| 554 | Brick Wall | Medium |
| 556 | Next Greater Element III | Medium |
| 557 | Reverse Words in a String III | Easy |
| 558 | Logical OR of Two Binary Grids Represented as Quad-Trees | Medium |
| 559 | Maximum Depth of N-ary Tree | Easy |
| 560 | Subarray Sum Equals K | Medium |
| 561 | Array Partition | Easy |
| 563 | Binary Tree Tilt | Easy |
| 564 | Find the Closest Palindrome | Hard |
| 565 | Array Nesting | Medium |
| 566 | Reshape the Matrix | Easy |
| 567 | Permutation in String | Medium |
| 572 | Subtree of Another Tree | Easy |
| 575 | Distribute Candies | Easy |
| 576 | Out of Boundary Paths | Medium |
| 581 | Shortest Unsorted Continuous Subarray | Medium |
| 583 | Delete Operation for Two Strings | Medium |
| 584 | Find Customer Referee | Easy |
| 586 | Customer Placing the Largest Number of Orders | Easy |
| 587 | Erect the Fence | Hard |
| 589 | N-ary Tree Preorder Traversal | Easy |
| 590 | N-ary Tree Postorder Traversal | Easy |
| 591 | Tag Validator | Hard |
| 592 | Fraction Addition and Subtraction | Medium |
| 593 | Valid Square | Medium |
| 594 | Longest Harmonious Subsequence | Easy |
| 595 | Big Countries | Easy |
| 596 | Classes More Than 5 Students | Easy |
| 598 | Range Addition II | Easy |
| 599 | Minimum Index Sum of Two Lists | Easy |