, Graph_Theory_I_Day_10_Standard_Traversal 5 90.28 1128 Number of Equivalent Domino Pairs Java Easy Array, Hash_Table, Counting 10 69.88 1125 Smallest Sufficient Team Java Hard Array, Dynamic_Programming, Bit_Manipulation, Bitmask 3 98.82 1124 Longest Well-Performing Interval Java Medium Array, Hash_Table, Stack, Prefix_Sum, Monotonic_Stack 13 71.38 1123 Lowest Common Ancestor of Deepest Leaves Java Medium Hash_Table, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree 1 76.02 1122 Relative Sort Array Java Easy Array, Hash_Table, Sorting, Counting_Sort 0 100.00 1117 Building H2O Java Medium Concurrency 12 93.81 1116 Print Zero Even Odd Java Medium Concurrency 5 99.83 1115 Print FooBar Alternately Java Medium Concurrency 16 90.05 1114 Print in Order Java Easy Concurrency 16 77.21 1111 Maximum Nesting Depth of Two Valid Parentheses Strings Java Medium String, Stack 1 99.73 1110 Delete Nodes And Return Forest Java Medium Depth_First_Search, Tree, Binary_Tree 5 15.90 1109 Corporate Flight Bookings Java Medium Array, Prefix_Sum 3 87.75 1108 Defanging an IP Address Java Easy String 0 100.00 1106 Parsing A Boolean Expression Java Hard String, Stack, Recursion 3 93.78 1105 Filling Bookcase Shelves Java Medium Array, Dynamic_Programming 4 23.85 1104 Path In Zigzag Labelled Binary Tree Java Medium Math, Tree, Binary_Tree 1 58.50 1103 Distribute Candies to People Java Easy Math, Simulation 2 49.07 1096 Brace Expansion II Java Hard String, Breadth_First_Search, Stack, Backtracking 23 60.36 1095 Find in Mountain Array Java 1093 Statistics from a Large Sample Java Medium Math, Two_Pointers, Probability_and_Statistics 1 86.00 1092 Shortest Common Supersequence Java Hard String, Dynamic_Programming 10 96.12 1091 Shortest Path in Binary Matrix Java 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 Java Medium Array, Hash_Table, Sorting, Greedy, Counting 14 95.96 1089 Duplicate Zeros Java Easy Array, Two_Pointers 2 67.91 1084 Sales Analysis III Sql Easy Database, SQL_I_Day_10_Where 1066 69.71 1081 Smallest Subsequence of Distinct Characters Java Medium String, Greedy, Stack, Monotonic_Stack 2 97.16 1080 Insufficient Nodes in Root to Leaf Paths Java Medium Depth_First_Search, Tree, Binary_Tree 1 76.12 1079 Letter Tile Possibilities Java Medium String, Backtracking 3 86.86 1078 Occurrences After Bigram Java Easy String 0 100.00 1074 Number of Submatrices That Sum to Target Java Hard Array, Hash_Table, Matrix, Prefix_Sum 171 68.35 1073 Adding Two Negabinary Numbers Java Medium Array, Math 1 100.00 1072 Flip Columns For Maximum Number of Equal Rows Java Medium Array, Hash_Table, Matrix 26 95.71 1071 Greatest Common Divisor of Strings Java Easy String, Math 1 82.09 1054 Distant Barcodes Java Medium Array, Hash_Table, Sorting, Greedy, Heap_Priority_Queue, Counting 45 64.21 1053 Previous Permutation With One Swap Java Medium Array, Greedy 0 100.00 1052 Grumpy Bookstore Owner Java Medium Array, Sliding_Window 4 70.26 1051 Height Checker Java Easy Array, Sorting, Counting_Sort 1 94.01 1050 Actors and Directors Who Cooperated At Least Three Times Sql Easy Database, SQL_I_Day_10_Where 344 76.48 1049 Last Stone Weight II Java Medium Array, Dynamic_Programming 2 95.98 1048 Longest String Chain Java Medium Array, String, Hash_Table, Dynamic_Programming, Two_Pointers 23 97.92 1047 Remove All Adjacent Duplicates In String Java Easy String, Stack 3 99.99 1046 Last Stone Weight Java Easy Array, Heap_Priority_Queue 2 73.81 1044 Longest Duplicate Substring Java Hard String, Binary_Search, Sliding_Window, Hash_Function, Rolling_Hash, Suffix_Array 447 62.53 1043 Partition Array for Maximum Sum Java Medium Array, Dynamic_Programming 5 90.43 1042 Flower Planting With No Adjacent Java Medium Depth_First_Search, Breadth_First_Search, Graph 19 89.02 1041 Robot Bounded In Circle Java Medium String, Math, Simulation 0 100.00 1040 Moving Stones Until Consecutive II Java Medium Array, Math, Sorting, Two_Pointers 8 55.00 1039 Minimum Score Triangulation of Polygon Java Medium Array, Dynamic_Programming 6 38.60 1038 Binary Search Tree to Greater Sum Tree Java Medium Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree 0 100.00 1037 Valid Boomerang Java Easy Math, Geometry 0 100.00 1036 Escape a Large Maze Java Hard Array, Hash_Table, Depth_First_Search, Breadth_First_Search 115 73.46 1035 Uncrossed Lines Java Medium Array, Dynamic_Programming 5 85.32 1034 Coloring A Border Java Medium Array, Depth_First_Search, Breadth_First_Search, Matrix 1 93.85 1033 Moving Stones Until Consecutive Java Medium Math, Brainteaser 1 86.36 1032 Stream of Characters Java Hard Array, String, Design, Trie, Data_Stream 137 81.54 1031 Maximum Sum of Two Non-Overlapping Subarrays Java Medium Array, Dynamic_Programming, Sliding_Window 3 46.04 1030 Matrix Cells in Distance Order Java Easy Array, Math, Sorting, Matrix, Geometry 15 69.74 1029 Two City Scheduling Java Medium Array, Sorting, Greedy 1 97.54 1028 Recover a Tree From Preorder Traversal Java Hard String, Depth_First_Search, Tree, Binary_Tree 5 77.57 1027 Longest Arithmetic Subsequence Java Medium Array, Hash_Table, Dynamic_Programming, Binary_Search 47 98.28 1026 Maximum Difference Between Node and Ancestor Java Medium Depth_First_Search, Tree, Binary_Tree 1 65.84 1025 Divisor Game Java Easy Dynamic_Programming, Math, Game_Theory, Brainteaser 0 100.00 1024 Video Stitching Java Medium Array, Dynamic_Programming, Greedy 1 88.78 1023 Camelcase Matching Java Medium String, Two_Pointers, Trie, String_Matching 1 73.86 1022 Sum of Root To Leaf Binary Numbers Java Easy Depth_First_Search, Tree, Binary_Tree 3 28.58 1021 Remove Outermost Parentheses Java Easy String, Stack 4 75.39 1020 Number of Enclaves Java 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 Java Medium Array, Stack, Linked_List, Monotonic_Stack 11 96.35 1018 Binary Prefix Divisible By 5 Java Easy Array 3 84.58 1017 Convert to Base -2 Java Medium Math 2 34.15 1016 Binary String With Substrings Representing 1 To N Java Medium String 0 100.00 1015 Smallest Integer Divisible by K Java Medium Hash_Table, Math 2 90.67 1014 Best Sightseeing Pair Java Medium Array, Dynamic_Programming, Dynamic_Programming_I_Day_7 2 99.86 1013 Partition Array Into Three Parts With Equal Sum Java Easy Array, Greedy 3 53.27 1012 Numbers With Repeated Digits Java Hard Dynamic_Programming, Math 3 28.17 1011 Capacity To Ship Packages Within D Days Java Medium Array, Greedy, Binary_Search 10 75.31 1010 Pairs of Songs With Total Durations Divisible by 60 Java Medium Array, Hash_Table, Counting 4 64.39 1009 Complement of Base 10 Integer Java Easy Bit_Manipulation 1 41.56 1008 Construct Binary Search Tree from Preorder Traversal Java Medium Array, Tree, Binary_Tree, Stack, Monotonic_Stack, Binary_Search_Tree 0 100.00 1007 Minimum Domino Rotations For Equal Row Java Medium Array, Greedy 5 79.64 1006 Clumsy Factorial Java Medium Math, Stack, Simulation 1 87.97 1005 Maximize Sum Of Array After K Negations Java Easy Array, Sorting, Greedy 3 81.75 1004 Max Consecutive Ones III Java Medium Array, Binary_Search, Prefix_Sum, Sliding_Window 3 79.01 1003 Check If Word Is Valid After Substitutions Java Medium String, Stack 5 98.54 1002 Find Common Characters Java Easy Array, String, Hash_Table 4 83.51 1001 Grid Illumination Java Hard Array, Hash_Table 75 90.57 1000 Minimum Cost to Merge Stones Java Hard Array, Dynamic_Programming 1 99.65 0999 Available Captures for Rook Java Easy Array, Matrix, Simulation 0 100.00 0998 Maximum Binary Tree II Java Medium Tree, Binary_Tree 0 100.00 0997 Find the Town Judge Java 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 Java Hard Array, Dynamic_Programming, Math, Bit_Manipulation, Backtracking, Bitmask 2 72.32 0995 Minimum Number of K Consecutive Bit Flips Java Hard Array, Bit_Manipulation, Prefix_Sum, Sliding_Window 6 93.95 0994 Rotting Oranges Java Medium Array, Breadth_First_Search, Matrix, Algorithm_I_Day_9_Breadth_First_Search_Depth_First_Search 3 74.27 0993 Cousins in Binary Tree Java Easy Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree 1 60.08 0992 Subarrays with K Different Integers Java Hard Array, Hash_Table, Counting, Sliding_Window 4 99.36 0991 Broken Calculator Java Medium Math, Greedy 0 100.00 0990 Satisfiability of Equality Equations Java Medium Array, String, Graph, Union_Find 5 24.79 0989 Add to Array-Form of Integer Java Easy Array, Math, Programming_Skills_II_Day_5 7 65.92 0988 Smallest String Starting From Leaf Java Medium String, Depth_First_Search, Tree, Binary_Tree 4 58.47 0987 Vertical Order Traversal of a Binary Tree Java Hard Hash_Table, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree 4 71.48 0986 Interval List Intersections Java Medium Array, Two_Pointers, Algorithm_II_Day_4_Two_Pointers 2 99.95 0985 Sum of Even Numbers After Queries Java Medium Array, Simulation 6 71.11 0984 String Without AAA or BBB Java Medium String, Greedy 0 100.00 0983 Minimum Cost For Tickets Java Medium Array, Dynamic_Programming 1 93.95 0982 Triples with Bitwise AND Equal To Zero Java Hard Array, Hash_Table, Bit_Manipulation 120 79.59 0981 Time Based Key-Value Store Java Medium String, Hash_Table, Binary_Search, Design, Binary_Search_II_Day_16 239 72.78 0980 Unique Paths III Java Hard Array, Matrix, Bit_Manipulation, Backtracking 0 100.00 0979 Distribute Coins in Binary Tree Java Medium Depth_First_Search, Tree, Binary_Tree 0 100.00 0978 Longest Turbulent Subarray Java Medium Array, Dynamic_Programming, Sliding_Window 7 48.10 0977 Squares of a Sorted Array Java Easy Array, Sorting, Two_Pointers, Algorithm_I_Day_2_Two_Pointers 1 100.00 0976 Largest Perimeter Triangle Java Easy Array, Math, Sorting, Greedy, Programming_Skills_I_Day_3_Conditional_Statements 12 26.01 0975 Odd Even Jump Java Hard Array, Dynamic_Programming, Stack, Ordered_Set, Monotonic_Stack 49 98.38 0974 Subarray Sums Divisible by K Java Medium Array, Hash_Table, Prefix_Sum 3 99.95 0973 K Closest Points to Origin Java 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 Java Hard String, Math 4 56.67 0971 Flip Binary Tree To Match Preorder Traversal Java Medium Depth_First_Search, Tree, Binary_Tree 0 100.00 0970 Powerful Integers Java Medium Hash_Table, Math 1 100.00 0969 Pancake Sorting Java Medium Array, Sorting, Greedy, Two_Pointers 1 100.00 0968 Binary Tree Cameras Java Hard Dynamic_Programming, Depth_First_Search, Tree, Binary_Tree 0 100.00 0967 Numbers With Same Consecutive Differences Java Medium Breadth_First_Search, Backtracking 1 100.00 0966 Vowel Spellchecker Java Medium Array, String, Hash_Table 17 98.95 0965 Univalued Binary