| 323. Number of Connected Components in an Undirected Graph | Solution | Solve | Medium | | |
| 325. Maximum Size Subarray Sum Equals k | Solution | Solve | Medium | | |
| 333. Largest BST Subtree | Solution | Solve | Medium | | |
| 339. Nested List Weight Sum | Solution | Solve | Medium | | |
| 340. Longest Substring with At Most K Distinct Characters | Solution | Solve | Medium | | |
| 346. Moving Average from Data Stream | Solution | Solve | Easy | | |
| 348. Design Tic-Tac-Toe | Solution | Solve | Medium | | |
| 351. Android Unlock Patterns | Solution | Solve | Medium | | |
| 353. Design Snake Game | Solution | Solve | Medium | | |
| 356. Line Reflection | Solution | Solve | Medium | | |
| 358. Rearrange String k Distance Apart | Solution | Solve | Hard | | |
| 359. Logger Rate Limiter | Solution | Solve | Easy | | |
| 360. Sort Transformed Array | Solution | Solve | Medium | | |
| 361. Bomb Enemy | Solution | Solve | Medium | | |
| 362. Design Hit Counter | Solution | Solve | Medium | | |
| 364. Nested List Weight Sum II | Solution | Solve | Medium | | |
| 366. Find Leaves of Binary Tree | Solution | Solve | Medium | | |
| 369. Plus One Linked List | Solution | Solve | Medium | | |
| 370. Range Addition | Solution | Solve | Medium | | |
| 379. Design Phone Directory | Solution | Solve | Medium | | |
| 408. Valid Word Abbreviation | Solution | Solve | Easy | | |
| 411. Minimum Unique Word Abbreviation | Solution | Solve | Hard | | |
| 418. Sentence Screen Fitting | Solution | Solve | Medium | | |
| 422. Valid Word Square | Solution | Solve | Easy | | |
| 425. Word Squares | Solution | Solve | Hard | | |
| 426. Convert Binary Search Tree to Sorted Doubly Linked List | Solution | Solve | Medium | | |
| 428. Serialize and Deserialize N-ary Tree | Solution | Solve | Hard | | |
| 431. Encode N-ary Tree to Binary Tree | Solution | Solve | Hard | - | |
| 439. Ternary Expression Parser | Solution | Solve | Medium | | |
| 444. Sequence Reconstruction | Solution | Solve | Medium | | |
| 465. Optimal Account Balancing | Solution | Solve | Hard | | |
| 469. Convex Polygon | Solution | Solve | Medium | | |
| 471. Encode String with Shortest Length | Solution | Solve | Hard | | |
| 484. Find Permutation | Solution | Solve | Medium | | |
| 487. Max Consecutive Ones II | Solution | Solve | Medium | | |
| 489. Robot Room Cleaner | Solution | Solve | Hard | | |
| 490. The Maze | Solution | Solve | Medium | | |
| 499. The Maze III | Solution | Solve | Hard | | |
| 505. The Maze II | Solution | Solve | Medium | | |
| 510. Inorder Successor in BST II | Solution | Solve | Medium | | |
| 512. Game Play Analysis II | Solution | Solve | Easy | | |
| 527. Word Abbreviation | Solution | Solve | Hard | | |
| 531. Lonely Pixel I | Solution | Solve | Medium | | |
| 533. Lonely Pixel II | Solution | Solve | Medium | | |
| 534. Game Play Analysis III | Solution | Solve | Medium | | |
| 536. Construct Binary Tree from String | Solution | Solve | Medium | | |
| 544. Output Contest Matches | Solution | Solve | Medium | | |
| 545. Boundary of Binary Tree | Solution | Solve | Medium | | |
| 548. Split Array with Equal Sum | Solution | Solve | Hard | | |
| 549. Binary Tree Longest Consecutive Sequence II | Solution | Solve | Medium | | |
