| 7. Reverse Integer | | | Solve | Medium | - | |
| 371. Sum of Two Integers | | | Solve | Medium | - | |
| 268. Missing Number | | | Solve | Easy | - | |
| 190. Reverse Bits | | | Solve | Easy | - | |
| 338. Counting Bits | | | Solve | Easy | - | |
| 191. Number of 1 Bits | | | Solve | Easy | - | |
| 136. Single Number | | | Solve | Easy | - | |
| 2013. Detect Squares | | | Solve | Medium | - | |
| 43. Multiply Strings | | | Solve | Medium | - | |
| 50. Pow(x, n) | | | Solve | Medium | - | |
| 66. Plus One | | | Solve | Easy | - | |
| 202. Happy Number | | | Solve | Easy | - | |
| 73. Set Matrix Zeroes | | | Solve | Medium | - | |
| 54. Spiral Matrix | | | Solve | Medium | - | |
| 48. Rotate Image | | | Solve | Medium | - | |
| 1851. Minimum Interval to Include Each Query | | | Solve | Hard | - | |
| 253. Meeting Rooms II | | | Solve | Medium | - | |
| 252. Meeting Rooms | | | Solve | Easy | - | |
| 435. Non-overlapping Intervals | | | Solve | Medium | - | |
| 56. Merge Intervals | | | Solve | Medium | - | |
| 57. Insert Interval | | | Solve | Medium | - | |
| 678. Valid Parenthesis String | | | Solve | Medium | - | |
| 763. Partition Labels | | | Solve | Medium | - | |
| 1899. Merge Triplets to Form Target Triplet | | | Solve | Medium | - | |
| 846. Hand of Straights | | | Solve | Medium | - | |
| 134. Gas Station | | | Solve | Medium | - | |
| 45. Jump Game II | | | Solve | Medium | - | |
| 55. Jump Game | | | Solve | Medium | - | |
| 53. Maximum Subarray | | | Solve | Medium | - | |
| 10. Regular Expression Matching | | | Solve | Hard | - | |
| 312. Burst Balloons | | | Solve | Hard | - | |
| 72. Edit Distance | | | Solve | Medium | - | |
| 115. Distinct Subsequences | | | Solve | Hard | - | |
| 329. Longest Increasing Path in a Matrix | | | Solve | Hard | - | |
| 97. Interleaving String | | | Solve | Medium | - | |
| 494. Target Sum | | | Solve | Medium | - | |
| 518. Coin Change II | | | Solve | Medium | - | |
| 309. Best Time to Buy and Sell Stock with Cooldown | | | Solve | Medium | - | |
| 1143. Longest Common Subsequence | | | Solve | Medium | - | |
| 62. Unique Paths | | | Solve | Medium | - | |
| 416. Partition Equal Subset Sum | | | Solve | Medium | - | |
| 300. Longest Increasing Subsequence | | | Solve | Medium | - | |
| 139. Word Break | | | Solve | Medium | - | |
| 152. Maximum Product Subarray | | | Solve | Medium | - | |
| 322. Coin Change | | | Solve | Medium | - | |
| 91. Decode Ways | | | Solve | Medium | - | |
| 647. Palindromic Substrings | | | Solve | Medium | - | |
| 5. Longest Palindromic Substring | | | Solve | Medium | - | |
| 213. House Robber II | | | Solve | Medium | - | |
| 198. House Robber | | | Solve | Medium | - | |
| 746. Min Cost Climbing Stairs | | | Solve | Easy | - | |
| 70. Climbing Stairs | | | Solve | Easy | - | |
| 787. Cheapest Flights Within K Stops | | | Solve | Medium | - | |
| 269. Alien Dictionary | | | Solve | Hard | - | |
| 778. Swim in Rising Water | | | Solve | Hard | - | |
| 1584. Min Cost to Connect All Points | | | Solve | Medium | - | |
| 332. Reconstruct Itinerary | | | Solve | Hard | - | |
| 743. Network Delay Time | | | Solve | Medium | - | |
| 127. Word Ladder | | | Solve | Hard | - | |
| 684. Redundant Connection | | | Solve | Medium | - | |
| 323. Number of Connected Components in an Undirected Graph | | | Solve | Medium | - | |
| 261. Graph Valid Tree | | | Solve | Medium | - | |
| 210. Course Schedule II | | | Solve | Medium | - | |
| 207. Course Schedule | | | Solve | Medium | - | |
| 130. Surrounded Regions | | | Solve | Medium | - | |
| 417. Pacific Atlantic Water Flow | | | Solve | Medium | - | |
| 994. Rotting Oranges | | | Solve | Medium | - | |
| 286. Walls and Gates | | | Solve | Medium | - | |
| 133. Clone Graph | | | Solve | Medium | - | |
| 695. Max Area of Island | | | Solve | Medium | - | |
| 200. Number of Islands | | | Solve | Medium | - | |
| 212. Word Search II | | | Solve | Hard | - | |
| 211. Design Add and Search Words Data Structure | | | Solve | Medium | - | |
| 208. Implement Trie (Prefix Tree) | | | Solve | Medium | - | |
| 51. N-Queens | | | Solve | Hard | - | |
| 17. Letter Combinations of a Phone Number | | | Solve | Medium | - | |
| 131. Palindrome Partitioning | | | Solve | Medium | - | |
| 79. Word Search | | | Solve | Medium | - | |
| 90. Subsets II | | | Solve | Medium | - | |
| 46. Permutations | | | Solve | Medium | - | |
| 40. Combination Sum II | | | Solve | Medium | - | |
| 39. Combination Sum | | | Solve | Medium | - | |
| 78. Subsets | | | Solve | Medium | - | |
| 295. Find Median from Data Stream | | | Solve | Hard | - | |
| 355. Design Twitter | | | Solve | Medium | - | |
| 621. Task Scheduler | | | Solve | Medium | - | |
| 215. Kth Largest Element in an Array | | | Solve | Medium | - | |
| 973. K Closest Points to Origin | | | Solve | Medium | - | |
| 1046. Last Stone Weight | | | Solve | Easy | - | |
| 703. Kth Largest Element in a Stream | | | Solve | Easy | - | |
| 297. Serialize and Deserialize Binary Tree | | | Solve | Hard | - | |
| 124. Binary Tree Maximum Path Sum | | | Solve | Hard | - | |
| 105. Construct Binary Tree from Preorder and Inorder Traversal | | | Solve | Medium | - | |
| 230. Kth Smallest Element in a BST | | | Solve | Medium | - | |
| 98. Validate Binary Search Tree | | | Solve | Medium | - | |
| 1448. Count Good Nodes in Binary Tree | | | Solve | Medium | - | |
| 199. Binary Tree Right Side View | | | Solve | Medium | - | |
| 102. Binary Tree Level Order Traversal | | | Solve | Medium | - | |
| 235. Lowest Common Ancestor of a Binary Search Tree | | | Solve | Medium | - | |
| 572. Subtree of Another Tree | | | Solve | Easy | - | |