Tree Java Easy Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree 1 17.57 0964 Least Operators to Express Number Java Hard Dynamic_Programming, Math 16 37.78 0963 Minimum Area Rectangle II Java Medium Array, Math, Geometry 12 92.95 0962 Maximum Width Ramp Java Medium Array, Stack, Monotonic_Stack 6 90.69 0961 N-Repeated Element in Size 2N Array Java Easy Array, Hash_Table 1 87.33 0960 Delete Columns to Make Sorted III Java Hard Array, String, Dynamic_Programming 13 43.86 0959 Regions Cut By Slashes Java Medium Depth_First_Search, Breadth_First_Search, Graph, Union_Find 9 39.29 0958 Check Completeness of a Binary Tree Java Medium Breadth_First_Search, Tree, Binary_Tree 2 43.56 0957 Prison Cells After N Days Java Medium Array, Hash_Table, Math, Bit_Manipulation 1 97.82 0956 Tallest Billboard Java Hard Array, Dynamic_Programming 18 92.68 0955 Delete Columns to Make Sorted II Java Medium Array, String, Greedy 2 68.84 0954 Array of Doubled Pairs Java Medium Array, Hash_Table, Sorting, Greedy 18 97.19 0953 Verifying an Alien Dictionary Java Easy Array, String, Hash_Table, Programming_Skills_I_Day_9_String 0 100.00 0952 Largest Component Size by Common Factor Java Hard Array, Math, Union_Find 225 76.99 0951 Flip Equivalent Binary Trees Java Medium Depth_First_Search, Tree, Binary_Tree 0 100.00 0950 Reveal Cards In Increasing Order Java Medium Array, Sorting, Simulation, Queue 1 100.00 0949 Largest Time for Given Digits Java Medium String, Enumeration 3 91.21 0948 Bag of Tokens Java Medium Array, Sorting, Greedy, Two_Pointers 4 32.05 0947 Most Stones Removed with Same Row or Column Java Medium Depth_First_Search, Graph, Union_Find 5 98.95 0946 Validate Stack Sequences Java Medium Array, Stack, Simulation 6 20.54 0945 Minimum Increment to Make Array Unique Java Medium Array, Sorting, Greedy, Counting 9 95.25 0944 Delete Columns to Make Sorted Java Easy Array, String 11 59.39 0943 Find the Shortest Superstring Java Hard Array, String, Dynamic_Programming, Bit_Manipulation, Bitmask 16 100.00 0942 DI String Match Java Easy Array, String, Math, Greedy, Two_Pointers 4 33.74 0941 Valid Mountain Array Java Easy Array 1 100.00 0940 Distinct Subsequences II Java Hard String, Dynamic_Programming 2 99.41 0939 Minimum Area Rectangle Java Medium Array, Hash_Table, Math, Sorting, Geometry 63 94.31 0938 Range Sum of BST Java Easy Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree 0 100.00 0937 Reorder Data in Log Files Java Easy Array, String, Sorting 4 92.15 0936 Stamping The Sequence Java Hard String, Greedy, Stack, Queue 6 78.43 0935 Knight Dialer Java Medium Dynamic_Programming 4 99.08 0934 Shortest Bridge Java 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 Java Easy Design, Queue, Data_Stream 16 97.58 0932 Beautiful Array Java Medium Array, Math, Divide_and_Conquer 1 89.66 0931 Minimum Falling Path Sum Java Medium Array, Dynamic_Programming, Matrix, Dynamic_Programming_I_Day_13 4 72.19 0930 Binary Subarrays With Sum Java Medium Array, Hash_Table, Prefix_Sum, Sliding_Window 3 84.84 0929 Unique Email Addresses Java Easy Array, String, Hash_Table 10 92.59 0928 Minimize Malware Spread II Java Hard Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find 41 31.01 0927 Three Equal Parts Java Hard Array, Math 2 90.20 0926 Flip String to Monotone Increasing Java Medium String, Dynamic_Programming 12 63.41 0925 Long Pressed Name Java Easy String, Two_Pointers 1 84.87 0924 Minimize Malware Spread Java Hard Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find 127 5.44 0923 3Sum With Multiplicity Java Medium Array, Hash_Table, Sorting, Two_Pointers, Counting 14 69.20 0922 Sort Array By Parity II Java Easy Array, Sorting, Two_Pointers 4 52.95 0921 Minimum Add to Make Parentheses Valid Java Medium String, Greedy, Stack 2 33.69 0920 Number of Music Playlists Java Hard Dynamic_Programming, Math, Combinatorics 2 96.55 0919 Complete Binary Tree Inserter Java Medium Breadth_First_Search, Tree, Binary_Tree, Design 11 96.06 0918 Maximum Sum Circular Subarray Java Medium Array, Dynamic_Programming, Divide_and_Conquer, Queue, Monotonic_Queue, Dynamic_Programming_I_Day_5 3 92.86 0917 Reverse Only Letters Java Easy String, Two_Pointers 0 100.00 0916 Word Subsets Java Medium Array, String, Hash_Table 30 57.30 0915 Partition Array into Disjoint Intervals Java Medium Array 2 99.81 0914 X of a Kind in a Deck of Cards Java Easy Array, Hash_Table, Math, Counting, Number_Theory 16 19.29 0913 Cat and Mouse Java Hard Dynamic_Programming, Math, Breadth_First_Search, Graph, Memoization, Game_Theory 16 97.20 0912 Sort an Array Java Medium Array, Sorting, Heap_Priority_Queue, Divide_and_Conquer, Merge_Sort, Bucket_Sort, Counting_Sort, Radix_Sort 25 38.15 0911 Online Election Java Medium Array, Hash_Table, Binary_Search, Design, Binary_Search_II_Day_20 63 98.81 0910 Smallest Range II Java Medium Array, Math, Sorting, Greedy, Programming_Skills_II_Day_13 10 73.16 0909 Snakes and Ladders Java Medium Array, Breadth_First_Search, Matrix 7 79.52 0908 Smallest Range I Java Easy Array, Math 2 88.84 0907 Sum of Subarray Minimums Java Medium Array, Dynamic_Programming, Stack, Monotonic_Stack 20 95.88 0906 Super Palindromes Java Hard Math, Enumeration 229 91.38 0905 Sort Array By Parity Java Easy Array, Sorting, Two_Pointers 1 95.51 0904 Fruit Into Baskets Java Medium Array, Hash_Table, Sliding_Window 6 95.60 0903 Valid Permutations for DI Sequence Java Hard Dynamic_Programming 3 74.00 0902 Numbers At Most N Given Digit Set Java Hard Array, Dynamic_Programming, Math, Binary_Search 2 18.29 0901 Online Stock Span Java Medium Stack, Design, Monotonic_Stack, Data_Stream 47 76.17 0900 RLE Iterator Java Medium Array, Design, Counting, Iterator 3 100.00 0899 Orderly Queue Java Hard String, Math, Sorting 1 100.00 0898 Bitwise ORs of Subarrays Java Medium Array, Dynamic_Programming, Bit_Manipulation 151 97.74 0897 Increasing Order Search Tree Java Easy Depth_First_Search, Tree, Binary_Tree, Stack, Binary_Search_Tree 0 100.00 0896 Monotonic Array Java Easy Array, Programming_Skills_II_Day_1 2 86.21 0895 Maximum Frequency Stack Java Hard Hash_Table, Stack, Design, Ordered_Set 43 65.81 0894 All Possible Full Binary Trees Java Medium Dynamic_Programming, Tree, Binary_Tree, Recursion, Memoization 3 68.56 0893 Groups of Special-Equivalent Strings Java Medium Array, String, Hash_Table 3 99.09 0892 Surface Area of 3D Shapes Java Easy Array, Math, Matrix, Geometry 2 98.73 0891 Sum of Subsequence Widths Java Hard Array, Math, Sorting 56 30.61 0890 Find and Replace Pattern Java Medium Array, String, Hash_Table 1 97.13 0889 Construct Binary Tree from Preorder and Postorder Traversal Java Medium Array, Hash_Table, Tree, Binary_Tree, Divide_and_Conquer 1 91.04 0888 Fair Candy Swap Java Easy Array, Hash_Table, Sorting, Binary_Search 18 68.20 0887 Super Egg Drop Java Hard Dynamic_Programming, Math, Binary_Search 0 100.00 0886 Possible Bipartition Java Medium Depth_First_Search, Breadth_First_Search, Graph, Union_Find, Graph_Theory_I_Day_14_Graph_Theory 20 80.12 0885 Spiral Matrix III Java Medium Array, Matrix, Simulation 3 95.45 0884 Uncommon Words from Two Sentences Java Easy String, Hash_Table 1 100.00 0883 Projection Area of 3D Shapes Java Easy Array, Math, Matrix, Geometry 1 100.00 0882 Reachable Nodes In Subdivided Graph Java Hard Heap_Priority_Queue, Graph, Shortest_Path 28 95.85 0881 Boats to Save People Java Medium Array, Sorting, Greedy, Two_Pointers 20 61.11 0880 Decoded String at Index Java Medium String, Stack 0 100.00 0879 Profitable Schemes Java Hard Array, Dynamic_Programming 80 43.42 0878 Nth Magical Number Java Hard Math, Binary_Search 0 100.00 0877 Stone Game Java Medium Array, Dynamic_Programming, Math, Game_Theory 0 100.00 0876 Middle of the Linked List Java Easy Two_Pointers, Linked_List, Algorithm_I_Day_5_Two_Pointers, Programming_Skills_I_Day_10_Linked_List_&_Tree 0 100.00 0875 Koko Eating Bananas Java Medium Array, Binary_Search, Binary_Search_II_Day_4 15 91.32 0874 Walking Robot Simulation Java Medium Array, Simulation 16 93.75 0873 Length of Longest Fibonacci Subsequence Java Medium Array, Hash_Table, Dynamic_Programming 120 92.64 0872 Leaf-Similar Trees Java Easy Depth_First_Search, Tree, Binary_Tree 0 100.00 0871 Minimum Number of Refueling Stops Java Hard Array, Dynamic_Programming, Greedy, Heap_Priority_Queue 3 88.52 0870 Advantage Shuffle Java Medium Array, Sorting, Greedy 188 28.01 0869 Reordered Power of 2 Java Medium Math, Sorting, Counting, Enumeration 9 25.97 0868 Binary Gap Java Easy Math, Bit_Manipulation 3 9.45 0867 Transpose Matrix Java Easy Array, Matrix, Simulation 1 60.83 0866 Prime Palindrome Java Medium Math 2 84.68 0865 Smallest Subtree with all the Deepest Nodes Java Medium Hash_Table, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree 0 100.00 0864 Shortest Path to Get All Keys Java Hard Breadth_First_Search, Bit_Manipulation 12 100.00 0863 All Nodes Distance K in Binary Tree Java Medium Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree 12 80.25 0862 Shortest Subarray with Sum at Least K Java Hard Array, Binary_Search, Heap_Priority_Queue, Prefix_Sum, Sliding_Window, Queue, Monotonic_Queue 53 74.73 0861 Score After Flipping Matrix Java Medium Array, Greedy, Matrix, Bit_Manipulation 1 70.04 0860 Lemonade Change Java Easy Array, Greedy, Programming_Skills_II_Day_17 2 90.84 0859 Buddy Strings Java Easy String, Hash_Table 2 85.33 0858 Mirror Reflection Java Medium Math, Geometry 0 100.00 0857 Minimum Cost to Hire K Workers Java Hard Array, Sorting, Greedy, Heap_Priority_Queue 26 85.40 0856 Score of Parentheses Java Medium String, Stack 1 67.71 0855 Exam Room Java Medium Design, Ordered_Set 19 74.01 0854 K-Similar Strings Java Hard String, Breadth_First_Search 2 99.58 0853 Car Fleet Java Medium Array, Sorting, Stack, Monotonic_Stack 118 74.11 0852 Peak Index in a Mountain Array Java Easy Array, Binary_Search, Binary_Search_I_Day_2 0 100.00 0851 Loud and Rich Java Medium Array, Depth_First_Search, Graph, Topological_Sort 3 99.67 0850 Rectangle Area II Java Hard Array, Ordered_Set, Segment_Tree, Line_Sweep 4 97.00 0849 Maximize Distance to Closest Person Java Medium Array 1 100.00 0848 Shifting Letters Java Medium Array, String 11 88.11 0847 Shortest Path Visiting All Nodes Java Hard Dynamic_Programming, Breadth_First_Search, Bit_Manipulation, Graph, Bitmask, Graph_Theory_I_Day_10_Standard_Traversal 14 78.72 0846 Hand of Straights Java Medium Array, Hash_Table, Sorting, Greedy 19 96.16 0845 Longest Mountain in Array Java Medium Array, Dynamic_Programming, Two_Pointers, Enumeration 2 94.37 