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1 Kth Largest Element in an Array Medium 2 Subsets II Medium 3 Clone Graph Medium 4 Course Schedule II Medium 5 Network Delay Time Medium 6 House Robber II Medium 7 Longest Increasing Subsequence Medium 8 Interleaving String Medium 9 Jump Game Medium 10 Insert Interval Medium 11 Spiral Matrix Medium 12 Single Number Easy 13 Contains Duplicate Easy 14 Encode and Decode Strings Medium 15 Best Time to Buy and Sell Stock Easy 16 Min Stack Medium 17 Search a 2D Matrix Medium 18 Merge Two Sorted Lists Easy 19 LRU Cache Medium 20 Same Tree Easy 21 Kth Smallest Element in a BST Medium 22 Kth Largest Element in a Stream Easy 23 Subsets Medium 24 Letter Combinations of a Phone Number Medium 25 Rotting Oranges Medium 26 Word Ladder Hard 27 Climbing Stairs Easy 28 Coin Change Medium 29 Best Time to Buy and Sell Stock with Cooldown Medium 30 Burst Balloons Hard