| 3. Longest Substring Without Repeating Characters | | | Solve | Medium | | |
| 15. 3Sum | | | Solve | Medium | | |
| 33. Search in Rotated Sorted Array | | | Solve | Medium | | |
| 46. Permutations | | | Solve | Medium | | |
| 49. Group Anagrams | | | Solve | Medium | | |
| 53. Maximum Subarray | | | Solve | Medium | | |
| 54. Spiral Matrix | | | Solve | Medium | | |
| 55. Jump Game | | | Solve | Medium | | |
| 56. Merge Intervals | | | Solve | Medium | | |
| 62. Unique Paths | | | Solve | Medium | | |
| 74. Search a 2D Matrix | | | Solve | Medium | | |
| 75. Sort Colors | | | Solve | Medium | | |
| 92. Reverse Linked List II | | | Solve | Medium | | |
| 97. Interleaving String | | | Solve | Medium | | |
| 114. Flatten Binary Tree to Linked List | | | Solve | Medium | | |
| 116. Populating Next Right Pointers in Each Node | | | Solve | Medium | | |
| 139. Word Break | | | Solve | Medium | | |
| 146. LRU Cache | | | Solve | Medium | | |
| 155. Min Stack | | | Solve | Medium | | |
| 173. Binary Search Tree Iterator | | | Solve | Medium | | |
| 179. Largest Number | | | Solve | Medium | | |
| 189. Rotate Array | | | Solve | Medium | | |
| 200. Number of Islands | | | Solve | Medium | | |
| 210. Course Schedule II | | | Solve | Medium | | |
| 215. Kth Largest Element in an Array | | | Solve | Medium | | |
| 221. Maximal Square | | | Solve | Medium | | |
| 316. Remove Duplicate Letters | | | Solve | Medium | | |
| 341. Flatten Nested List Iterator | | | Solve | Medium | | |
| 417. Pacific Atlantic Water Flow | | | Solve | Medium | | |
| 739. Daily Temperatures | | | Solve | Medium | | |
| 855. Exam Room | | | Solve | Medium | | |
| 865. Smallest Subtree with all the Deepest Nodes | | | Solve | Medium | | |
| 881. Boats to Save People | | | Solve | Medium | | |
| 1011. Capacity To Ship Packages Within D Days | | | Solve | Medium | | |
| 1283. Find the Smallest Divisor Given a Threshold | | | Solve | Medium | | |
| 1319. Number of Operations to Make Network Connected | | | Solve | Medium | | |
| 1353. Maximum Number of Events That Can Be Attended | | | Solve | Medium | | |
| 1443. Minimum Time to Collect All Apples in a Tree | | | Solve | Medium | | |
| 1448. Count Good Nodes in Binary Tree | | | Solve | Medium | | |
| 1481. Least Number of Unique Integers after K Removals | | | Solve | Medium | | |
| 1641. Count Sorted Vowel Strings | | | Solve | Medium | | |
| 1701. Average Waiting Time | | | Solve | Medium | | |
| 1718. Construct the Lexicographically Largest Valid Sequence | | | Solve | Medium | | |
| 2563. Count the Number of Fair Pairs | | | Solve | Medium | | |
| 2865. Beautiful Towers I | | | Solve | Medium | | |
| 2866. Beautiful Towers II | | | Solve | Medium | | |
| 2957. Remove Adjacent Almost-Equal Characters | | | Solve | Medium | | |
