| 3. Longest Substring Without Repeating Characters | | | Solve | Medium | | |
| 4. Median of Two Sorted Arrays | | | Solve | Hard | | |
| 15. 3Sum | | | Solve | Medium | | |
| 17. Letter Combinations of a Phone Number | | | Solve | Medium | | |
| 20. Valid Parentheses | | | Solve | Easy | | |
| 23. Merge k Sorted Lists | | | Solve | Hard | | |
| 26. Remove Duplicates from Sorted Array | | | Solve | Easy | | |
| 32. Longest Valid Parentheses | | | Solve | Hard | | |
| 33. Search in Rotated Sorted Array | | | Solve | Medium | | |
| 34. Find First and Last Position of Element in Sorted Array | | | Solve | Medium | | |
| 35. Search Insert Position | | | Solve | Easy | | |
| 46. Permutations | | | Solve | Medium | | |
| 49. Group Anagrams | | | Solve | Medium | | |
| 50. Pow(x, n) | | | Solve | Medium | | |
| 53. Maximum Subarray | | | Solve | Medium | | |
| 56. Merge Intervals | | | Solve | Medium | | |
| 62. Unique Paths | | | Solve | Medium | | |
| 63. Unique Paths II | | | Solve | Medium | | |
| 75. Sort Colors | | | Solve | Medium | | |
| 98. Validate Binary Search Tree | | | Solve | Medium | | |
| 121. Best Time to Buy and Sell Stock | | | Solve | Easy | | |
| 139. Word Break | | | Solve | Medium | | |
| 141. Linked List Cycle | | | Solve | Easy | 42gearMobilitySystems+131 | |
| 146. LRU Cache | | | Solve | Medium | | |
| 200. Number of Islands | | | Solve | Medium | | |
| 210. Course Schedule II | | | Solve | Medium | | |
| 215. Kth Largest Element in an Array | | | Solve | Medium | | |
| 234. Palindrome Linked List | | | Solve | Easy | | |
| 239. Sliding Window Maximum | | | Solve | Hard | | |
| 255. Verify Preorder Sequence in Binary Search Tree | | | Solve | Medium | | |
| 268. Missing Number | | | Solve | Easy | | |
| 287. Find the Duplicate Number | | | Solve | Medium | | |
| 295. Find Median from Data Stream | | | Solve | Hard | | |
| 300. Longest Increasing Subsequence | | | Solve | Medium | | |
| 358. Rearrange String k Distance Apart | | | Solve | Hard | | |
| 432. All O`one Data Structure | | | Solve | Hard | | |
| 445. Add Two Numbers II | | | Solve | Medium | | |
| 460. LFU Cache | | | Solve | Hard | | |
| 696. Count Binary Substrings | | | Solve | Easy | | |
| 716. Max Stack | | | Solve | Hard | | |
| 746. Min Cost Climbing Stairs | | | Solve | Easy | | |
| 905. Sort Array By Parity | | | Solve | Easy | | |
| 994. Rotting Oranges | | | Solve | Medium | | |
| 1000. Minimum Cost to Merge Stones | | | Solve | Hard | | |
| 1062. Longest Repeating Substring | | | Solve | Medium | | |
| 1091. Shortest Path in Binary Matrix | | | Solve | Medium | | |
| 1228. Missing Number In Arithmetic Progression | | | Solve | Easy | | |
| 1312. Minimum Insertion Steps to Make a String Palindrome | | | Solve | Hard | | |
| 1326. Minimum Number of Taps to Open to Water a Garden | | | Solve | Hard | | |
| 1328. Break a Palindrome | | | Solve | Medium | | |