| 286. Walls and Gates | | | Solve | Medium | | |
| 287. Find the Duplicate Number | | | Solve | Medium | | |
| 288. Unique Word Abbreviation | | | Solve | Medium | | |
| 289. Game of Life | | | Solve | Medium | | |
| 294. Flip Game II | | | Solve | Medium | | |
| 298. Binary Tree Longest Consecutive Sequence | | | Solve | Medium | | |
| 299. Bulls and Cows | | | Solve | Medium | | |
| 300. Longest Increasing Subsequence | | | Solve | Medium | | |
| 304. Range Sum Query 2D - Immutable | | | Solve | Medium | | |
| 307. Range Sum Query - Mutable | | | Solve | Medium | | |
| 308. Range Sum Query 2D - Mutable | | | Solve | Medium | | |
| 309. Best Time to Buy and Sell Stock with Cooldown | | | Solve | Medium | | |
| 313. Super Ugly Number | | | Solve | Medium | | |
| 320. Generalized Abbreviation | | | Solve | Medium | | |
| 322. Coin Change | | | Solve | Medium | | |
| 323. Number of Connected Components in an Undirected Graph | | | Solve | Medium | | |
| 331. Verify Preorder Serialization of a Binary Tree | | | Solve | Medium | | |
| 334. Increasing Triplet Subsequence | | | Solve | Medium | | |
| 337. House Robber III | | | 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 | | |
| 368. Largest Divisible Subset | | | Solve | Medium | | |
| 369. Plus One Linked List | | | Solve | Medium | | |
| 375. Guess Number Higher or Lower II | | | Solve | Medium | | |
| 377. Combination Sum IV | | | Solve | Medium | | |
| 378. Kth Smallest Element in a Sorted Matrix | | | Solve | Medium | | |
| 380. Insert Delete GetRandom O(1) | | | Solve | Medium | | |
| 382. Linked List Random Node | | | Solve | Medium | | |
| 384. Shuffle an Array | | | Solve | Medium | | |
| 388. Longest Absolute File Path | | | Solve | Medium | | |
| 394. Decode String | | | Solve | Medium | | |
| 396. Rotate Function | | | Solve | Medium | | |
| 398. Random Pick Index | | | Solve | Medium | | |
| 399. Evaluate Division | | | Solve | Medium | | |
| 402. Remove K Digits | | | Solve | Medium | | |
| 416. Partition Equal Subset Sum | | | Solve | Medium | | |
| 417. Pacific Atlantic Water Flow | | | Solve | Medium | | |
| 418. Sentence Screen Fitting | | | Solve | Medium | | |
| 419. Battleships in a Board | | | Solve | Medium | | |
| 424. Longest Repeating Character Replacement | | | Solve | Medium | | |
| 430. Flatten a Multilevel Doubly Linked List | | | Solve | Medium | | |
| 435. Non-overlapping Intervals | | | Solve | Medium | | |
| 437. Path Sum III | | | Solve | Medium | | |