0844 Backspace String Compare Java Easy String, Two_Pointers, Stack, Simulation, Algorithm_II_Day_4_Two_Pointers 0 100.00 0843 Guess the Word Java Hard Array, String, Math, Game_Theory, Interactive 2 68.01 0842 Split Array into Fibonacci Sequence Java Medium String, Backtracking 4 62.81 0841 Keys and Rooms Java 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 Java Medium Array, Math, Matrix 0 100.00 0839 Similar String Groups Java Hard Array, String, Depth_First_Search, Breadth_First_Search, Union_Find 15 80.39 0838 Push Dominoes Java Medium String, Dynamic_Programming, Two_Pointers 21 73.78 0837 New 21 Game Java Medium Dynamic_Programming, Math, Sliding_Window, Probability_and_Statistics 5 77.70 0836 Rectangle Overlap Java Easy Math, Geometry 0 100.00 0835 Image Overlap Java Medium Array, Matrix 6 98.73 0834 Sum of Distances in Tree Java Hard Dynamic_Programming, Depth_First_Search, Tree, Graph 52 91.09 0833 Find And Replace in String Java Medium Array, String, Sorting 3 70.10 0832 Flipping an Image Java Easy Array, Matrix, Two_Pointers, Simulation 1 68.54 0831 Masking Personal Information Java Medium String 1 84.30 0830 Positions of Large Groups Java Easy String 2 80.94 0829 Consecutive Numbers Sum Java Hard Math, Enumeration 3 93.37 0828 Count Unique Characters of All Substrings of a Given String Java Hard String, Dynamic_Programming 101 18.42 0827 Making A Large Island Java Hard Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find 147 74.37 0826 Most Profit Assigning Work Java Medium Array, Sorting, Greedy, Binary_Search, Two_Pointers, Binary_Search_II_Day_11 21 83.83 0825 Friends Of Appropriate Ages Java Medium Array, Sorting, Binary_Search, Two_Pointers 3 87.71 0824 Goat Latin Java Easy String 2 94.82 0823 Binary Trees With Factors Java Medium Array, Hash_Table, Dynamic_Programming 28 80.54 0822 Card Flipping Game Java Medium Array, Hash_Table 2 96.55 0821 Shortest Distance to a Character Java Easy Array, String, Two_Pointers 3 42.73 0820 Short Encoding of Words Java Medium Array, String, Hash_Table, Trie 35 49.44 0819 Most Common Word Java Easy String, Hash_Table, Counting 10 88.85 0818 Race Car Java Hard Dynamic_Programming 9 82.90 0817 Linked List Components Java Medium Hash_Table, Linked_List 7 76.10 0816 Ambiguous Coordinates Java Medium String, Backtracking 4 98.95 0815 Bus Routes Java Hard Array, Hash_Table, Breadth_First_Search 49 89.11 0814 Binary Tree Pruning Java Medium Depth_First_Search, Tree, Binary_Tree 0 100.00 0813 Largest Sum of Averages Java Medium Array, Dynamic_Programming 4 97.01 0812 Largest Triangle Area Java Easy Array, Math, Geometry 5 92.04 0811 Subdomain Visit Count Java Medium Array, String, Hash_Table, Counting 5 100.00 0810 Chalkboard XOR Game Java Hard Array, Math, Bit_Manipulation, Game_Theory, Brainteaser 0 100.00 0809 Expressive Words Java Medium Array, String, Two_Pointers 2 86.09 0808 Soup Servings Java Medium Dynamic_Programming, Math, Probability_and_Statistics 1 96.04 0807 Max Increase to Keep City Skyline Java Medium Array, Greedy, Matrix 2 23.49 0806 Number of Lines To Write String Java Easy Array, String 1 65.23 0805 Split Array With Same Average Java Hard Array, Dynamic_Programming, Math, Bit_Manipulation, Bitmask 1323 22.41 0804 Unique Morse Code Words Java Easy Array, String, Hash_Table 2 89.27 0803 Bricks Falling When Hit Java Hard Array, Matrix, Union_Find 12 94.92 0802 Find Eventual Safe States Java 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 Java Hard Array, Dynamic_Programming 6 71.94 0799 Champagne Tower Java Medium Dynamic_Programming 4 92.45 0798 Smallest Rotation with Highest Score Java Hard Array, Prefix_Sum 9 78.22 0797 All Paths From Source to Target Java 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 Java Easy String, String_Matching 0 100.00 0795 Number of Subarrays with Bounded Maximum Java Medium Array, Two_Pointers 2 100.00 0794 Valid Tic-Tac-Toe State Java Medium Array, String 0 100.00 0793 Preimage Size of Factorial Zeroes Function Java Hard Math, Binary_Search 0 100.00 0792 Number of Matching Subsequences Java Medium String, Hash_Table, Sorting, Trie 92 84.26 0791 Custom Sort String Java Medium String, Hash_Table, Sorting 1 78.82 0790 Domino and Tromino Tiling Java Medium Dynamic_Programming 0 100.00 0789 Escape The Ghosts Java Medium Array, Math 0 100.00 0788 Rotated Digits Java Medium Dynamic_Programming, Math 2 98.95 0787 Cheapest Flights Within K Stops Java Medium Dynamic_Programming, Depth_First_Search, Breadth_First_Search, Heap_Priority_Queue, Graph, Shortest_Path 9 53.93 0786 K-th Smallest Prime Fraction Java Hard Array, Binary_Search, Heap_Priority_Queue 2 96.60 0785 Is Graph Bipartite? Java Medium Depth_First_Search, Breadth_First_Search, Graph, Union_Find, Graph_Theory_I_Day_14_Graph_Theory 0 100.00 0784 Letter Case Permutation Java Medium String, Bit_Manipulation, Backtracking, Algorithm_I_Day_11_Recursion_Backtracking 10 40.38 0783 Minimum Distance Between BST Nodes Java Easy Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Binary_Search_Tree 0 100.00 0782 Transform to Chessboard Java Hard Array, Math, Matrix, Bit_Manipulation 2 53.57 0781 Rabbits in Forest Java Medium Array, Hash_Table, Math, Greedy 1 99.15 0780 Reaching Points Java Hard Math 0 100.00 0779 K-th Symbol in Grammar Java Medium Math, Bit_Manipulation, Recursion 0 100.00 0778 Swim in Rising Water Java 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 Java Medium String, Two_Pointers 4 85.13 0775 Global and Local Inversions Java Medium Array, Math 1 99.74 0773 Sliding Puzzle Java Hard Array, Breadth_First_Search, Matrix 9 81.80 0771 Jewels and Stones Java Easy String, Hash_Table 1 91.74 0770 Basic Calculator IV Java Hard String, Hash_Table, Math, Stack, Recursion 17 66.18 0769 Max Chunks To Make Sorted Java Medium Array, Sorting, Greedy, Stack, Monotonic_Stack 0 100.00 0768 Max Chunks To Make Sorted II Java Hard Array, Sorting, Greedy, Stack, Monotonic_Stack 1 87.58 0767 Reorganize String Java Medium String, Hash_Table, Sorting, Greedy, Heap_Priority_Queue, Counting 1 94.60 0766 Toeplitz Matrix Java Easy Array, Matrix 1 83.45 0765 Couples Holding Hands Java Hard Depth_First_Search, Greedy, Breadth_First_Search, Graph, Union_Find 0 100.00 0764 Largest Plus Sign Java Medium Array, Dynamic_Programming 39 87.23 0763 Partition Labels Java 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 Java Easy Math, Bit_Manipulation 4 98.39 0761 Special Binary String Java Hard String, Recursion 1 100.00 0757 Set Intersection Size At Least Two Java Hard Array, Sorting, Greedy 4 100.00 0756 Pyramid Transition Matrix Java Medium Depth_First_Search, Breadth_First_Search, Bit_Manipulation 129 82.94 0754 Reach a Number Java Medium Math, Binary_Search 0 100.00 0753 Cracking the Safe Java Hard Depth_First_Search, Graph, Eulerian_Circuit 4 96.44 0752 Open the Lock Java Medium Array, String, Hash_Table, Breadth_First_Search, Graph_Theory_I_Day_12_Breadth_First_Search 72 91.06 0749 Contain Virus Java Hard Array, Depth_First_Search, Breadth_First_Search, Matrix, Simulation 23 37.62 0748 Shortest Completing Word Java Easy Array, String, Hash_Table 3 93.75 0747 Largest Number At Least Twice of Others Java Easy Array, Sorting 0 100.00 0746 Min Cost Climbing Stairs Java Easy Array, Dynamic_Programming, Dynamic_Programming_I_Day_2 1 86.38 0745 Prefix and Suffix Search Java Hard String, Design, Trie 366 76.15 0744 Find Smallest Letter Greater Than Target Java Easy Array, Binary_Search, Binary_Search_I_Day_4 0 100.00 0743 Network Delay Time Java Medium Depth_First_Search, Breadth_First_Search, Heap_Priority_Queue, Graph, Shortest_Path 3 99.87 0741 Cherry Pickup Java Hard Array, Dynamic_Programming, Matrix 11 99.40 0740 Delete and Earn Java Medium Array, Hash_Table, Dynamic_Programming, Dynamic_Programming_I_Day_3 4 77.68 0739 Daily Temperatures Java Medium Top_100_Liked_Questions, Array, Stack, Monotonic_Stack, Programming_Skills_II_Day_6 10 94.99 0738 Monotone Increasing Digits Java Medium Math, Greedy 0 100.00 0736 Parse Lisp Expression Java Hard String, Hash_Table, Stack, Recursion 4 95.58 0735 Asteroid Collision Java Medium Array, Stack 2 99.59 0733 Flood Fill Java 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 1 85.36 0732 My Calendar III Java Hard Design, Ordered_Set, Segment_Tree 40 95.37 0731 My Calendar II Java Medium Design, Ordered_Set, Segment_Tree 27 97.74 0730 Count Different Palindromic Subsequences Java Hard String, Dynamic_Programming 45 92.84 0729 My Calendar I Java Medium Design, Ordered_Set, Segment_Tree, Programming_Skills_II_Day_20 17 97.23 0728 Self Dividing Numbers Java Easy Math 1 100.00 0726 Number of Atoms Java Hard String, Hash_Table, Sorting, Stack 4 87.22 0725 Split Linked List in Parts Java Medium Linked_List 1 30.85 0724 Find Pivot Index Java Easy Array, Prefix_Sum 2 69.67 0722 Remove Comments Java Medium Array, String 1 80.24 0721 Accounts Merge Java Medium Array, String, Depth_First_Search, Breadth_First_Search, Union_Find 71 31.21 0720 Longest Word in Dictionary Java Medium Array, String, Hash_Table, Sorting, Trie 13 84.66 0719 Find K-th Smallest Pair Distance Java Hard Array, Sorting, Binary_Search, Two_Pointers 8 81.40 0718 Maximum Length of Repeated Subarray Java Medium Array, Dynamic_Programming, Binary_Search, Sliding_Window, Hash_Function, Rolling_Hash 58 77.21 0717 1-bit and 2-bit Characters Java Easy Array 0 100.00 0715 Range Module Java Hard Design, Ordered_Set, Segment_Tree 35 98.62 0714 Best Time to Buy and Sell Stock with Transaction Fee Java Medium Array, Dynamic_Programming, Greedy, Dynamic_Programming_I_Day_8 4 78.57 0713 Subarray Product Less Than K Java 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 Java Medium String, Dynamic_Programming 18 91.28 0710 Random Pick with Blacklist Java Hard Hash_Table, Math, Sorting, Binary_Search, Randomized 56 74.41 0709 To Lower Case Java Easy String, Programming_Skills_I_Day_9_String 1 71.74 0707 Design Linked List Java Medium Design, Linked_List, Data_Structure_II_Day_12_Linked_List, Programming_Skills_II_Day_19 10 70.60 0706 Design HashMap Java Easy Array, Hash_Table, Design, Linked_List, Hash_Function, Data_Structure_II_Day_2_Array 13 95.71 0705 Design HashSet Java Easy Array, Hash_Table, Design, Linked_List, Hash_Function 29 57.06 0704 Binary Search Java Easy Array, Binary_Search, Algorithm_I_Day_1_Binary_Search, Binary_Search_I_Day_1 0 100.00 0703 Kth Largest Element in a Stream Java Easy Tree, Binary_Tree, Design, Heap_Priority_Queue, Binary_Search_Tree, Data_Stream 22 52.43 0701 Insert into a Binary Search Tree Java Medium Tree, Binary_Tree, Binary_Search_Tree, Data_Structure_I_Day_13_Tree 0 100.00 0700 Search in a Binary Search Tree Java Easy Tree, Binary_Tree, Binary_Search_Tree, Data_Structure_I_Day_13_Tree 0 100.00 0699 Falling Squares Java Hard Array, Ordered_Set, Segment_Tree 8 91.03 0698 Partition to K Equal Sum Subsets Java Medium Array, Dynamic_Programming, Bit_Manipulation, Backtracking, Bitmask, Memoization 24 85.43 0697 Degree of an Array Java Easy Array, Hash_Table 14 93.19 0696 Count Binary Substrings Java Easy String, Two_Pointers 5 100.00 0695 Max Area of Island Java 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 Java Easy Bit_Manipulation 0 100.00 0692 Top K Frequent Words Java Medium String, Hash_Table, Sorting, Heap_Priority_Queue, Counting, Trie, Bucket_Sort 11 38.54 0691 Stickers to Spell Word Java Hard Dynamic_Programming, Bit_Manipulation, Backtracking, Bitmask 34 70.23 0690 Employee Importance Java Medium Hash_Table, Depth_First_Search, Breadth_First_Search 7 77.84 0689 Maximum Sum of 3 Non-Overlapping Subarrays Java Hard Array, Dynamic_Programming 5 64.24 0688 Knight Probability in Chessboard Java Medium Dynamic_Programming 7 85.13 0687 Longest Univalue Path Java Medium Depth_First_Search, Tree, Binary_Tree 3 79.43 0686 Repeated String Match Java Medium String, String_Matching 7 94.56 0685 Redundant Connection II Java Hard Depth_First_Search, Breadth_First_Search, Graph, Union_Find 1 96.65 0684 Redundant Connection Java Medium Depth_First_Search, Breadth_First_Search, Graph, Union_Find 0 100.00 0682 Baseball Game Java Easy Array, Stack, Simulation 4 57.60 0680 Valid Palindrome II Java Easy String, Greedy, Two_Pointers 10 61.31 0679 24 Game Java Hard Array, Math, Backtracking 3 87.01 0678 Valid Parenthesis String Java Medium String, Dynamic_Programming, Greedy, Stack 0 100.00 0677 Map Sum Pairs Java Medium String, Hash_Table, Design, Trie 17 70.10 0676 Implement Magic Dictionary Java Medium String, Hash_Table, Design, Trie 38 86.83 0675 Cut Off Trees for Golf Event Java Hard Array, Breadth_First_Search, Matrix, Heap_Priority_Queue 417 73.86 0674 Longest Continuous Increasing Subsequence Java Easy Array 2 40.35 0673 Number of Longest Increasing Subsequence Java Medium Array, Dynamic_Programming, Segment_Tree, Binary_Indexed_Tree, Algorithm_II_Day_16_Dynamic_Programming 25 68.75 0672 Bulb Switcher II Java Medium Math, Depth_First_Search, Breadth_First_Search, Bit_Manipulation 0 100.00 0671 Second Minimum Node In a Binary Tree Java Easy Depth_First_Search, Tree, Binary_Tree 0 100.00 0670 Maximum Swap Java Medium Math, Greedy 1 80.14 0669 Trim a Binary Search Tree Java Medium Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree 0 100.00 0668 Kth Smallest Number in Multiplication Table Java Hard Binary_Search 12 97.84 0667 Beautiful Arrangement II Java Medium Array, Math 1 84.62 0665 Non-decreasing Array Java Medium Array 1 86.75 0664 Strange Printer Java Hard String, Dynamic_Programming 24 76.35 0662 Maximum Width of Binary Tree Java Medium Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree 2 78.93 0661 Image Smoother Java Easy Array, Matrix 2 100.00 0659 Split Array into Consecutive Subsequences Java Medium Array, Hash_Table, Greedy, Heap_Priority_Queue 4 95.88 0658 Find K Closest Elements Java Medium Array, Sorting, Binary_Search, Two_Pointers, Heap_Priority_Queue, Binary_Search_II_Day_2 3 99.20 0657 Robot Return to Origin Java Easy String, Simulation 3 99.87 0655 Print Binary Tree Java Medium Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree 1 98.04 0654 Maximum Binary Tree Java Medium Array, Tree, Binary_Tree, Stack, Monotonic_Stack, Divide_and_Conquer 3 84.36 0653 Two Sum IV - Input is a BST Java 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 Java Medium Hash_Table, Depth_First_Search, Tree, Binary_Tree 32 60.16 0650 2 Keys Keyboard Java Medium Dynamic_Programming, Math 0 100.00 0649 Dota2 Senate Java Medium String, Greedy, Queue 4 95.00 0648 Replace Words Java Medium Array, String, Hash_Table, Trie 14 87.12 0647 Palindromic Substrings Java Medium String, Dynamic_Programming 2 98.77 0646 Maximum Length of Pair Chain Java Medium Array, Dynamic_Programming, Sorting, Greedy 11 88.84 0645 Set Mismatch Java Easy Array, Hash_Table, Sorting, Bit_Manipulation 2 97.45 0643 Maximum Average Subarray I Java Easy Array, Sliding_Window 5 74.81 0641 Design Circular Deque Java Medium Array, Design, Linked_List, Queue 3 100.00 0640 Solve the Equation Java Medium String, Math, Simulation 5 69.29 0639 Decode Ways II Java Hard String, Dynamic_Programming 22 93.12 0638 Shopping Offers Java Medium Array, Dynamic_Programming, Bit_Manipulation, Backtracking, Bitmask, Memoization 6 71.06 0637 Average of Levels in Binary Tree Java Easy Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree 2 89.32 0636 Exclusive Time of Functions Java Medium Array, Stack 17 76.73 0633 Sum of Square Numbers Java Medium Math, Binary_Search, Two_Pointers, Binary_Search_I_Day_10 4 82.92 0632 Smallest Range Covering Elements from K Lists Java Hard Array, Hash_Table, Sorting, Greedy, Heap_Priority_Queue, Sliding_Window 31 87.39 0630 Course Schedule III Java Hard Array, Greedy, Heap_Priority_Queue 53 58.83 0629 K Inverse Pairs Array Java Hard Dynamic_Programming 19 94.44 0628 Maximum Product of Three Numbers Java Easy Array, Math, Sorting 2 99.90 0627 Swap Salary Sql Easy Database, SQL_I_Day_2_Select_&_Order 191 96.89 0626 Exchange Seats Sql Medium Database 274 65.75 0623 Add One Row to Tree Java Medium Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree 0 100.00 0622 Design Circular Queue Java Medium Array, Design, Linked_List, Queue, Programming_Skills_II_Day_20 3 100.00 0621 Task Scheduler Java Medium Array, Hash_Table, Sorting, Greedy, Heap_Priority_Queue, Counting 3 84.32 0620 Not Boring Movies Sql Easy Database 258 28.33 0617 Merge Two Binary Trees Java Easy Top_100_Liked_Questions, 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 Java Medium Array, Sorting, Greedy, Binary_Search, Two_Pointers, Binary_Search_II_Day_1 10 100.00 0609 Find Duplicate File in System Java Medium Array, String, Hash_Table 20 97.68 0608 Tree Node Sql Medium Database, SQL_I_Day_4_Union_&_Select 347 95.17 0606 Construct String from Binary Tree Java Easy String, Depth_First_Search, Tree, Binary_Tree 1 100.00 0605 Can Place Flowers Java Easy Array, Greedy 1 96.77 0601 Human Traffic of Stadium Sql Hard Database 328 62.41 0600 Non-negative Integers without Consecutive Ones Java Hard Dynamic_Programming 2 74.62 0599 Minimum Index Sum of Two Lists Java Easy Array, String, Hash_Table 7 93.97 0598 Range Addition II Java Easy Array, Math 0 100.00 0596 Classes More Than 5 Students Sql Easy Database 243 92.65 0595 Big Countries Sql Easy Database, SQL_I_Day_1_Select 241 92.61 0594 Longest Harmonious Subsequence Java Easy Array, Hash_Table, Sorting 11 99.77 0593 Valid Square Java Medium Math, Geometry 1 97.14 0592 Fraction Addition and Subtraction Java Medium String, Math, Simulation 4 98.58 0591 Tag Validator Java Hard String, Stack 3 70.89 0590 N-ary Tree Postorder Traversal Java Easy Depth_First_Search, Tree, Stack 0 100.00 0589 N-ary Tree Preorder Traversal Java Easy Depth_First_Search, Tree, Stack, Programming_Skills_I_Day_5_Function 2 54.35 0587 Erect the Fence Java Hard Array, Math, Geometry 10 87.50 0584 Find Customer Referee Sql Easy Database, SQL_I_Day_1_Select 505 43.87 0583 Delete Operation for Two Strings Java Medium String, Dynamic_Programming, Algorithm_II_Day_17_Dynamic_Programming 12 73.04 0581 Shortest Unsorted Continuous Subarray Java Medium Array, Sorting, Greedy, Two_Pointers, Stack, Monotonic_Stack 1 98.19 0576 Out of Boundary Paths Java Medium Dynamic_Programming 7 74.13 0575 Distribute Candies Java Easy Array, Hash_Table 64 40.90 0572 Subtree of Another Tree Java 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 Java Medium String, Hash_Table, Two_Pointers, Sliding_Window, Algorithm_I_Day_6_Sliding_Window 4 95.23 0566 Reshape the Matrix Java Easy Array, Matrix, Simulation, Data_Structure_I_Day_4_Array, Programming_Skills_I_Day_7_Array 1 84.34 0565 Array Nesting Java Medium Array, Depth_First_Search 4 98.54 0564 Find the Closest Palindrome Java Hard String, Math 1 100.00 0563 Binary Tree Tilt Java Easy Depth_First_Search, Tree, Binary_Tree 0 100.00 0561 Array Partition I Java Easy Array, Sorting, Greedy, Counting_Sort 18 31.77 0560 Subarray Sum Equals K Java 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 Java Easy Depth_First_Search, Breadth_First_Search, Tree 1 78.18 0558 Logical OR of Two Binary Grids Represented as Quad-Trees Java Medium Tree, Divide_and_Conquer 0 100.00 0557 Reverse Words in a String III Java Easy String, Two_Pointers, Algorithm_I_Day_4_Two_Pointers 5 88.09 0556 Next Greater Element III Java Medium String, Math, Two_Pointers, Programming_Skills_II_Day_10 0 100.00 0554 Brick Wall Java Medium Array, Hash_Table 13 75.64 0553 Optimal Division Java Medium Array, Dynamic_Programming, Math 1 96.63 0552 Student Attendance Record II Java Hard Dynamic_Programming 8 99.21 0551 Student Attendance Record I Java Easy String 1 68.22 0547 Number of Provinces Java 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 Java Hard Array, Dynamic_Programming, Memoization 86 60.93 0543 Diameter of Binary Tree Java Easy Top_100_Liked_Questions, Depth_First_Search, Tree, Binary_Tree 1 55.16 0542 01 Matrix Java 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 Java Easy String, Two_Pointers 1 93.18 0540 Single Element in a Sorted Array Java Medium Array, Binary_Search, Binary_Search_II_Day_9 0 100.00 0539 Minimum Time Difference Java Medium Array, String, Math, Sorting 3 93.52 0538 Convert BST to Greater Tree Java Medium Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree 1 83.78 0537 Complex Number Multiplication Java Medium String, Math, Simulation 7 62.22 0535 Encode and Decode TinyURL Java Medium String, Hash_Table, Design, Hash_Function 3 82.89 0532 K-diff Pairs in an Array Java Medium Array, Hash_Table, Sorting, Binary_Search, Two_Pointers 14 49.69 0530 Minimum Absolute Difference in BST Java Easy Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Binary_Search_Tree 0 100.00 0529 Minesweeper Java Medium Array, Depth_First_Search, Breadth_First_Search, Matrix 0 100.00 0528 Random Pick with Weight Java Medium Math, Binary_Search, Prefix_Sum, Randomized, Binary_Search_II_Day_13 29 83.26 0526 Beautiful Arrangement Java Medium Array, Dynamic_Programming, Bit_Manipulation, Backtracking, Bitmask 3 98.99 0525 Contiguous Array Java Medium Array, Hash_Table, Prefix_Sum 