| 514 | Freedom Trail | Hard |
| 515 | Find Largest Value in Each Tree Row | Medium |
| 516 | Longest Palindromic Subsequence | Medium |
| 517 | Super Washing Machines | Hard |
| 518 | Coin Change 2 | Medium |
| 519 | Random Flip Matrix | Medium |
| 520 | Detect Capital | Easy |
| 521 | Longest Uncommon Subsequence I | Easy |
| 522 | Longest Uncommon Subsequence II | Medium |
| 523 | Continuous Subarray Sum | Medium |
| 524 | Longest Word in Dictionary through Deleting | Medium |
| 525 | Contiguous Array | Medium |
| 526 | Beautiful Arrangement | Medium |
| 528 | Random Pick with Weight | Medium |
| 529 | Minesweeper | Medium |
| 530 | Minimum Absolute Difference in BST | Easy |
| 532 | K-diff Pairs in an Array | Medium |
| 535 | Encode and Decode TinyURL | Medium |
| 537 | Complex Number Multiplication | Medium |
| 538 | Convert BST to Greater Tree | Medium |
| 539 | Minimum Time Difference | Medium |
| 540 | Single Element in a Sorted Array | Medium |
| 541 | Reverse String II | Easy |
| 542 | 01 Matrix | Medium |
| 543 | Diameter of Binary Tree | Easy |
| 546 | Remove Boxes | Hard |
| 547 | Friend Circles | Medium |
| 551 | Student Attendance Record I | Easy |
| 552 | Student Attendance Record II | Hard |
| 553 | Optimal Division | Medium |