| 547 | Friend Circles | Medium |
| 553 | Optimal Division | Medium |
| 554 | Brick Wall | Medium |
| 556 | Next Greater Element III | Medium |
| 558 | Logical OR of Two Binary Grids Represented as Quad-Trees | Medium |
| 560 | Subarray Sum Equals K | Medium |
| 565 | Array Nesting | Medium |
| 567 | Permutation in String | Medium |
| 576 | Out of Boundary Paths | Medium |
| 581 | Shortest Unsorted Continuous Subarray | Medium |
| 583 | Delete Operation for Two Strings | Medium |
| 592 | Fraction Addition and Subtraction | Medium |
| 593 | Valid Square | Medium |
| 608 | Tree Node | Medium |
| 609 | Find Duplicate File in System | Medium |
| 611 | Valid Triangle Number | Medium |
| 621 | Task Scheduler | Medium |
| 622 | Design Circular Queue | Medium |
| 623 | Add One Row to Tree | Medium |
| 626 | Exchange Seats | Medium |
| 633 | Sum of Square Numbers | Medium |
| 636 | Exclusive Time of Functions | Medium |
| 638 | Shopping Offers | Medium |
| 640 | Solve the Equation | Medium |
| 641 | Design Circular Deque | Medium |
| 646 | Maximum Length of Pair Chain | Medium |
| 647 | Palindromic Substrings | Medium |
| 648 | Replace Words | Medium |
| 649 | Dota2 Senate | Medium |
| 650 | 2 Keys Keyboard | Medium |