17 92.02 0524 Longest Word in Dictionary through Deleting Java Medium Array, String, Sorting, Two_Pointers 10 97.43 0523 Continuous Subarray Sum Java Medium Array, Hash_Table, Math, Prefix_Sum 25 78.40 0522 Longest Uncommon Subsequence II Java Medium Array, String, Hash_Table, Sorting, Two_Pointers 1 100.00 0521 Longest Uncommon Subsequence I Java Easy String 0 100.00 0520 Detect Capital Java Easy String 2 72.44 0519 Random Flip Matrix Java Medium Hash_Table, Math, Randomized, Reservoir_Sampling 39 68.47 0518 Coin Change 2 Java Medium Array, Dynamic_Programming, Dynamic_Programming_I_Day_20 3 91.32 0517 Super Washing Machines Java Hard Array, Greedy 0 100.00 0516 Longest Palindromic Subsequence Java Medium String, Dynamic_Programming, Dynamic_Programming_I_Day_17 31 96.10 0515 Find Largest Value in Each Tree Row Java Medium Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree 1 96.84 0514 Freedom Trail Java Hard String, Dynamic_Programming, Depth_First_Search, Breadth_First_Search 17 75.84 0513 Find Bottom Left Tree Value Java Medium Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree 1 80.06 0509 Fibonacci Number Java Easy Dynamic_Programming, Math, Recursion, Memoization, Dynamic_Programming_I_Day_1 0 100.00 0508 Most Frequent Subtree Sum Java Medium Hash_Table, Depth_First_Search, Tree, Binary_Tree 6 77.55 0507 Perfect Number Java Easy Math 2 73.73 0506 Relative Ranks Java Easy Array, Sorting, Heap_Priority_Queue 4 99.79 0504 Base 7 Java Easy Math 1 94.93 0503 Next Greater Element II Java Medium Array, Stack, Monotonic_Stack, Programming_Skills_II_Day_10 7 95.85 0502 IPO Java Hard Array, Sorting, Greedy, Heap_Priority_Queue 43 92.06 0501 Find Mode in Binary Search Tree Java Easy Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree 1 91.60 0500 Keyboard Row Java Easy Array, String, Hash_Table 0 100.00 0498 Diagonal Traverse Java Medium Array, Matrix, Simulation 2 96.07 0497 Random Point in Non-overlapping Rectangles Java Medium Math, Binary_Search, Prefix_Sum, Ordered_Set, Randomized, Reservoir_Sampling 44 97.50 0496 Next Greater Element I Java Easy Array, Hash_Table, Stack, Monotonic_Stack, Programming_Skills_I_Day_5_Function 3 84.97 0495 Teemo Attacking Java Easy Array, Simulation 4 26.85 0494 Target Sum Java Medium Top_100_Liked_Questions, Array, Dynamic_Programming, Backtracking 10 82.41 0493 Reverse Pairs Java Hard Array, Binary_Search, Ordered_Set, Divide_and_Conquer, Segment_Tree, Binary_Indexed_Tree, Merge_Sort 121 31.13 0492 Construct the Rectangle Java Easy Math 1 74.25 0491 Increasing Subsequences Java Medium Array, Hash_Table, Bit_Manipulation, Backtracking 22 46.38 0488 Zuma Game Java Hard String, Dynamic_Programming, Breadth_First_Search, Memoization 2077 7.41 0486 Predict the Winner Java Medium Array, Dynamic_Programming, Math, Recursion, Game_Theory 0 100.00 0485 Max Consecutive Ones Java Easy Array 1 100.00 0483 Smallest Good Base Java Hard Math, Binary_Search 3 87.88 0482 License Key Formatting Java Easy String 7 98.60 0481 Magical String Java Medium String, Two_Pointers 5 88.46 0480 Sliding Window Median Java Hard Array, Hash_Table, Heap_Priority_Queue, Sliding_Window 46 80.65 0479 Largest Palindrome Product Java Hard Math 6 97.54 0478 Generate Random Point in a Circle Java Medium Math, Geometry, Randomized, Rejection_Sampling 196 98.10 0477 Total Hamming Distance Java Medium Array, Math, Bit_Manipulation 5 90.97 0476 Number Complement Java Easy Bit_Manipulation 0 100.00 0475 Heaters Java Medium Array, Sorting, Binary_Search, Two_Pointers 8 99.30 0474 Ones and Zeroes Java Medium Array, String, Dynamic_Programming 41 68.79 0473 Matchsticks to Square Java Medium Array, Dynamic_Programming, Bit_Manipulation, Backtracking, Bitmask 241 18.95 0472 Concatenated Words Java Hard Array, String, Dynamic_Programming, Depth_First_Search, Trie 84 79.03 0470 Implement Rand10() Using Rand7() Java Medium Math, Randomized, Probability_and_Statistics, Rejection_Sampling 10 51.04 0468 Validate IP Address Java Medium String 1 98.15 0467 Unique Substrings in Wraparound String Java Medium String, Dynamic_Programming 5 88.61 0466 Count The Repetitions Java Hard String, Dynamic_Programming 1 100.00 0464 Can I Win Java Medium Dynamic_Programming, Math, Bit_Manipulation, Bitmask, Memoization, Game_Theory 159 84.80 0463 Island Perimeter Java Easy Array, Depth_First_Search, Breadth_First_Search, Matrix 9 74.15 0462 Minimum Moves to Equal Array Elements II Java Medium Array, Math, Sorting 3 94.38 0461 Hamming Distance Java Easy Bit_Manipulation 1 39.19 0460 LFU Cache Java Hard Hash_Table, Design, Linked_List, Doubly_Linked_List 45 99.66 0459 Repeated Substring Pattern Java Easy String, String_Matching, Programming_Skills_II_Day_2 9 90.15 0458 Poor Pigs Java Hard Dynamic_Programming, Math, Combinatorics 0 100.00 0457 Circular Array Loop Java Medium Array, Hash_Table, Two_Pointers 2 73.72 0456 132 Pattern Java Medium Array, Binary_Search, Stack, Ordered_Set, Monotonic_Stack 15 80.22 0455 Assign Cookies Java Easy Array, Sorting, Greedy 11 42.95 0454 4Sum II Java Medium Top_Interview_Questions, Array, Hash_Table 157 74.79 0453 Minimum Moves to Equal Array Elements Java Medium Array, Math 1 100.00 0452 Minimum Number of Arrows to Burst Balloons Java Medium Array, Sorting, Greedy 80 76.91 0451 Sort Characters By Frequency Java 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 Java Medium Tree, Binary_Tree, Binary_Search_Tree, Data_Structure_II_Day_16_Tree 0 100.00 0448 Find All Numbers Disappeared in an Array Java Easy Array, Hash_Table 3 100.00 0443 String Compression Java Medium String, Two_Pointers 2 60.36 0442 Find All Duplicates in an Array Java Medium Array, Hash_Table 5 94.88 0441 Arranging Coins Java Easy Math, Binary_Search, Binary_Search_I_Day_6 2 87.99 0440 K-th Smallest in Lexicographical Order Java Hard Trie 0 100.00 0438 Find All Anagrams in a String Java Medium Top_100_Liked_Questions, String, Hash_Table, Sliding_Window, Algorithm_II_Day_5_Sliding_Window, Programming_Skills_II_Day_12 8 87.18 0437 Path Sum III Java Medium Top_100_Liked_Questions, Depth_First_Search, Tree, Binary_Tree 4 87.75 0436 Find Right Interval Java Medium Array, Sorting, Binary_Search, Binary_Search_II_Day_11 17 87.90 0435 Non-overlapping Intervals Java Medium Array, Dynamic_Programming, Sorting, Greedy, Data_Structure_II_Day_4_Array 109 26.80 0434 Number of Segments in a String Java Easy String 0 100.00 0433 Minimum Genetic Mutation Java Medium String, Hash_Table, Breadth_First_Search, Graph_Theory_I_Day_12_Breadth_First_Search 0 100.00 0432 All O`one Data Structure Java Hard Hash_Table, Design, Linked_List, Doubly_Linked_List 87 62.81 0430 Flatten a Multilevel Doubly Linked List Java Medium Depth_First_Search, Linked_List, Doubly_Linked_List 0 100.00 0429 N-ary Tree Level Order Traversal Java Medium Breadth_First_Search, Tree, Programming_Skills_II_Day_9 4 57.07 0427 Construct Quad Tree Java Medium Array, Tree, Matrix, Divide_and_Conquer 1 85.16 0424 Longest Repeating Character Replacement Java Medium String, Hash_Table, Sliding_Window 5 92.61 0423 Reconstruct Original Digits from English Java Medium String, Hash_Table, Math 3 100.00 0421 Maximum XOR of Two Numbers in an Array Java Medium Array, Hash_Table, Bit_Manipulation, Trie 22 99.22 0420 Strong Password Checker Java Hard String, Greedy, Heap_Priority_Queue 0 100.00 0419 Battleships in a Board Java Medium Array, Depth_First_Search, Matrix 1 83.10 0417 Pacific Atlantic Water Flow Java 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 Java Medium Top_100_Liked_Questions, Array, Dynamic_Programming 1 99.87 0415 Add Strings Java Easy String, Math, Simulation, Data_Structure_II_Day_6_String 3 75.64 0414 Third Maximum Number Java Easy Array, Sorting 1 96.71 0413 Arithmetic Slices Java Medium Array, Dynamic_Programming, Algorithm_II_Day_14_Dynamic_Programming, Dynamic_Programming_I_Day_10 0 100.00 0412 Fizz Buzz Java Easy Top_Interview_Questions, String, Math, Simulation 3 32.80 0410 Split Array Largest Sum Java Hard Array, Dynamic_Programming, Greedy, Binary_Search 1 84.88 0409 Longest Palindrome Java Easy String, Hash_Table, Greedy, Data_Structure_II_Day_6_String 1 100.00 0407 Trapping Rain Water II Java Hard Array, Breadth_First_Search, Matrix, Heap_Priority_Queue 10 99.01 0406 Queue Reconstruction by Height Java Medium Array, Sorting, Greedy, Segment_Tree, Binary_Indexed_Tree 9 74.45 0405 Convert a Number to Hexadecimal Java Easy Math, Bit_Manipulation 0 100.00 0404 Sum of Left Leaves Java Easy Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Programming_Skills_I_Day_10_Linked_List_&_Tree 0 100.00 0403 Frog Jump Java Hard Array, Dynamic_Programming 18 97.19 0402 Remove K Digits Java Medium String, Greedy, Stack, Monotonic_Stack 6 90.82 0401 Binary Watch Java Easy Bit_Manipulation, Backtracking 1 98.21 0400 Nth Digit Java Medium Math, Binary_Search 0 100.00 0399 Evaluate Division Java Medium Array, Depth_First_Search, Breadth_First_Search, Graph, Union_Find, Shortest_Path 1 97.67 0398 Random Pick Index Java Medium Hash_Table, Math, Randomized, Reservoir_Sampling 75 74.64 0397 Integer Replacement Java Medium Dynamic_Programming, Greedy, Bit_Manipulation, Memoization 0 100.00 0396 Rotate Function Java Medium Array, Dynamic_Programming, Math 3 98.51 0395 Longest Substring with At Least K Repeating Characters Java Medium Top_Interview_Questions, String, Hash_Table, Sliding_Window, Divide_and_Conquer 0 100.00 0394 Decode String Java Medium Top_100_Liked_Questions, String, Stack, Recursion 1 83.81 0393 UTF-8 Validation Java Medium Array, Bit_Manipulation 1 100.00 0392 Is Subsequence Java Easy String, Dynamic_Programming, Two_Pointers, Dynamic_Programming_I_Day_19 0 100.00 0391 Perfect Rectangle Java Hard Array, Line_Sweep 49 67.32 0390 Elimination Game Java Medium Math 2 100.00 0389 Find the Difference Java Easy String, Hash_Table, Sorting, Bit_Manipulation, Programming_Skills_I_Day_8_String 1 99.83 0388 Longest Absolute File Path Java Medium String, Depth_First_Search, Stack 2 52.22 0387 First Unique Character in a String Java Easy Top_Interview_Questions, String, Hash_Table, Counting, Queue, Data_Structure_I_Day_6_String 2 99.53 0386 Lexicographical Numbers Java Medium Depth_First_Search, Trie 4 87.17 0385 Mini Parser Java Medium String, Depth_First_Search, Stack 3 97.44 0384 Shuffle an Array Java Medium Top_Interview_Questions, Array, Math, Randomized, Algorithm_II_Day_20_Others 65 94.59 0383 Ransom Note Java Easy String, Hash_Table, Counting, Data_Structure_I_Day_6_String 1 99.79 0382 Linked List Random Node Java Medium