LeetCode leetcode First unsolved problem 1038. Binary Search Tree to Greater Sum Tree 😀 1008. Construct Binary Search Tree from Preorder Traversal 😟 894. All Possible Full Binary Trees 😀 980. Unique Paths III 1104. Path In Zigzag Labelled Binary Tree 😟 852. Peak Index in a Mountain Array 😟 1222. Queens That Can Attack the King 😟 979. Distribute Coins in Binary Tree 😟 1111. Maximum Nesting Depth of Two Valid Parentheses Strings 😟 1122. Relative Sort Array 😀 1123. Lowest Common Ancestor of Deepest Leaves 😟 1043. Partition Array for Maximum Sum 😟 1217. Play with Chips 😀 969. Pancake Sorting 😟 695. Max Area of Island 1074. Number of Submatrices That Sum to Target 😟 889. Construct Binary Tree from Preorder and Postorder Traversal 😀 1130. Minimum Cost Tree From Leaf Values 😟 669. Trim a Binary Search Tree 😀 94. Binary Tree Inorder Traversal 😟 877. Stone Game 😟 1140. Stone Game II 😟 1227. Airplane Seat Assignment Probability 😟 647. Palindromic Substrings 😀 983. Minimum Cost For Tickets 😟 1143. Longest Common Subsequence 😀 1072. Flip Columns For Maximum Number of Equal Rows 😀 895. Maximum Frequency Stack 😀 912. Sort an Array 😟 1011. Capacity To Ship Packages Within D Days 😀 167. Two Sum II - Input array is sorted 😀 18. 4Sum 😟 287. Find the Duplicate Number 😀 378. Kth Smallest Element in a Sorted Matrix 😟 15. 3Sum 😟 406. Queue Reconstruction by Height 😀 1247. Minimum Swaps to Make Strings Equal 😟 5. Longest Palindromic Substring 😀 1029. Two City Scheduling 😀 121. Best Time to Buy and Sell Stock 😀 122. Best Time to Buy and Sell Stock II 765. Couples Holding Hands 1284. Minimum Number of Flips to Convert Binary Matrix to Zero Matrix 863. All Nodes Distance K in Binary Tree 847. Shortest Path Visiting All Nodes 986. Interval List Intersections 1004. Max Consecutive Ones III 632. Smallest Range Covering Elements from K Lists 51. N-Queens 1206. Design Skiplist 137. Single Number II 260. Single Number III 75. Sort Colors 76. Minimum Window Substring 959. Regions Cut By Slashes 684. Redundant Connection 133. Clone Graph 399. Evaluate Division