| 814. Binary Tree Pruning | | | Solve | Medium | | |
| 825. Friends Of Appropriate Ages | | | Solve | Medium | | |
| 852. Peak Index in a Mountain Array | | | Solve | Medium | | |
| 856. Score of Parentheses | | | Solve | Medium | | |
| 863. All Nodes Distance K in Binary Tree | | | Solve | Medium | | |
| 865. Smallest Subtree with all the Deepest Nodes | | | Solve | Medium | | |
| 870. Advantage Shuffle | | | Solve | Medium | | |
| 875. Koko Eating Bananas | | | Solve | Medium | | |
| 893. Groups of Special-Equivalent Strings | | | Solve | Medium | | |
| 919. Complete Binary Tree Inserter | | | Solve | Medium | | |
| 921. Minimum Add to Make Parentheses Valid | | | Solve | Medium | | |
| 934. Shortest Bridge | | | Solve | Medium | | |
| 935. Knight Dialer | | | Solve | Medium | | |
| 939. Minimum Area Rectangle | | | Solve | Medium | | |
| 958. Check Completeness of a Binary Tree | | | Solve | Medium | | |
| 973. K Closest Points to Origin | | | Solve | Medium | | |
| 974. Subarray Sums Divisible by K | | | Solve | Medium | | |
| 986. Interval List Intersections | | | Solve | Medium | | |
| 998. Maximum Binary Tree II | | | Solve | Medium | | |
| 1004. Max Consecutive Ones III | | | Solve | Medium | | |
| 1008. Construct Binary Search Tree from Preorder Traversal | | | Solve | Medium | | |
| 1011. Capacity To Ship Packages Within D Days | | | Solve | Medium | | |
| 1026. Maximum Difference Between Node and Ancestor | | | Solve | Medium | | |
| 1029. Two City Scheduling | | | Solve | Medium | | |
| 1033. Moving Stones Until Consecutive | | | Solve | Medium | | |
| 1038. Binary Search Tree to Greater Sum Tree | | | Solve | Medium | | |
| 1040. Moving Stones Until Consecutive II | | | Solve | Medium | | |
| 1048. Longest String Chain | | | Solve | Medium | | |
| 1055. Shortest Way to Form String | | | Solve | Medium | | |
| 1060. Missing Element in Sorted Array | | | Solve | Medium | | |
| 1077. Project Employees III | | | Solve | Medium | | |
| 1091. Shortest Path in Binary Matrix | | | Solve | Medium | | |
| 1094. Car Pooling | | | Solve | Medium | | |
| 1110. Delete Nodes And Return Forest | | | Solve | Medium | | |
| 1120. Maximum Average Subtree | | | Solve | Medium | | |
| 1123. Lowest Common Ancestor of Deepest Leaves | | | Solve | Medium | | |
| 1132. Reported Posts II | | | Solve | Medium | | |
| 1161. Maximum Level Sum of a Binary Tree | | | Solve | Medium | | |
| 1186. Maximum Subarray Sum with One Deletion | | | Solve | Medium | | |
| 1197. Minimum Knight Moves | | | Solve | Medium | | |
| 1209. Remove All Adjacent Duplicates in String II | | | Solve | Medium | | |
| 1218. Longest Arithmetic Subsequence of Given Difference | | | Solve | Medium | | |
| 1236. Web Crawler | | | Solve | Medium | | |
| 1245. Tree Diameter | | | Solve | Medium | | |
| 1249. Minimum Remove to Make Valid Parentheses | | | Solve | Medium | | |
| 1264. Page Recommendations | | | Solve | Medium | | |
| 1265. Print Immutable Linked List in Reverse | | | Solve | Medium | | |
| 1268. Search Suggestions System | | | Solve | Medium | | |
| 1305. All Elements in Two Binary Search Trees | | | Solve | Medium | | |
| 1319. Number of Operations to Make Network Connected | | | Solve | Medium | | |