Math, Linked_List, Randomized, Reservoir_Sampling 7 100.00 0381 Insert Delete GetRandom O(1) - Duplicates allowed Java Hard Array, Hash_Table, Math, Design, Randomized 26 100.00 0380 Insert Delete GetRandom O(1) Java 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 Java Medium Top_Interview_Questions, Array, Sorting, Binary_Search, Matrix, Heap_Priority_Queue 0 100.00 0377 Combination Sum IV Java Medium Array, Dynamic_Programming, Dynamic_Programming_I_Day_21 1 91.72 0376 Wiggle Subsequence Java Medium Array, Dynamic_Programming, Greedy, Dynamic_Programming_I_Day_18 0 100.00 0375 Guess Number Higher or Lower II Java Medium Dynamic_Programming, Math, Game_Theory 1 100.00 0374 Guess Number Higher or Lower Java Easy Binary_Search, Interactive, Binary_Search_I_Day_1 0 100.00 0373 Find K Pairs with Smallest Sums Java Medium Array, Heap_Priority_Queue 58 29.29 0372 Super Pow Java Medium Math, Divide_and_Conquer 2 91.10 0371 Sum of Two Integers Java Medium Top_Interview_Questions, Math, Bit_Manipulation 0 100.00 0368 Largest Divisible Subset Java Medium Array, Dynamic_Programming, Math, Sorting 20 87.61 0367 Valid Perfect Square Java Easy Math, Binary_Search, Binary_Search_I_Day_3 0 100.00 0365 Water and Jug Problem Java 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 Java Hard Array, Dynamic_Programming, Binary_Search, Matrix, Ordered_Set 69 97.33 0357 Count Numbers with Unique Digits Java Medium Dynamic_Programming, Math, Backtracking 0 100.00 0355 Design Twitter Java Medium Hash_Table, Design, Heap_Priority_Queue, Linked_List 8 99.79 0354 Russian Doll Envelopes Java Hard Array, Dynamic_Programming, Sorting, Binary_Search 65 67.49 0352 Data Stream as Disjoint Intervals Java Hard Binary_Search, Design, Ordered_Set 94 76.26 0350 Intersection of Two Arrays II Java 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 Java Easy Array, Hash_Table, Sorting, Binary_Search, Two_Pointers 1 99.75 0347 Top K Frequent Elements Java 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 Java Easy String, Two_Pointers 4 86.90 0344 Reverse String Java Easy Top_Interview_Questions, String, Two_Pointers, Recursion, Algorithm_I_Day_4_Two_Pointers 1 87.94 0343 Integer Break Java Medium Dynamic_Programming, Math, Algorithm_II_Day_18_Dynamic_Programming, Dynamic_Programming_I_Day_21 0 100.00 0342 Power of Four Java Easy Math, Bit_Manipulation, Recursion 1 91.73 0341 Flatten Nested List Iterator Java Medium Top_Interview_Questions, Depth_First_Search, Tree, Stack, Design, Queue, Iterator, Programming_Skills_II_Day_18 3 86.51 0338 Counting Bits Java Easy Top_100_Liked_Questions, Dynamic_Programming, Bit_Manipulation 1 99.97 0337 House Robber III Java Medium Dynamic_Programming, Depth_First_Search, Tree, Binary_Tree 1 87.96 0336 Palindrome Pairs Java Hard Array, String, Hash_Table, Trie 1219 54.97 0335 Self Crossing Java Hard Array, Math, Geometry 6 44.12 0334 Increasing Triplet Subsequence Java Medium Top_Interview_Questions, Array, Greedy, Data_Structure_II_Day_5_Array 3 61.85 0332 Reconstruct Itinerary Java Hard Depth_First_Search, Graph, Eulerian_Circuit 11 47.68 0331 Verify Preorder Serialization of a Binary Tree Java Medium String, Tree, Binary_Tree, Stack 3 94.01 0330 Patching Array Java Hard Array, Greedy 0 100.00 0329 Longest Increasing Path in a Matrix Java Hard Top_Interview_Questions, Dynamic_Programming, Depth_First_Search, Breadth_First_Search, Graph, Memoization, Topological_Sort 8 91.02 0328 Odd Even Linked List Java Medium Top_Interview_Questions, Linked_List 0 100.00 0327 Count of Range Sum Java Hard Array, Binary_Search, Ordered_Set, Divide_and_Conquer, Segment_Tree, Binary_Indexed_Tree, Merge_Sort 64 87.41 0326 Power of Three Java Easy Top_Interview_Questions, Math, Recursion 18 79.91 0324 Wiggle Sort II Java Medium Top_Interview_Questions, Array, Sorting, Divide_and_Conquer, Quickselect 6 69.23 0322 Coin Change Java 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 Java Hard Greedy, Stack, Monotonic_Stack 9 93.46 0319 Bulb Switcher Java Medium Math, Brainteaser 0 100.00 0318 Maximum Product of Word Lengths Java Medium Array, String, Bit_Manipulation 10 81.97 0316 Remove Duplicate Letters Java Medium String, Greedy, Stack, Monotonic_Stack 2 98.39 0315 Count of Smaller Numbers After Self Java 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 Java Medium Array, Hash_Table, Dynamic_Programming, Math, Heap_Priority_Queue 280 86.61 0312 Burst Balloons Java Hard Array, Dynamic_Programming 53 86.06 0310 Minimum Height Trees Java Medium Depth_First_Search, Breadth_First_Search, Graph, Topological_Sort 22 94.43 0309 Best Time to Buy and Sell Stock with Cooldown Java Medium Array, Dynamic_Programming, Dynamic_Programming_I_Day_8 0 100.00 0307 Range Sum Query - Mutable Java Medium Array, Design, Segment_Tree, Binary_Indexed_Tree 61 98.40 0306 Additive Number Java Medium String, Backtracking 1 87.31 0304 Range Sum Query 2D - Immutable Java Medium Array, Matrix, Design, Prefix_Sum, Dynamic_Programming_I_Day_14, Programming_Skills_II_Day_13 103 98.60 0303 Range Sum Query - Immutable Java Easy Array, Design, Prefix_Sum, Programming_Skills_I_Day_12_Class_&_Object 6 100.00 0301 Remove Invalid Parentheses Java Hard String, Breadth_First_Search, Backtracking 4 86.17 0300 Longest Increasing Subsequence Java 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 Java Medium String, Hash_Table, Counting 8 67.24 0297 Serialize and Deserialize Binary Tree Java Hard Top_100_Liked_Questions, 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 Java Hard Top_100_Liked_Questions, Top_Interview_Questions, Sorting, Two_Pointers, Design, Heap_Priority_Queue, Data_Stream 88 98.03 0292 Nim Game Java Easy Math, Game_Theory, Brainteaser 0 100.00 0290 Word Pattern Java Easy String, Hash_Table, Data_Structure_II_Day_7_String 1 91.62 0289 Game of Life Java Medium Top_Interview_Questions, Array, Matrix, Simulation 0 100.00 0287 Find the Duplicate Number Java 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 Java Medium Array, Design, Iterator 5 78.72 0283 Move Zeroes Java 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 Java Hard String, Math, Backtracking 7 99.73 0279 Perfect Squares Java Medium Top_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Math, Breadth_First_Search, Dynamic_Programming_I_Day_21 0 100.00 0278 First Bad Version Java Easy Binary_Search, Interactive, Algorithm_I_Day_1_Binary_Search, Binary_Search_I_Day_5 12 99.50 0275 H-Index II Java Medium Array, Binary_Search, Binary_Search_II_Day_8 0 100.00 0274 H-Index Java Medium Array, Sorting, Counting_Sort 2 51.85 0273 Integer to English Words Java Hard String, Math, Recursion 5 83.37 0268 Missing Number Java Easy Top_Interview_Questions, Array, Hash_Table, Math, Sorting, Bit_Manipulation 0 100.00 0264 Ugly Number II Java Medium Hash_Table, Dynamic_Programming, Math, Heap_Priority_Queue, Dynamic_Programming_I_Day_11 3 88.43 0263 Ugly Number Java Easy Math 1 95.93 0262 Trips and Users Sql Hard Database 449 79.92 0260 Single Number III Java Medium Array, Bit_Manipulation 1 98.18 0258 Add Digits Java Easy Math, Simulation, Number_Theory 1 95.33 0257 Binary Tree Paths Java Easy String, Depth_First_Search, Tree, Binary_Tree, Backtracking 2 91.59 0242 Valid Anagram Java Easy Top_Interview_Questions, String, Hash_Table, Sorting, Data_Structure_I_Day_6_String, Programming_Skills_I_Day_11_Containers_&_Libraries 2 98.88 0241 Different Ways to Add Parentheses Java Medium String, Dynamic_Programming, Math, Recursion, Memoization 2 81.46 0240 Search a 2D Matrix II Java 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 Java 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 Java 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 Java Easy Top_Interview_Questions, Linked_List 0 100.00 0236 Lowest Common Ancestor of a Binary Tree Java 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 Java Easy Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree, Data_Structure_I_Day_14_Tree 7 52.79 0234 Palindrome Linked List Java Easy Top_100_Liked_Questions, Top_Interview_Questions, Two_Pointers, Stack, Linked_List, Recursion 5 89.76 0233 Number of Digit One Java Hard Dynamic_Programming, Math, Recursion 0 100.00 0232 Implement Queue using Stacks Java Easy Stack, Design, Queue, Data_Structure_I_Day_9_Stack_Queue, Programming_Skills_I_Day_11_Containers_&_Libraries 1 56.63 0231 Power of Two Java Easy Math, Bit_Manipulation, Recursion, Algorithm_I_Day_13_Bit_Manipulation 1 95.76 0230 Kth Smallest Element in a BST Java Medium 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 Java Medium Array, Hash_Table, Sorting, Counting 2 91.84 0228 Summary Ranges Java Easy Array 0 100.00 0227 Basic Calculator II Java Medium Top_Interview_Questions, String, Math, Stack 9 88.15 0226 Invert Binary Tree Java 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 Java Easy Stack, Design, Queue 0 100.00 0224 Basic Calculator Java Hard String, Math, Stack, Recursion 3 98.82 0223 Rectangle Area Java Medium Math, Geometry 2 99.58 0222 Count Complete Tree Nodes Java Medium Depth_First_Search, Tree, Binary_Search, Binary_Tree, Binary_Search_II_Day_10 0 100.00 0221 Maximal Square Java Medium Top_100_Liked_Questions, Array, Dynamic_Programming, Matrix, Dynamic_Programming_I_Day_16 6 80.89 0220 Contains Duplicate III Java Medium Array, Sorting, Sliding_Window, Ordered_Set, Bucket_Sort 46 62.24 0219 Contains Duplicate II Java Easy Array, Hash_Table, Sliding_Window 44 42.18 0218 The Skyline Problem Java 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 Java Easy Top_Interview_Questions, Array, Hash_Table, Sorting, Data_Structure_I_Day_1_Array, Programming_Skills_I_Day_11_Containers_&_Libraries 27 16.94 0216 Combination Sum III Java Medium Array, Backtracking 1 78.74 0215 Kth Largest Element in an Array Java 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 Java Hard String, Hash_Function, String_Matching, Rolling_Hash 3 94.71 0213 House Robber II Java Medium Array, Dynamic_Programming, Algorithm_II_Day_12_Dynamic_Programming, Dynamic_Programming_I_Day_3 1 31.05 0212 Word Search II Java Hard Top_Interview_Questions, Array, String, Matrix, Backtracking, Trie 20 96.11 0211 Design Add and Search Words Data Structure Java Medium String, Depth_First_Search, Design, Trie 403 18.89 0210 Course Schedule II Java Medium Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Breadth_First_Search, Graph, Topological_Sort 7 74.90 0209 Minimum Size Subarray Sum Java 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) Java Medium Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Design, Trie 