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1 Best Time to Buy and Sell Stock Easy 2 Min Stack Medium 3 Search a 2D Matrix Medium 4 Merge Two Sorted Lists Easy 5 LRU Cache Medium 6 Same Tree Easy 7 Kth Smallest Element in a BST Medium 8 Kth Largest Element in a Stream Easy 9 Subsets Medium 10 Letter Combinations of a Phone Number Medium 11 Rotting Oranges Medium 12 Word Ladder Hard 13 Climbing Stairs Easy 14 Coin Change Medium 15 Best Time to Buy and Sell Stock with Cooldown Medium 16 Burst Balloons Hard 17 Merge Triplets to Form Target Triplet Medium 18 Meeting Rooms II Medium 19 Pow(x, n) Medium 20 Missing Number Easy 21 Top K Frequent Elements Medium 22 3Sum Medium 23 Minimum Window Substring Hard 24 Car Fleet Medium 25 Time Based Key-Value Store Medium 26 Add Two Numbers Medium 27 Maximum Depth of Binary Tree Easy 28 Binary Tree Right Side View Medium 29 Implement Trie (Prefix Tree) Medium 30 Task Scheduler Medium 31 Combination Sum II Medium 32 Max Area of Island Medium 33 Redundant Connection Medium 34 Swim in Rising Water Hard 35 Longest Palindromic Substring Medium 36 Partition Equal Subset Sum Medium 37 Longest Increasing Path in a Matrix Hard 38 Jump Game II Medium 39 Merge Intervals Medium 40 Set Matrix Zeroes Medium