| 337. House Robber III | | | Solve | Medium | | |
| 339. Nested List Weight Sum | | | Solve | Medium | | |
| 340. Longest Substring with At Most K Distinct Characters | | | Solve | Medium | | |
| 341. Flatten Nested List Iterator | | | Solve | Medium | | |
| 343. Integer Break | | | Solve | Medium | | |
| 347. Top K Frequent Elements | | | Solve | Medium | | |
| 348. Design Tic-Tac-Toe | | | Solve | Medium | | |
| 353. Design Snake Game | | | Solve | Medium | | |
| 355. Design Twitter | | | Solve | Medium | | |
| 362. Design Hit Counter | | | Solve | Medium | | |
| 366. Find Leaves of Binary Tree | | | Solve | Medium | | |
| 370. Range Addition | | | Solve | Medium | | |
| 373. Find K Pairs with Smallest Sums | | | Solve | Medium | | |
| 377. Combination Sum IV | | | Solve | Medium | | |
| 378. Kth Smallest Element in a Sorted Matrix | | | Solve | Medium | | |
| 379. Design Phone Directory | | | Solve | Medium | | |
| 380. Insert Delete GetRandom O(1) | | | Solve | Medium | | |
| 382. Linked List Random Node | | | Solve | Medium | | |
| 386. Lexicographical Numbers | | | Solve | Medium | | |
| 388. Longest Absolute File Path | | | Solve | Medium | | |
| 394. Decode String | | | Solve | Medium | | |
| 395. Longest Substring with At Least K Repeating Characters | | | Solve | Medium | | |
| 396. Rotate Function | | | Solve | Medium | | |
| 398. Random Pick Index | | | Solve | Medium | | |
| 399. Evaluate Division | | | Solve | Medium | | |
| 402. Remove K Digits | | | Solve | Medium | | |
| 413. Arithmetic Slices | | | Solve | Medium | | |
| 416. Partition Equal Subset Sum | | | Solve | Medium | | |
| 417. Pacific Atlantic Water Flow | | | Solve | Medium | | |
| 419. Battleships in a Board | | | Solve | Medium | | |
| 424. Longest Repeating Character Replacement | | | Solve | Medium | | |
| 426. Convert Binary Search Tree to Sorted Doubly Linked List | | | Solve | Medium | | |
| 430. Flatten a Multilevel Doubly Linked List | | | Solve | Medium | | |
| 433. Minimum Genetic Mutation | | | Solve | Medium | | |
| 435. Non-overlapping Intervals | | | Solve | Medium | | |
| 436. Find Right Interval | | | Solve | Medium | | |
| 438. Find All Anagrams in a String | | | Solve | Medium | | |
| 442. Find All Duplicates in an Array | | | Solve | Medium | | |
| 443. String Compression | | | Solve | Medium | | |
| 445. Add Two Numbers II | | | Solve | Medium | | |
| 449. Serialize and Deserialize BST | | | Solve | Medium | | |
| 450. Delete Node in a BST | | | Solve | Medium | | |
| 451. Sort Characters By Frequency | | | Solve | Medium | | |
| 454. 4Sum II | | | Solve | Medium | | |
| 456. 132 Pattern | | | Solve | Medium | | |
| 468. Validate IP Address | | | Solve | Medium | | |
| 470. Implement Rand10() Using Rand7() | | | Solve | Medium | | |
| 475. Heaters | | | Solve | Medium | | |
| 477. Total Hamming Distance | | | Solve | Medium | | |
| 486. Predict the Winner | | | Solve | Medium | | |
