| 523. Continuous Subarray Sum | Solution | Solve | Medium | | |
| 524. Longest Word in Dictionary through Deleting | Solution | Solve | Medium | | |
| 525. Contiguous Array | Solution | Solve | Medium | | |
| 526. Beautiful Arrangement | Solution | Solve | Medium | | |
| 528. