1 Two Sum Python, Java $O(n)$ $O(n)$ - 99.78% 88.62% 2 Add Two Numbers Python, Java $O(n+m)$ $O(1)$ - 99.36% 95.33% 3 Longest Substring Without Repeating Characters Python, Java $O(n)$ $O(1)$ - 100.00% 91.50% 6 Zigzag Conversion Python $O(n)$ $O(n)$ - - - 8 String to Integer (atoi) Python $O(n)$ $O(n)$ RegEx 94.55% 100.00% 9 Palindrome Number Python, Java $O(\log_{10} n)$ $O(1)$ - 95.52% 100.00% 10 Regular Expression Matching Python $O(n*m)$ $O(n*m)$ DP - - 11 Container With Most Water Python, Java $O(n)$ $O(1)$ Two Pointers 98.13% 91.81% 12 Integer to Roman Python $O(1)$ $O(1)$ - - - 13 Roman to Integer Python $O(1)$ $O(1)$ - - - 14 Longest Common Prefix Python $O(n)$ $O(1)$ - - - 15 3Sum Python $O(n^{2})$ $O(1)$ Two Pointers - - 19 Remove Nth Node From End of List Python, Java $O(n)$ $O(1)$ - - - 20 Valid Parentheses Python, Java $O(n)$ $O(n)$ Stack 99.78% 94.20% 22 Generate Parentheses Python, Java $O(2^{n})$ $O(n)$ Backtracking - - 26 Remove Duplicates from Sorted Array Python, Java $O(n)$ $O(1)$ - 100.00% 85.81% 27 Remove Element Python, Java $O(n)$ $O(1)$ - 100.00% 85.12% 30 Substring with Concatenation of All Words Python $O(n*k)$ $O(m*k)$ - - - 36 Valid Sudoku Python, Java $O(n^{2})$ $O(n^{2})$ - 100.00% 97.10% 38 Count and Say Python $O(2^{n})$ $O(2^{n})$ - - - 42 Trapping Rain Water Python $O(n)$ $O(n)$ - - - 48 Rotate Image Python $O(n^{2})$ $O(1)$ - 99.29% 98.14% 49 Group Anagrams Python $O(n * m * \log_{2} m)$ $O(n * m)$ - - - 50 Pow(x, n) Python $O(\log_{2} n)$ $O(\log_{2} n)$ BinPow - - 53 Maximum Subarray Python, Java $O(n)$ $O(1)$ Kadane's 100.00% 93.17% 54 Spiral Matrix Python ? ? - - - 55 Jump Game Python $O(n)$ $O(1)$ - - - 61 Rotate List Python $O(n)$ $O(1)$ - - - 62 Unique Paths Python, Java $O(min(n,m))$ $O(1)$ DP / Math - - 68 Text Justification Python $O(n)$ $O(n)$ - - - 70 Climbing Stairs Python $O(n)$ $O(n)$ DP - - 71 Simplify Path Python $O(n)$ $O(n)$ - - - 72 Edit Distance Python, Java $O(n*m)$ $O(n*m)$ DP 92.85% 91.32% 73 Set Matrix Zeroes Python $O(n * m)$ $O(n + m)$ - 97.19% 53.65% 74 Search a 2D Matrix Python, Java $O(\log_{2} (n*m))$ $O(1)$ Binary Search - - 78 Subsets Python $O(2^{n})$ $O(n)$ - - - 79 Word Search Python $O(n * m * k)$ $O(k)$ DFS 99.72% 93.26% 80 Remove Duplicates from Sorted Array II Python $O(n)$ $O(1)$ - - - 82 Remove Duplicates from Sorted List II Python $O(n)$ $O(1)$ - - - 86 Partition List Python $O(n)$ $O(1)$ - - - 88 Merge Sorted Array Python, Java $O(n + m)$ $O(1)$ - 100.00% 83.33% 89 Gray Code Python, Java $O(2^{n})$ $O(1)$ Math 96.07% 97.95% 91 Decode Ways Python $O(n)$ $O(n)$ DP - - 94 Binary Tree Inorder Traversal Python $O(n)$ $O(n)$ - - - 95 Unique Binary Search Trees II Python $O(n^{2})$ $O(\log_{2} n)$ DP - - 96 Unique Binary Search Trees Python $O(n)$ $O(1)$ DP, Math - - 98 Validate Binary Search Tree Python $O(n)$ $O(n)$ DFS - - 100 Same Tree Python $O(n)$ $O(H)$ - - - 101 Symmetric Tree Python $O(n)$ $O(n)$ DFS, BFS - - 104 Maximum Depth of Binary Tree Python $O(n)$ $O(n)$ DFS - - 108 Convert Sorted Array to Binary Search Tree Python $O(n)$ $O(\log_{2} n)$ - - - 109 Convert Sorted List to Binary Search Tree Python $O(n*\log_{2} n)$ $O(\log_{2} n)$ DFS - - 111 Minimum Depth of Binary Tree Python, Java $O(n)$ $O(n)$ - 99.77% 94.85% 112 Path Sum Python $O(n)$ $O(n)$ DFS - - 113 Path Sum II Python - - - - - 114 Flatten Binary Tree to Linked List Python $O(n)$ $O(1)$ - - - 124 Binary Tree Maximum Path Sum Python $O(n)$ $O(n)$ - - - 125 Valid Palindrome Python, Java $O(n)$ $O(1)$ - 99.31% 92.66% 126 Word Ladder II Python - - - - - 127 Word Ladder Python - - - - - 129 Sum Root to Leaf Numbers Python $O(n)$ $O(h)$ DFS 97.50% 95.89% 136 Single Number Python, Java $O(n)$ $O(1)$ - 100.00% 93.84% 141 Linked List Cycle Python, Java $O(n)$ $O(1)$ - 100.00% 95.88% 150 Evaluate Reverse Polish Notation Python $O(n)$ $O(n)$ - - - 151 Reverse Words in a String Python $O(n)$ $O(n)$ - - - 155 Min Stack Python $O(1)$ $O(n)$ - - - 165 Compare Version Numbers Python $O(max(n,m))$ $O(n+m)$ - - - 168 Excel Sheet Column Title Python $O(\log_{26} n)$ $O(1)$ - - - 172 Factorial Trailing Zeroes Python $O(\log_{5} n)$ $O(\log_{5} n)$ Math - - 175 Combine Two Tables SQL SQL SQL - - - 176 Second Highest Salary SQL SQL SQL - - - 177 Nth Highest Salary SQL SQL SQL - - - 178 Rank Scores SQL SQL SQL - - - 180 Consecutive Numbers SQL SQL SQL - - - 181 Employees Earning More Than Their Managers SQL SQL SQL - - - 182 Duplicate Emails SQL SQL SQL - - - 183 Customers Who Never Order SQL SQL SQL - - - 184 Department Highest Salary SQL SQL SQL - - - 185 Department Top Three Salaries SQL SQL SQL - - - 189 Rotate Array Python, Java $O(n)$ $O(1)$ - - - 190 Reverse Bits Python, Java $O(1)$ $O(1)$ - - - 191 Number of 1 Bits Python $O(\log_{10} n)$ $O(1)$ - - - 192 Word Frequency Shell SHELL SHELL - - - 193 Valid Phone Numbers Shell SHELL SHELL - - - 194 Transpose File Shell SHELL SHELL - - - 195 Tenth Line Shell SHELL SHELL - - - 196 Delete Duplicate Emails SQL SQL SQL - - - 197 Rising Temperature SQL SQL SQL - - - 198 House Robber Python $O(n)$ $O(n)$ DP - - 200 Number of Islands Python, Java $O(n*m)$ $O(n*m)$ DFS - - 201 Bitwise AND of Numbers Range Python, Java $O(\log_{2} n)$ $O(1)$ - - - 206 Reverse Linked List Python $O(n)$ $O(1)$ - - - 207 Course Schedule Python - - - - - 209 Minimum Size Subarray Sum Python, Java $O(n)$ $O(1)$ - - - 217 Contains Duplicate Python, Java $O(n)$ $O(n)$ - - - 219 Contains Duplicate II Python, Java $O(n)$ $O(n)$ - - - 222 Count Complete Tree Nodes Python $O(\log_{2}^{2} n)$ $O(\log_{2} n)$ - - - 223 Rectangle Area Python $O(1)$ $O(1)$ Math - - 226 Invert Binary Tree Python, Java $O(n)$ $O(n)$ - - - 234 Palindrome Linked List Python $O(n)$ $O(1)$ - - - 235 Lowest Common Ancestor of a Binary Search Tree Python $O(n)$ $O(n)$ - - - 237 Delete Node in a Linked List Python, Java $O(1)$ $O(1)$ - - - 242 Valid Anagram Python $O(max(n,m))$ $O(n+m)$ - - - 258 Add Digits Python $O(1)$ $O(1)$ - - - 263 Ugly Number Python $O(\log_{2} n)$ $O(1)$ - 99.59% 60.80% 278 First Bad Version Python, Java $O(\log_{2} n)$ $O(1)$ - - - 279 Perfect Squares Python $O(n*\sqrt{n})$ $O(n)$ - - - 283 Move Zeroes Python $O(n)$ $O(1)$ - - - 290 Word Pattern Python $O(n)$ $O(n)$ - - - 292 Nim Game Python, Java $O(1)$ $O(1)$ Math - - 297 Serialize and Deserialize Binary Tree Python $O(n)$ $O(n)$ Preorder - - 300 Longest Increasing Subsequence Python $O(n*\log_{2} n)$ $O(n)$ - - - 304 Range Sum Query 2D - Immutable Python $O(n*m) + O(1)$ $O(n*m) + O(1)$ - - - 307 Range Sum Query - Mutable Python $O(n * \log_{2} n) + O(\log_{2} n)$ $O(n) + O(1)$ - - - 326 Power of Three Python $O(1)$ $O(1)$ - - - 329 Longest Increasing Path in a Matrix Python $O(n * m)$ $O(n * m)$ - - - 334 Increasing Triplet Subsequence Python, Java $O(n)$ $O(1)$ - - - 336 Palindrome Pairs Python $O(n * k^{2})$ $O(n)$ - - - 342 Power of Four Python $O(1)$ $O(1)$ - - - 345 Reverse Vowels of a String Python $O(n)$ $O(n)$ - - - 365 Water and Jug Problem Python $O(\log_{2} max(n, m))$ $O(\log_{2} max(n, m))$ - - - 374 Guess Number Higher or Lower Python $O(\log_{2} n)$ $O(1)$ - 75.79% 66.34% 377 Combination Sum IV Python $O(2^{n})$ $O(n)$ - - - 383 Ransom Note Python, Java $O(n+m)$ $O(n+m)$ - - - 387 First Unique Character in a String Python $O(n)$ $O(1)$ - - - 390 Elimination Game Python, Java $O(\log_{2} n)$ $O(\log_{2} n)$ - - - 393 UTF-8 Validation Python $O(n)$ $O(1)$ - - - 412 Fizz Buzz Python, Java $O(n)$ $O(1)$ - - - 417 Pacific Atlantic Water Flow Python $O(n * m)$ $O(n * m)$ DFS - - 424 Longest Repeating Character Replacement Python $O(n)$ $O(1)$ - - - 429 N-ary Tree Level Order Traversal Python $O(n)$ $O(n)$ - - - 433 Minimum Genetic Mutation Python $O(n*m^{2})$ $O(n)$ - - - 443 String Compression Python $O(n)$ $O(1)$ - - - 452 Minimum Number of Arrows to Burst Balloons Python $O(n * \log_{2} n)$ $O(1)$ Greedy - - 463 Island Perimeter Python, Java $O(n*m)$ $O(1)$ - 94.28% 94.13% 468 Validate IP Address Python $O(1)$ $O(1)$ RegEx - - 491 Non-decreasing Subsequences Python $O(n^{2})$ $O(n^{2})$ - - - 494 Target Sum Python $O(n*t)$ $O(n*t)$ - - - 495 Teemo Attacking Python $O(n)$ $O(1)$ - - - 497 Random Point in Non-overlapping Rectangles Python $O(n) + O(\log_{2} n)$ $O(n) + O(1)$ - - - 506 Relative Ranks Python $O(n * \log_{2} n)$ $O(n)$ - - - 508 Most Frequent Subtree Sum Python $O(n)$ $O(n)$ - - - 511 Game Play Analysis I SQL SQL SQL - - - 520 Detect Capital Python $O(n)$ $O(1)$ - - - 523 Continuous Subarray Sum Python, Java $O(n)$ $O(n)$ - 95.90% 91.04% 543 Diameter of Binary Tree Python $O(n)$ $O(n)$ - - - 547 Number of Provinces Python $O(n^{2})$ $O(n)$ DSU - - 551 Student Attendance Record I Python, Java $O(n)$ $O(1)$ - 100.00% 91.95% 557 Reverse Words in a String III Python, Java $O(n)$ $O(n)$ - 99.26% 48.16% 560 Subarray Sum Equals K Python $O(n)$ $O(n)$ - - - 565 Array Nesting Python $O(n)$ $O(n)$ - - - 575 Distribute Candies Python, Java $O(n)$ $O(n)$ - - - 584 Find Customer Referee SQL SQL SQL - - - 586 Customer Placing the Largest Number of Orders SQL SQL SQL - - - 592 Fraction Addition and Subtraction Python $O(n)$ $O(n)$ - - - 595 Big Countries SQL SQL SQL - - - 596 Classes More Than 5 Students SQL SQL SQL - - - 598 Range Addition II Python, Java $O(n)$ $O(1)$ - - - 606 Construct String from Binary Tree Python $O(n)$ $O(n)$ - - - 607 Sales Person SQL SQL SQL - - - 608 Tree Node SQL SQL SQL - - - 609 Find Duplicate File in System Python $O(n*k)$ $O(n*k)$ - - - 620 Not Boring Movies SQL SQL SQL - - - 622 Design Circular Queue Python $O(k) / O(1)$ $O(k) / O(1)$ - - - 623 Add One Row to Tree Python $O(n)$ $O(n)$ - - - 627 Swap Salary SQL SQL SQL - - - 637 Average of Levels in Binary Tree Python $O(n)$ $O(\log_{2} n)$ - - - 643 Maximum Average Subarray I Python $O(n)$ $O(1)$ Sliding Window - - 645 Set Mismatch Python $O(n)$ $O(1)$ - 92.30% 74.26% 653 Two Sum IV - Input is a BST Python $O(n)$ $O(h)$ - - - 658 Find K Closest Elements Python $O(k + \log_{2} n)$ $O(1)$ Binary Search - - 659 Split Array into Consecutive Subsequences Python $O(n)$ $O(n)$ - - - 680 Valid Palindrome II Python $O(n)$ $O(1)$ - - - 692 Top K Frequent Words Python $O(n * \log_{2} n)$ $O(n)$ - - - 695 Max Area of Island Python $O(n*m)$ $O(n*m)$ DFS - - 696 Count Binary Substrings Python, Java $O(n)$ $O(1)$ - - - 700 Search in a Binary Search Tree Python $O(n)$ $O(1)$ - - - 704 Binary Search Python $O(\log_{2} n)$ $O(1)$ - - - 717 1-bit and 2-bit Characters Python, Java $O(n)$ $O(1)$ - - - 718 Maximum Length of Repeated Subarray Python $O(n*m)$ $O(n*m)$ DP - - 733 Flood Fill Python $O(n*m)$ $O(n*m)$ DFS - - 747 Largest Number At Least Twice of Others Python $O(n)$ $O(1)$ - - - 748 Shortest Completing Word Python $O(n^{2})$ $O(n^{2})$ - - - 752 Open the Lock Python $O(n)$ $O(n)$ BFS - - 766 Toeplitz Matrix Python $O(n*m)$ $O(1)$ - 71.85% 99.92% 777 Swap Adjacent in LR String Python, Java $O(n)$ $O(1)$ Two Pointers 100.00% 98.78% 788 Rotated Digits Python $O(n * \log_{10} n)$ $O(\log_{10} n)$ - - - 791 Custom Sort String Python $O(n * \log_{2} n)$ $O(n + m)$ - - - 797 All Paths From Source to Target Python $O(n)$ $O(n)$ - - - 802 Find Eventual Safe States Python $O(V+E)$ $O(V)$ - - - 804 Unique Morse Code Words Python $O(n)$ $O(n)$ - - - 811 Subdomain Visit Count Python $O(n*k)$ $O(n*k)$ - - - 814 Binary Tree Pruning Python $O(n)$ $O(n)$ - - - 823 Binary Trees With Factors Python $O(n^{2})$ $O(n)$ - - - 830 Positions of Large Groups Python, Java $O(n)$ $O(1)$ - - - 835 Image Overlap Python $O(n^{4})$ $O(1)$ - 97.08% 52.05% 836 Rectangle Overlap Python $O(1)$ $O(1)$ Math - - 838 Push Dominoes Python $O(n)$ $O(n)$ - - - 841 Keys and Rooms Python $O(n)$ $O(n)$ - - - 844 Backspace String Compare Python $O(min(n,m))$ $O(1)$ - - - 847 Shortest Path Visiting All Nodes Python $O(n^{2}*2^{n})$ $O(n*2^{n})$ BFS - - 860 Lemonade Change Python, Java $O(n)$ $O(1)$ - - - 867 Transpose Matrix Python, Java $O(n*m)$ $O(1)$ - - - 869 Reordered Power of 2 Python $O({\log_{2} n}^{2})$ $O(\log_{2} n)$ - - - 871 Minimum Number of Refueling Stops Python $O(n * \log_{2} n)$ $O(n)$ - - - 872 Leaf-Similar Trees Python $O(H)$ $O(H)$ - 91.29% 87.58% 875 Koko Eating Bananas Python $O(n * \log_{2} M)$ $O(1)$ Binary Search 98.57% 62.98% 876 Middle of the Linked List Python, Java $O(n)$ $O(1)$ - 100.00% 99.73% 877 Stone Game Python, Java $O(1)$ $O(1)$ - - - 886 Possible Bipartition Python $O(V + E)$ $O(V + E)$ DFS - - 890 Find and Replace Pattern Python $O(n*k)$ $O(k)$ - - - 893 Groups of Special-Equivalent Strings Python $O(n * k * \log_{2} k)$ $O(n * k)$ - 93.51% 88.11% 894 All Possible Full Binary Trees Python $O(2^{n})$ $O(2^{n})$ - - - 895 Maximum Frequency Stack Python $O(n)$ $O(n)+O(1)$ - - - 896 Monotonic Array Python $O(n)$ $O(1)$ - 98.61% 94.23% 904 Fruit Into Baskets Python $O(n)$ $O(k)$ - - - 921 Minimum Add to Make Parentheses Valid Python, Java $O(n)$ $O(1)$ - - - 923 3Sum With Multiplicity Python $O(k^{2})$ $O(k)$ - - - 925 Long Pressed Name Python, Java $O(max(n,m))$ $O(1)$ - - - 926 Flip String to Monotone Increasing Python - - - - - 930 Binary Subarrays With Sum Python $O(n)$ $O(n)$ - - - 931 Minimum Falling Path Sum Python $O(n * m)$ $O(1)$ DP 40.57% 92.88% 936 Stamping The Sequence Python $O(m*(m-n))$ $O(m*(m-n))$ - - - 938 Range Sum of BST Python $O(n)$ $O(n)$ DFS - - 944 Delete Columns to Make Sorted Python $O(m * n * \log_{2} n)$ $O(n)$ - - - 946 Validate Stack Sequences Python $O(n)$ $O(n)$ - - - 948 Bag of Tokens Python $O(n * \log_{2} n)$ $O(1)$ Two-pointer - - 954 Array of Doubled Pairs Python - - - - - 959 Regions Cut By Slashes Python $O(n*m)$ $O(n*m)$ DFS - - 967 Numbers With Same Consecutive Differences Python $O(2^{n})$ $O(2^{n})$ DFS - - 976 Largest Perimeter Triangle Python, Java $O(n * \log_{2} n)$ $O(1)$ - - - 977 Squares of a Sorted Array Python $O(n)$ $O(n)$ - - - 980 Unique Paths III Python - - - - - 982 Triples with Bitwise AND Equal To Zero Python $O(n^{3})$ $O(n^{2})$ - - - 985 Sum of Even Numbers After Queries Python, Java $O(n + m)$ $O(1)$ - - - 986 Interval List Intersections Python $O(n+m)$ $O(n+m)$ - - - 988 Smallest String Starting From Leaf Python $O(n)$ $O(n)$ DFS - - 989 Add to Array-Form of Integer Python $O(\log_{10} k)$ $O(1)$ - - - 990 Satisfiability of Equality Equations Python $O(n)$ $O(n)$ - - - 997 Find the Town Judge Python $O(n)$ $O(n)$ - - - 998 Maximum Binary Tree II Python $O(n)$ $O(n)$ - - - 999 Available Captures for Rook Python $O(1)$ $O(1)$ - - - 1006 Clumsy Factorial Python $O(1)$ $O(1)$ - 96.15% 97.93% 1007 Minimum Domino Rotations For Equal Row Python $O(n)$ $O(1)$ - - - 1010 Pairs of Songs With Total Durations Divisible by 60 Python, Java $O(n)$ $O(1)$ - 96.43% 85.53% 1020 Number of Enclaves Python $O(n*m)$ $O(n*m)$ DFS - - 1026 Maximum Difference Between Node and Ancestor Python $O(n)$ $O(n)$ - - - 1030 Matrix Cells in Distance Order Python - - - - - 1039 Minimum Score Triangulation of Polygon Python $O(n^{2})$ $O(n^{2})$ DP - - 1047 Remove All Adjacent Duplicates In String Python $O(n)$ $O(n)$ Stack - - 1048 Longest String Chain Python $O(n*k^{2})$ $O(n)$ - - - 1050 Actors and Directors Who Cooperated At Least Three Times SQL SQL SQL - - - 1071 Greatest Common Divisor of Strings Python $O(n+m)$ $O(n+m)$ - - - 1084 Sales Analysis III SQL SQL SQL - - - 1091 Shortest Path in Binary Matrix Python $O(n^{2})$ $O(n^{2})$ BFS - - 1104 Path In Zigzag Labelled Binary Tree Python $O(\log_{2} n)$ $O(1)$ - 67.53% 73.43% 1114 Print in Order Python CONCURRENCY CONCURRENCY - - - 1131 Maximum of Absolute Value Expression Python $O(n)$ $O(n)$ - - - 1137 N-th Tribonacci Number Python $O(n)$ $O(1)$ - - - 1141 User Activity for the Past 30 Days I SQL SQL SQL - - - 1143 Longest Common Subsequence Python $O(n * m)$ $O(n * m)$ DP 96.32% 81.56% 1148 Article Views I SQL SQL SQL - - - 1155 Number of Dice Rolls With Target Sum Python $O(n*k)$ $O(n*k)$ DP - - 1158 Market Analysis I SQL SQL SQL - - - 1162 As Far from Land as Possible Python $O(n*m)$ $O(n*m)$ - - - 1179 Reformat Department Table SQL SQL SQL - - - 1184 Distance Between Bus Stops Python $O(n)$ $O(1)$ - - - 1207 Unique Number of Occurrences Python $O(n)$ $O(n)$ - 95.89% 72.74% 1220 Count Vowels Permutation Python $O(n)$ $O(1)$ DP - - 1237 Find Positive Integer Solution for a Given Equation Python $O(N + M)$ $O(1)$ - 100.00% 33.63% 1239 Maximum Length of a Concatenated String with Unique Characters Python $O(n^{2})$ $O(n^{2})$ DP 94.14% 8.30% 1249 Minimum Remove to Make Valid Parentheses Python $O(n)$ $O(n)$ - - - 1254 Number of Closed Islands Python $O(n*m)$ $O(n*m)$ DFS - - 1260 Shift 2D Grid Python $O(n^{2})$ $O(n^{2})$ - - - 1275 Find Winner on a Tic Tac Toe Game Python, Java $O(1)$ $O(1)$ - - - 1306 Jump Game III Python $O(n)$ $O(1)$ - - - 1319 Number of Operations to Make Network Connected Python $O(n)$ $O(n)$ - - - 1323 Maximum 69 Number Python $O(n)$ $O(n)$ - - - 1328 Break a Palindrome Python $O(n)$ $O(n)$ - - - 1329 Sort the Matrix Diagonally Python - - - - - 1331 Rank Transform of an Array Python $O(n * \log_{2} n)$ $O(n)$ - - - 1332 Remove Palindromic Subsequences Python, Java $O(n)$ $O(1)$ - - - 1334 Find the City With the Smallest Number of Neighbors at a Threshold Distance Python, Java $O(n^{3})$ $O(n^{2})$ Floyd-Warshall's 100.00% 95.65% 1338 Reduce Array Size to The Half Python $O(n * \log_{2} n)$ $O(n)$ - - - 1342 Number of Steps to Reduce a Number to Zero Python $O(1)$ $O(1)$ Bit Manipulation 96.74% 95.47% 1345 Jump Game IV Python - - - - - 1347 Minimum Number of Steps to Make Two Strings Anagram Python $O(n)$ $O(1)$ - - - 1376 Time Needed to Inform All Employees Python $O(n)$ $O(n)$ DFS - - 1381 Design a Stack With Increment Operation Python - - - - - 1383 Maximum Performance of a Team Python $O(n * \log_{2} n)$ $O(n)$ - - - 1387 Sort Integers by The Power Value Python $O(n * \log_{2} n)$ $O(n)$ - - - 1393 Capital Gain/Loss SQL SQL SQL - - - 1407 Top Travellers SQL SQL SQL - - - 1408 String Matching in an Array Python $O(n^{2}*k^{2})$ $O(1)$ - - - 1414 Find the Minimum Number of Fibonacci Numbers Whose Sum Is K Python $O(\log_{2} k)$ $O(\log_{2} k)$ - - - 1423 Maximum Points You Can Obtain from Cards Python $O(n)$ $O(1)$ Sliding Window - - 1437 Check If All 1's Are at Least Length K Places Away Python, Java $O(n)$ $O(1)$ - - - 1448 Count Good Nodes in Binary Tree Python $O(n)$ $O(n)$ DFS - - 1457 Pseudo-Palindromic Paths in a Binary Tree Python, Java $O(n)$ $O(n)$ DFS - - 1466 Reorder Routes to Make All Paths Lead to the City Zero Python $O(n)$ $O(n)$ DFS - - 1470 Shuffle the Array Python, Java $O(n)$ $O(1)$ - - - 1472 Design Browser History Python - - - - - 1480 Running Sum of 1d Array Python $O(n)$ $O(1)$ - - - 1484 Group Sold Products By The Date SQL SQL SQL - - - 1493 Longest Subarray of 1's After Deleting One Element Python, Java $O(n)$ $O(1)$ - - - 1496 Path Crossing Python $O(n)$ $O(n)$ - - - 1513 Number of Substrings With Only 1s Python $O(n)$ $O(1)$ - 92.33% 100.00% 1523 Count Odd Numbers in an Interval Range Python - - - - - 1527 Patients With a Condition SQL SQL SQL - - - 1539 Kth Missing Positive Number Python $O(n)$ $O(n)$ - - - 1544 Make The String Great Python $O(n)$ $O(n)$ Stack 94.50% 97.99% 1557 Minimum Number of Vertices to Reach All Nodes Python, Java $O(n)$ $O(n)$ - - - 1576 Replace All ?'s to Avoid Consecutive Repeating Characters Python $O(n)$ $O(n)$ - - - 1578 Minimum Time to Make Rope Colorful Python $O(n)$ $O(1)$ - - - 1581 Customer Who Visited but Did Not Make Any Transactions SQL SQL SQL - - - 1587 Bank Account Summary II SQL SQL SQL - - - 1646 Get Maximum in Generated Array Python $O(n)$ $O(n)$ - - - 1657 Determine if Two Strings Are Close Python $O(n)$ $O(n)$ Sorting 89.60% 94.00% 1662 Check If Two String Arrays are Equivalent Python $O(n)$ $O(1)$ - 99.41% 98.50% 1663 Smallest String With A Given Numeric Value Python $O(n)$ $O(n)$ - - - 1667 Fix Names in a Table SQL SQL SQL - - - 1669 Merge In Between Linked Lists Python $O(n + m)$ $O(1)$ - - - 1672 Richest Customer Wealth Python, Java $O(n*m)$ $O(1)$ - - - 1680 Concatenation of Consecutive Binary Numbers Python $O(n*\log_{2} n)$ $O(1)$ - - - 1684 Count the Number of Consistent Strings Python $O(n+m)$ $O(n+m)$ - - - 1693 Daily Leads and Partners SQL SQL SQL - - - 1729 Find Followers Count SQL SQL SQL - - - 1741 Find Total Time Spent by Each Employee SQL SQL SQL - - - 1752 Check if Array Is Sorted and Rotated Python $O(n)$ $O(1)$ - - - 1757 Recyclable and Low Fat Products SQL SQL SQL - - - 1770 Maximum Score from Performing Multiplication Operations Python $O(m^{2})$ $O(m)$ DP - - 1784 Check if Binary String Has at Most One Segment of Ones Python, Java $O(n)$ $O(1)$ - - - 1795 Rearrange Products Table SQL SQL SQL - - - 1817 Finding the Users Active Minutes Python $O(n)$ $O(n + k)$ Hashing - - 1832 Check if the Sentence Is Pangram Python, Java $O(n)$ $O(1)$ - 92.75% 95.79% 1833 Maximum Ice Cream Bars Python $O(sort)$ $O(n)$ - - - 1839 Longest Substring Of All Vowels in Order Python $O(n)$ $O(1)$ - - - 1848 Minimum Distance to the Target Element Python $O(n)$ $O(1)$ - - - 1869 Longer Contiguous Segments of Ones than Zeros Python - - - - - 1873 Calculate Special Bonus SQL SQL SQL - - - 1876 Substrings of Size Three with Distinct Characters Python, Java $O(n)$ $O(min(n,k))$ Sliding Window - - 1890 The Latest Login in 2020 SQL SQL SQL - - - 1903 Largest Odd Number in String Python $O(n)$ $O(1)$ - - - 1905 Count Sub Islands Python $O(n^{2})$ $O(n^{2})$ DFS - - 1926 Nearest Exit from Entrance in Maze Python $O(n * m)$ $O(n * m)$ BFS 77.25% 55.57% 1945 Sum of Digits of String After Convert Python $O(n)$ $O(n)$ - - - 1962 Remove Stones to Minimize the Total Python $O(n * \log_{2} n)$ $O(1)$ Heap 100.00% 95.88% 1965 Employees With Missing Information SQL SQL SQL - - - 1979 Find Greatest Common Divisor of Array Python, Java $O(n)$ $O(1)$ GCD - - 1984 Minimum Difference Between Highest and Lowest of K Scores Python $O(n*\log_{2} n)$ $O(1)$ - - - 1996 The Number of Weak Characters in the Game Python $O(n * \log_{2} n)$ $O(n)$ - - - 2007 Find Original Array From Doubled Array Python, Java $O(n+k*\log_{2}k)$ $O(k)$ - - - 2022 Convert 1D Array Into 2D Array Python, Java $O(n*m)$ $O(1)$ - - - 2078 Two Furthest Houses With Different Colors Python, Java $O(n)$ $O(1)$ - - - 2095 Delete the Middle Node of a Linked List Python $O(n)$ $O(1)$ - - - 2131 Longest Palindrome by Concatenating Two Letter Words Python - - - - - 2136 Earliest Possible Day of Full Bloom Python $O(n * \log_{2} n)$ $O(n)$ - - - 2185 Counting Words With a Given Prefix Python $O(n*k)$ $O(1)$ - - - 2186 Minimum Number of Steps to Make Two Strings Anagram II Python $O(n+m)$ $O(n+m)$ - - - 2220 Minimum Bit Flips to Convert Number Python, Java $O(\log_{2} n)$ $O(1)$ - 100.00% 97.83% 2225 Find Players With Zero or One Losses Python $O(n * \log_{2} n)$ $O(n)$ - 98.66% 99.40% 2243 Calculate Digit Sum of a String Python $O(\log_{k} n)$ $O(\log_{k} n)$ - - - 2244 Minimum Rounds to Complete All Tasks Python $O(n)$ $O(n)$ Counting - - 2255 Count Prefixes of a Given String Python $O(n*m)$ $O(n*m)$ - - - 2264 Largest 3-Same-Digit Number in String Python $O(n)$ $O(1)$ - - - 2269 Find the K-Beauty of a Number Python $O(\log_{10} n)$ $O(1)$ - - - 2273 Find Resultant Array After Removing Anagrams Python $O(n*k)$ $O(k)$ - - - 2278 Percentage of Letter in String Python, Java $O(n)$ $O(1)$ - - - 2279 Maximum Bags With Full Capacity of Rocks Python $O(n * \log_{2} n)$ $O(n)$ Greedy 99.67% 87.83% 2294 Partition Array Such That Maximum Difference Is K Python, Java $O(n * \log_{2} n)$ $O(1)$ - - - 2299 Strong Password Checker II Python $O(n)$ $O(1)$ - - - 2309 Greatest English Letter in Upper and Lower Case Python $O(1)$ $O(1)$ - - - 2315 Count Asterisks Python $O(n)$ $O(1)$ - - - 2316 Count Unreachable Pairs of Nodes in an Undirected Graph Python $O(n)$ $O(n)$ - - - 2331 Evaluate Boolean Binary Tree Python $O(n)$ $O(n)$ - - - 2335 Minimum Amount of Time to Fill Cups Python $O(1)$ $O(1)$ - - - 2336 Smallest Number in Infinite Set Python $O(1) + O(\log_{2} n)$ $O(n)$ - - - 2337 Move Pieces to Obtain a String Python, Java $O(n)$ $O(1)$ Two Pointers 86.68% 99.25% 2341 Maximum Number of Pairs in Array Python $O(n)$ $O(n)$ - - - 2347 Best Poker Hand Python $O(1)$ $O(1)$ - - - 2348 Number of Zero-Filled Subarrays Python $O(n)$ $O(1)$ Sliding Window - - 2351 First Letter to Appear Twice Python, Java $O(n)$ $O(1)$ - 100.00% 94.36% 2352 Equal Row and Column Pairs Python $O(n^{3}) / O(n^{2})$ $O(1) / O(n)$ - - - 2357 Make Array Zero by Subtracting Equal Amounts Python $O(n)$ $O(n)$ - - - 2359 Find Closest Node to Given Two Nodes Python $O(n)$ $O(n)$ DFS - - 2363 Merge Similar Items Python $O(n*\log_{2} n)$ $O(n)$ - - - 2364 Count Number of Bad Pairs Python $O(n)$ $O(n)$ - - - 2367 Number of Arithmetic Triplets Python $O(n)$ $O(n)$ - - - 2373 Largest Local Values in a Matrix Python $O(n^{2})$ $O(1)$ - - - 2374 Node With Highest Edge Score Python $O(n)$ $O(n)$ - - - 2379 Minimum Recolors to Get K Consecutive Black Blocks Python $O(n)$ $O(k)$ - - - 2380 Time Needed to Rearrange a Binary String Python $O(n)$ $O(1)$ - - - 2383 Minimum Hours of Training to Win a Competition Python, Java $O(n)$ $O(1)$ - - - 2384 Largest Palindromic Number Python $O(1)$ $O(1)$ - - - 2389 Longest Subsequence With Limited Sum Python $O(n*\log_{2} n)$ $O(n)$ - - - 2390 Removing Stars From a String Python - - - - - 2391 Minimum Amount of Time to Collect Garbage Python $O(n)$ $O(1)$ - - - 2395 Find Subarrays With Equal Sum Python $O(n)$ $O(n)$ - - - 2396 Strictly Palindromic Number Python $O(1)$ $O(1)$ - - - 2399 Check Distances Between Same Letters Python $O(1)$ $O(1)$ - - - 2401 Longest Nice Subarray Python, Java $O(n)$ $O(1)$ Sliding Window - - 2404 Most Frequent Even Element Python, Java $O(n)$ $O(n)$ - - - 2405 Optimal Partition of String Python, Java $O(n)$ $O(1)$ - - - 2406 Divide Intervals Into Minimum Number of Groups Python $O(n)$ $O(n)$ - - - 2409 Count Days Spent Together Python $O(1)$ $O(1)$ - - - 2413 Smallest Even Multiple Python, Java $O(1)$ $O(1)$ - - - 2414 Length of the Longest Alphabetical Continuous Substring Python $O(n)$ $O(1)$ - - - 2418 Sort the People Python $O(n * \log_{2} n)$ $O(n)$ - - - 2419 Longest Subarray With Maximum Bitwise AND Python $O(n)$ $O(1)$ - - - 2424 Longest Uploaded Prefix Python $O(1)$ $O(n)$ - - - 2427 Number of Common Factors Python $O(min(n,m))$ $O(1)$ - - - 2428 Maximum Sum of an Hourglass Python $O(n*m)$ $O(n*m)$ - - - 2432 The Employee That Worked on the Longest Task Python $O(n)$ $O(1)$ - - - 2433 Find The Original Array of Prefix Xor Python, Java $O(n)$ $O(1)$ - - - 2441 Largest Positive Integer That Exists With Its Negative Python $O(n) / O(n * \log_{2} n)$ $O(n) / O(1)$ - 98.91% 99.35% 2442 Count Number of Distinct Integers After Reverse Operations Python, Java $O(n)$ $O(n)$ - 99.69% 96.65% 2446 Determine if Two Events Have Conflict Python $O(1)$ $O(1)$ - 89.91% 75.19% 2447 Number of Subarrays With GCD Equal to K Python, Java $O(n^{2} * \log_{2} m)$ $O(1)$ GCD 98.08% 95.20% 2448 Minimum Cost to Make Array Equal Python, Java $O(n * \log_{2} m)$ $O(1)$ Binary Search 99.41% 98.81% 2455 Average Value of Even Numbers That Are Divisible by Three Python $O(n)$ $O(1)$ - 100.00% 85.71% 2482 Difference Between Ones and Zeros in Row and Column Python $O(n * m)$ $O(n + m)$ - - - 2485 Find the Pivot Integer Python $O(√n)$ $O(1)$ Math 99.78% 97.40% 2487 Remove Nodes From Linked List Python - - - - - 2490 Circular Sentence Python $O(n)$ $O(1)$ - - - 2491 Divide Players Into Teams of Equal Skill Python - - - - - 2501 Longest Square Streak in an Array Python $O(n * √n)$ $O(n)$ - - - 2506 Count Pairs Of Similar Strings Python $O(n*m)$ $O(1)$ - - - 2522 Partition String Into Substrings With Values at Most K Python - - - - - 2525 Categorize Box According to Criteria Python $O(1)$ $O(1)$ - - - 2529 Maximum Count of Positive Integer and Negative Integer Python $O(\log_{2} n)$ $O(1)$ - - - 2549 Count Distinct Numbers on Board Python - - - - - 2563 Count the Number of Fair Pairs Python - - - - - 2574 Left and Right Sum Differences Python - - - - -