63 55.40 0207 Course Schedule Java Medium Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Breadth_First_Search, Graph, Topological_Sort 2 99.76 0206 Reverse Linked List Java Easy Top_100_Liked_Questions, Top_Interview_Questions, Linked_List, Recursion, Data_Structure_I_Day_8_Linked_List, Algorithm_I_Day_10_Recursion_Backtracking 0 100.00 0205 Isomorphic Strings Java Easy String, Hash_Table 1 100.00 0204 Count Primes Java Medium Top_Interview_Questions, Array, Math, Enumeration, Number_Theory 146 72.74 0203 Remove Linked List Elements Java Easy Linked_List, Recursion, Data_Structure_I_Day_7_Linked_List 1 90.35 0202 Happy Number Java 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 Java Medium Bit_Manipulation, Algorithm_II_Day_19_Bit_Manipulation 10 40.99 0200 Number of Islands Java 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 4 73.02 0199 Binary Tree Right Side View Java Medium Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Data_Structure_II_Day_16_Tree 1 92.96 0198 House Robber Java 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 Sql Easy Database, SQL_I_Day_6_Union 401 79.45 0196 Delete Duplicate Emails Sql Easy Database, SQL_I_Day_2_Select_&_Order 541 81.09 0195 Tenth Line Shell Easy Shell 4 93.33 0194 Transpose File Shell Medium Shell 0 100.00 0193 Valid Phone Numbers Shell Easy Shell 129 42.86 0192 Word Frequency Shell Medium Shell 152 38.56 0191 Number of 1 Bits Java Easy Top_Interview_Questions, Bit_Manipulation, Algorithm_I_Day_13_Bit_Manipulation, Programming_Skills_I_Day_2_Operator 0 100.00 0190 Reverse Bits Java Easy Top_Interview_Questions, Bit_Manipulation, Divide_and_Conquer, Algorithm_I_Day_14_Bit_Manipulation 1 89.07 0189 Rotate Array Java Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Math, Two_Pointers, Algorithm_I_Day_2_Two_Pointers 1 83.21 0188 Best Time to Buy and Sell Stock IV Java Hard Array, Dynamic_Programming 2 92.32 0187 Repeated DNA Sequences Java Medium String, Hash_Table, Bit_Manipulation, Sliding_Window, Hash_Function, Rolling_Hash, Data_Structure_II_Day_9_String 32 67.58 0185 Department Top Three Salaries Sql Hard Database 763 63.69 0184 Department Highest Salary Sql Medium Database 576 64.14 0183 Customers Who Never Order Sql Easy Database, SQL_I_Day_1_Select 581 23.03 0182 Duplicate Emails Sql Easy Database, SQL_I_Day_10_Where 345 59.47 0181 Employees Earning More Than Their Managers Sql Easy Database 385 52.30 0180 Consecutive Numbers Sql Medium Database 636 19.31 0179 Largest Number Java Medium Top_Interview_Questions, String, Sorting, Greedy 11 45.93 0178 Rank Scores Sql Medium Database 299 52.08 0177 Nth Highest Salary Sql Medium Database 328 65.32 0176 Second Highest Salary Sql Medium Database, SQL_I_Day_4_Union_&_Select 203 63.47 0175 Combine Two Tables Sql Easy Database, SQL_I_Day_5_Union 449 30.35 0174 Dungeon Game Java Hard Array, Dynamic_Programming, Matrix 1 96.60 0173 Binary Search Tree Iterator Java Medium Tree, Binary_Tree, Stack, Design, Binary_Search_Tree, Iterator, Data_Structure_II_Day_17_Tree, Programming_Skills_II_Day_16 18 78.45 0172 Factorial Trailing Zeroes Java Medium Top_Interview_Questions, Math 1 81.96 0171 Excel Sheet Column Number Java Easy Top_Interview_Questions, String, Math 3 24.67 0169 Majority Element Java Easy Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Sorting, Counting, Divide_and_Conquer, Data_Structure_II_Day_1_Array 2 83.81 0168 Excel Sheet Column Title Java Easy String, Math 0 100.00 0167 Two Sum II - Input Array Is Sorted Java Medium Array, Binary_Search, Two_Pointers, Algorithm_I_Day_3_Two_Pointers, Binary_Search_I_Day_7 2 49.88 0166 Fraction to Recurring Decimal Java Medium Top_Interview_Questions, String, Hash_Table, Math 4 33.10 0165 Compare Version Numbers Java Medium String, Two_Pointers 1 90.80 0164 Maximum Gap Java Hard Array, Sorting, Bucket_Sort, Radix_Sort 36 66.54 0162 Find Peak Element Java 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 Java Easy Top_100_Liked_Questions, Top_Interview_Questions, Hash_Table, Two_Pointers, Linked_List, Data_Structure_II_Day_11_Linked_List 2 61.05 0155 Min Stack Java Easy Top_100_Liked_Questions, Top_Interview_Questions, Stack, Design, Data_Structure_II_Day_14_Stack_Queue, Programming_Skills_II_Day_18 5 81.77 0154 Find Minimum in Rotated Sorted Array II Java Hard Array, Binary_Search, Binary_Search_II_Day_13 0 100.00 0153 Find Minimum in Rotated Sorted Array Java 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 Java 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 Java Medium String, Two_Pointers 3 96.37 0150 Evaluate Reverse Polish Notation Java Medium Top_Interview_Questions, Array, Math, Stack, Programming_Skills_II_Day_3 12 29.56 0149 Max Points on a Line Java Hard Top_Interview_Questions, Array, Hash_Table, Math, Geometry, Algorithm_II_Day_21_Others 4 98.44 0148 Sort List Java Medium Top_100_Liked_Questions, Top_Interview_Questions, Sorting, Two_Pointers, Linked_List, Divide_and_Conquer, Merge_Sort 8 78.95 0147 Insertion Sort List Java Medium Sorting, Linked_List 3 92.25 0146 LRU Cache Java Medium Top_100_Liked_Questions, Top_Interview_Questions, Hash_Table, Design, Linked_List, Doubly_Linked_List 82 59.12 0145 Binary Tree Postorder Traversal Java Easy Depth_First_Search, Tree, Binary_Tree, Stack, Data_Structure_I_Day_10_Tree 1 42.74 0144 Binary Tree Preorder Traversal Java Easy Depth_First_Search, Tree, Binary_Tree, Stack, Data_Structure_I_Day_10_Tree 1 42.23 0143 Reorder List Java Medium Two_Pointers, Stack, Linked_List, Recursion, Data_Structure_II_Day_13_Linked_List, Programming_Skills_II_Day_14 2 72.16 0142 Linked List Cycle II Java Medium Top_100_Liked_Questions, Hash_Table, Two_Pointers, Linked_List, Data_Structure_II_Day_10_Linked_List 0 100.00 0141 Linked List Cycle Java 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 Java Hard Top_Interview_Questions, String, Hash_Table, Dynamic_Programming, Backtracking, Trie, Memoization 1 95.98 0139 Word Break Java 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 96.55 0138 Copy List with Random Pointer Java Medium Top_100_Liked_Questions, Top_Interview_Questions, Hash_Table, Linked_List, Programming_Skills_II_Day_14 0 100.00 0137 Single Number II Java Medium Array, Bit_Manipulation 1 91.46 0136 Single Number Java Easy Top_100_Liked_Questions, Top_Interview_Questions, Array, Bit_Manipulation, Data_Structure_II_Day_1_Array, Algorithm_I_Day_14_Bit_Manipulation 2 58.97 0135 Candy Java Hard Array, Greedy 3 76.49 0134 Gas Station Java Medium Top_Interview_Questions, Array, Greedy 3 61.54 0133 Clone Graph Java Medium Hash_Table, Depth_First_Search, Breadth_First_Search, Graph 55 16.92 0132 Palindrome Partitioning II Java Hard String, Dynamic_Programming 2 99.72 0131 Palindrome Partitioning Java Medium Top_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming, Backtracking 19 53.74 0130 Surrounded Regions Java 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 80.58 0129 Sum Root to Leaf Numbers Java Medium Depth_First_Search, Tree, Binary_Tree 0 100.00 0128 Longest Consecutive Sequence Java Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Union_Find 17 84.46 0127 Word Ladder Java Hard Top_Interview_Questions, String, Hash_Table, Breadth_First_Search, Graph_Theory_I_Day_12_Breadth_First_Search 32 94.39 0126 Word Ladder II Java Hard String, Hash_Table, Breadth_First_Search, Backtracking 4 99.18 0125 Valid Palindrome Java Easy Top_Interview_Questions, String, Two_Pointers 3 88.82 0124 Binary Tree Maximum Path Sum Java Hard Top_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Depth_First_Search, Tree, Binary_Tree 1 76.01 0123 Best Time to Buy and Sell Stock III Java Hard Array, Dynamic_Programming 1 100.00 0122 Best Time to Buy and Sell Stock II Java Medium Top_Interview_Questions, Array, Dynamic_Programming, Greedy, Dynamic_Programming_I_Day_7 2 34.31 0121 Best Time to Buy and Sell Stock Java Easy Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Data_Structure_I_Day_3_Array, Dynamic_Programming_I_Day_7 2 85.25 0120 Triangle Java Medium Array, Dynamic_Programming, Algorithm_I_Day_12_Dynamic_Programming, Dynamic_Programming_I_Day_13 1 99.76 0119 Pascal's Triangle II Java Easy Array, Dynamic_Programming, Data_Structure_II_Day_3_Array, Dynamic_Programming_I_Day_12 0 100.00 0118 Pascal's Triangle Java Easy Top_Interview_Questions, Array, Dynamic_Programming, Data_Structure_I_Day_4_Array, Dynamic_Programming_I_Day_12 1 62.34 0117 Populating Next Right Pointers in Each Node II Java 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 Java 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 Java Hard String, Dynamic_Programming 3 99.53 0114 Flatten Binary Tree to Linked List Java Medium Top_100_Liked_Questions, Depth_First_Search, Tree, Binary_Tree, Stack, Linked_List 1 69.36 0113 Path Sum II Java Medium Depth_First_Search, Tree, Binary_Tree, Backtracking, Data_Structure_II_Day_16_Tree 1 100.00 0112 Path Sum Java 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 Java Easy Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree 1 94.17 0110 Balanced Binary Tree Java Easy Depth_First_Search, Tree, Binary_Tree, Programming_Skills_II_Day_2 0 100.00 0109 Convert Sorted List to Binary Search Tree Java Medium Tree, Binary_Tree, Linked_List, Binary_Search_Tree, Divide_and_Conquer 1 80.17 0108 Convert Sorted Array to Binary Search Tree Java 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 Java Medium Breadth_First_Search, Tree, Binary_Tree 1 93.94 0106 Construct Binary Tree from Inorder and Postorder Traversal Java Medium Array, Hash_Table, Tree, Binary_Tree, Divide_and_Conquer 1 99.20 0105 Construct Binary Tree from Preorder and Inorder Traversal Java Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Tree, Binary_Tree, Divide_and_Conquer, Data_Structure_II_Day_15_Tree 1 99.69 0104 Maximum Depth of Binary Tree Java 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_&_Tree 0 100.00 0103 Binary Tree Zigzag Level Order Traversal Java Medium Top_Interview_Questions, Breadth_First_Search, Tree, Binary_Tree, Data_Structure_II_Day_15_Tree 1 86.98 0102 Binary Tree Level Order Traversal Java Medium Top_100_Liked_Questions, Top_Interview_Questions, Breadth_First_Search, Tree, Binary_Tree, Data_Structure_I_Day_11_Tree 0 100.00 0101 Symmetric Tree Java 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 Java Easy Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree 0 100.00 0099 Recover Binary Search Tree Java Medium Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree 3 71.74 0098 Validate Binary Search Tree