| 377 | Combination Sum IV | Medium |
| 380 | Insert Delete GetRandom O(1) | Medium |
| 445 | Add Two Numbers II | Medium |
| 454 | 4Sum II | Medium |
| 456 | 132 Pattern | Medium |
| 478 | Generate Random Point in a Circle | Medium |
| 486 | Predict the Winner | Medium |
| 503 | Next Greater Element II | Medium |
| 513 | Find Bottom Left Tree Value | Medium |
| 515 | Find Largest Value in Each Tree Row | Medium |
| 516 | Longest Palindromic Subsequence | Medium |
| 518 | Coin Change II | Medium |
| 525 | Contiguous Array | Medium |
| 537 | Complex Number Multiplication | Medium |
| 542 | 01 Matrix | Medium |
| 547 | Friend Circles | Medium |
| 556 | Next Greater Element III | Medium |
| 560 | Subarray Sum Equals K | Medium |
| 576 | Out of Boundary Paths | Medium |
| 623 | Add One Row to Tree | Medium |
| 641 | Design Circular Deque | Medium |
| 646 | Maximum Length of Pair Chain | Medium |
| 649 | Dota2 Senate | Medium |
| 654 | Maximum Binary Tree | Medium |
| 688 | Knight Probability in Chessboard | Medium |
| 712 | Minimum ASCII Delete Sum for Two Strings | Medium |
| 714 | Best Time to Buy and Sell Stock with Transaction Fee | Medium |
| 725 | Split Linked List in Parts | Medium |
| 735 | Asteroid Collision | Medium |
| 739 | Daily Temperatures | Medium |