| 2. Add Two Numbers | | | Solve | Medium | | |
| 3. Longest Substring Without Repeating Characters | | | Solve | Medium | | |
| 7. Reverse Integer | | | Solve | Medium | | |
| 15. 3Sum | | | Solve | Medium | | |
| 18. 4Sum | | | Solve | Medium | | |
| 29. Divide Two Integers | | | Solve | Medium | | |
| 31. Next Permutation | | | Solve | Medium | | |
| 33. Search in Rotated Sorted Array | | | Solve | Medium | | |
| 46. Permutations | | | Solve | Medium | | |
| 49. Group Anagrams | | | Solve | Medium | | |
| 50. Pow(x, n) | | | Solve | Medium | | |
| 77. Combinations | | | Solve | Medium | | |
| 93. Restore IP Addresses | | | Solve | Medium | | |
| 97. Interleaving String | | | Solve | Medium | | |
| 139. Word Break | | | Solve | Medium | | |
| 146. LRU Cache | | | Solve | Medium | | |
| 161. One Edit Distance | | | Solve | Medium | | |
| 167. Two Sum II - Input Array Is Sorted | | | Solve | Medium | | |
| 176. Second Highest Salary | | | Solve | Medium | | |
| 189. Rotate Array | | | Solve | Medium | | |
| 200. Number of Islands | | | Solve | Medium | | |
| 227. Basic Calculator II | | | Solve | Medium | | |
| 229. Majority Element II | | | Solve | Medium | | |
| 287. Find the Duplicate Number | | | Solve | Medium | | |
| 309. Best Time to Buy and Sell Stock with Cooldown | | | Solve | Medium | | |
| 322. Coin Change | | | Solve | Medium | | |
| 433. Minimum Genetic Mutation | | | Solve | Medium | | |
| 438. Find All Anagrams in a String | | | Solve | Medium | | |
| 445. Add Two Numbers II | | | Solve | Medium | | |
| 491. Non-decreasing Subsequences | | | Solve | Medium | | |
| 503. Next Greater Element II | | | Solve | Medium | | |
| 513. Find Bottom Left Tree Value | | | Solve | Medium | | |
| 570. Managers with at Least 5 Direct Reports | | | Solve | Medium | | |
| 624. Maximum Distance in Arrays | | | Solve | Medium | | |
| 626. Exchange Seats | | | Solve | Medium | | |
| 669. Trim a Binary Search Tree | | | Solve | Medium | | |
| 678. Valid Parenthesis String | | | Solve | Medium | | |
| 692. Top K Frequent Words | | | Solve | Medium | | |
| 797. All Paths From Source to Target | | | Solve | Medium | | |
| 835. Image Overlap | | | Solve | Medium | | |
| 907. Sum of Subarray Minimums | | | Solve | Medium | | |
| 967. Numbers With Same Consecutive Differences | | | Solve | Medium | | |
| 1164. Product Price at a Given Date | | | Solve | Medium | | |
| 1647. Minimum Deletions to Make Character Frequencies Unique | | | Solve | Medium | | |
| 2762. Continuous Subarrays | | | Solve | Medium | | |