Java Medium Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree, Data_Structure_I_Day_14_Tree 0 100.00 0097 Interleaving String Java Medium String, Dynamic_Programming 1 96.15 0096 Unique Binary Search Trees Java 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 Java Medium Dynamic_Programming, Tree, Binary_Tree, Backtracking, Binary_Search_Tree 1 97.38 0094 Binary Tree Inorder Traversal Java 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 Java Medium String, Backtracking 12 26.89 0092 Reverse Linked List II Java Medium Linked_List 0 100.00 0091 Decode Ways Java Medium Top_Interview_Questions, String, Dynamic_Programming, Algorithm_II_Day_15_Dynamic_Programming, Dynamic_Programming_I_Day_10 2 64.33 0090 Subsets II Java Medium Array, Bit_Manipulation, Backtracking, Algorithm_II_Day_9_Recursion_Backtracking 2 75.68 0089 Gray Code Java Medium Math, Bit_Manipulation, Backtracking 2 99.93 0088 Merge Sorted Array Java Easy Top_Interview_Questions, Array, Sorting, Two_Pointers, Data_Structure_I_Day_2_Array 0 100.00 0087 Scramble String Java Hard String, Dynamic_Programming 23 54.15 0086 Partition List Java Medium Two_Pointers, Linked_List 1 59.29 0085 Maximal Rectangle Java Hard Top_100_Liked_Questions, Array, Dynamic_Programming, Matrix, Stack, Monotonic_Stack 4 95.78 0084 Largest Rectangle in Histogram Java Hard Top_100_Liked_Questions, Top_Interview_Questions, Array, Stack, Monotonic_Stack 11 94.31 0083 Remove Duplicates from Sorted List Java Easy Linked_List, Data_Structure_I_Day_8_Linked_List 0 100.00 0082 Remove Duplicates from Sorted List II Java Medium Two_Pointers, Linked_List, Data_Structure_II_Day_11_Linked_List, Algorithm_II_Day_3_Two_Pointers 1 70.85 0081 Search in Rotated Sorted Array II Java Medium Array, Binary_Search, Binary_Search_II_Day_12 1 73.34 0080 Remove Duplicates from Sorted Array II Java Medium Array, Two_Pointers 1 77.11 0079 Word Search Java Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Matrix, Backtracking, Algorithm_II_Day_11_Recursion_Backtracking 178 45.01 0078 Subsets Java Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Bit_Manipulation, Backtracking, Algorithm_II_Day_9_Recursion_Backtracking 1 79.43 0077 Combinations Java Medium Backtracking, Algorithm_I_Day_11_Recursion_Backtracking 5 89.72 0076 Minimum Window Substring Java Hard Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Sliding_Window 3 98.09 0075 Sort Colors Java Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Two_Pointers, Data_Structure_II_Day_2_Array 1 33.23 0074 Search a 2D Matrix Java 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 Java Medium Top_Interview_Questions, Array, Hash_Table, Matrix 2 60.26 0072 Edit Distance Java Hard Top_100_Liked_Questions, String, Dynamic_Programming, Algorithm_II_Day_18_Dynamic_Programming, Dynamic_Programming_I_Day_19 7 66.86 0071 Simplify Path Java Medium String, Stack 4 87.52 0070 Climbing Stairs Java Easy Top_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Math, Memoization, Algorithm_I_Day_12_Dynamic_Programming, Dynamic_Programming_I_Day_2 0 100.00 0069 Sqrt(x) Java Easy Top_Interview_Questions, Math, Binary_Search, Binary_Search_I_Day_4 1 99.48 0068 Text Justification Java Hard Array, String, Simulation 1 77.17 0067 Add Binary Java Easy String, Math, Bit_Manipulation, Simulation, Programming_Skills_II_Day_5 3 67.14 0066 Plus One Java Easy Top_Interview_Questions, Array, Math, Programming_Skills_II_Day_3 0 100.00 0065 Valid Number Java Hard String 4 46.38 0064 Minimum Path Sum Java Medium Top_100_Liked_Questions, Array, Dynamic_Programming, Matrix, Dynamic_Programming_I_Day_16 1 99.65 0063 Unique Paths II Java Medium Array, Dynamic_Programming, Matrix, Dynamic_Programming_I_Day_15 1 56.99 0062 Unique Paths Java Medium Top_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Math, Combinatorics, Algorithm_II_Day_13_Dynamic_Programming, Dynamic_Programming_I_Day_15 1 45.44 0061 Rotate List Java Medium Two_Pointers, Linked_List, Programming_Skills_II_Day_16 0 100.00 0060 Permutation Sequence Java Hard Math, Recursion 0 100.00 0059 Spiral Matrix II Java Medium Array, Matrix, Simulation, Data_Structure_II_Day_3_Array 0 100.00 0058 Length of Last Word Java Easy String, Programming_Skills_II_Day_6 0 100.00 0057 Insert Interval Java Medium Array 1 99.15 0056 Merge Intervals Java Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Data_Structure_II_Day_2_Array 22 12.57 0055 Jump Game Java Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Greedy, Algorithm_II_Day_12_Dynamic_Programming, Dynamic_Programming_I_Day_4 2 87.28 0054 Spiral Matrix Java Medium Top_Interview_Questions, Array, Matrix, Simulation, Programming_Skills_II_Day_8 0 100.00 0053 Maximum Subarray Java 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 1 100.00 0052 N-Queens II Java Hard Backtracking 1 95.66 0051 N-Queens Java Hard Array, Backtracking 3 87.94 0050 Pow(x, n) Java Medium Top_Interview_Questions, Math, Recursion 1 71.59 0049 Group Anagrams Java Medium Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Sorting, Data_Structure_II_Day_8_String, Programming_Skills_II_Day_11 10 74.79 0048 Rotate Image Java 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 Java Medium Array, Backtracking, Algorithm_II_Day_10_Recursion_Backtracking 2 86.24 0046 Permutations Java Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Backtracking, Algorithm_I_Day_11_Recursion_Backtracking 2 71.89 0045 Jump Game II Java Medium Top_100_Liked_Questions, Array, Dynamic_Programming, Greedy, Algorithm_II_Day_13_Dynamic_Programming, Dynamic_Programming_I_Day_4 1 99.67 0044 Wildcard Matching Java Hard Top_Interview_Questions, String, Dynamic_Programming, Greedy, Recursion 4 92.10 0043 Multiply Strings Java Medium String, Math, Simulation, Data_Structure_II_Day_8_String, Programming_Skills_II_Day_4 3 96.85 0042 Trapping Rain Water Java Hard Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Two_Pointers, Stack, Monotonic_Stack, Dynamic_Programming_I_Day_9 1 92.60 0041 First Missing Positive Java Hard Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table 3 85.60 0040 Combination Sum II Java Medium Array, Backtracking, Algorithm_II_Day_10_Recursion_Backtracking 4 82.05 0039 Combination Sum Java Medium Top_100_Liked_Questions, Array, Backtracking, Algorithm_II_Day_10_Recursion_Backtracking 1 100.00 0038 Count and Say Java Medium Top_Interview_Questions, String 3 84.24 0037 Sudoku Solver Java Hard Array, Matrix, Backtracking 6 88.24 0036 Valid Sudoku Java Medium Top_Interview_Questions, Array, Hash_Table, Matrix, Data_Structure_I_Day_5_Array 2 92.22 0035 Search Insert Position Java 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 Java Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search, Algorithm_II_Day_1_Binary_Search, Binary_Search_I_Day_5 1 30.87 0033 Search in Rotated Sorted Array Java 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 Java Hard Top_100_Liked_Questions, String, Dynamic_Programming, Stack 2 89.17 0031 Next Permutation Java Medium Top_100_Liked_Questions, Array, Two_Pointers 1 74.73 0030 Substring with Concatenation of All Words Java Hard String, Hash_Table, Sliding_Window 7 98.08 0029 Divide Two Integers Java Medium Top_Interview_Questions, Math, Bit_Manipulation 3 33.42 0028 Implement strStr() Java Easy Top_Interview_Questions, String, Two_Pointers, String_Matching, Programming_Skills_II_Day_1 462 62.14 0027 Remove Element Java Easy Array, Two_Pointers 0 100.00 0026 Remove Duplicates from Sorted Array Java Easy Top_Interview_Questions, Array, Two_Pointers 1 88.35 0025 Reverse Nodes in k-Group Java Hard Top_100_Liked_Questions, Linked_List, Recursion, Data_Structure_II_Day_13_Linked_List 0 100.00 0024 Swap Nodes in Pairs Java Medium Top_100_Liked_Questions, Linked_List, Recursion, Data_Structure_II_Day_12_Linked_List 0 100.00 0023 Merge k Sorted Lists Java Hard Top_100_Liked_Questions, Top_Interview_Questions, Heap_Priority_Queue, Linked_List, Divide_and_Conquer, Merge_Sort 1 100.00 0022 Generate Parentheses Java Medium Top_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming, Backtracking, Algorithm_II_Day_11_Recursion_Backtracking 1 87.91 0021 Merge Two Sorted Lists Java Easy Top_100_Liked_Questions, Top_Interview_Questions, Linked_List, Recursion, Data_Structure_I_Day_7_Linked_List, Algorithm_I_Day_10_Recursion_Backtracking 1 61.88 0020 Valid Parentheses Java Easy Top_100_Liked_Questions, Top_Interview_Questions, String, Stack, Data_Structure_I_Day_9_Stack_Queue 3 53.65 0019 Remove Nth Node From End of List Java Medium Top_100_Liked_Questions, Top_Interview_Questions, Two_Pointers, Linked_List, Algorithm_I_Day_5_Two_Pointers 1 56.40 0018 4Sum Java Medium Array, Sorting, Two_Pointers 24 60.61 0017 Letter Combinations of a Phone Number Java Medium Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Backtracking, Algorithm_II_Day_11_Recursion_Backtracking 1 87.99 0016 3Sum Closest Java Medium Array, Sorting, Two_Pointers 3 99.31 0015 3Sum Java Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Two_Pointers, Data_Structure_II_Day_1_Array, Algorithm_II_Day_3_Two_Pointers 29 68.11 0014 Longest Common Prefix Java Easy Top_Interview_Questions, String 1 79.65 0013 Roman to Integer Java Easy Top_Interview_Questions, String, Hash_Table, Math 5 82.08 0012 Integer to Roman Java Medium String, Hash_Table, Math 7 70.99 0011 Container With Most Water Java Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Greedy, Two_Pointers, Algorithm_II_Day_4_Two_Pointers 3 91.89 0010 Regular Expression Matching Java Hard Top_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming, Recursion 1 100.00 0009 Palindrome Number Java Easy Math 6 99.98 0008 String to Integer (atoi) Java Medium Top_Interview_Questions, String 2 83.27 0007 Reverse Integer Java Medium Top_Interview_Questions, Math 2 66.13 0006 Zigzag Conversion Java Medium String 4 92.78 0005 Longest Palindromic Substring Java 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 8 98.93 0004 Median of Two Sorted Arrays Java Hard Top_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search, Divide_and_Conquer 3 79.08 0003 Longest Substring Without Repeating Characters Java Medium Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Sliding_Window, Algorithm_I_Day_6_Sliding_Window 3 95.99 0002 Add Two Numbers Java Medium Top_100_Liked_Questions, Top_Interview_Questions, Math, Linked_List, Recursion, Data_Structure_II_Day_10_Linked_List, Programming_Skills_II_Day_15 1 100.00 0001 Two Sum Java Easy Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Data_Structure_I_Day_2_Array 3 80.08