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