LeetCode # Title Category Difficulty Solution 1046 Last Stone Weight Algorithms Easy Python 1008 Construct Binary Search Tree from Preorder Traversal Algorithms Medium Python 994 Rotting Oranges Algorithms Easy Python 953 Verifying an Alien Dictionary Algorithms Easy Python 876 Middle of the Linked List Algorithms Easy Python 844 Backspace String Compare Algorithms Easy Python 678 Valid Parenthesis String Algorithms Medium Python 560 Subarray Sum Equals K Algorithms Medium Python 543 Diameter of Binary Tree Algorithms Easy Python 525 Contiguous Array Algorithms Medium Python 283 Move Zeroes Algorithms Easy Python 238 Product of Array Except Self Algorithms Medium Python 206 Reverse Linked List Algorithms Easy Python 202 Happy Number Algorithms Easy Python 201 Bitwise AND of Numbers Range Algorithms Medium Python 200 Number of Islands Algorithms Medium Python 198 House Robber Algorithms Easy Python 155 Min Stack Algorithms Easy Python 146 LRU Cache Algorithms Medium Python 136 Single Number Algorithms Easy Python 124 Binary Tree Maximum Path Sum Algorithms Hard Python 122 Best Time to Buy and Sell Stock II Algorithms Easy Python 121 Best Time to Buy and Sell Stock Algorithms Easy Python 70 Climbing Stairs Algorithms Easy Python 64 Minimum Path Sum Algorithms Medium Python 55 Jump Game Algorithms Medium Python 53 Maximum Subarrary Algorithms Easy Python 49 Group Anagrams Algorithms Medium Python 33 Search in Rotated Sorted Array Algorithms Medium Python 21 Merge Two Sorted Lists Algorithms Easy Python 20 Valid Parentheses Algorithms Easy Python 2 Add Two Numbers Algorithms Medium Python 1 Two Sum Algorithms Easy Python