DoorDash

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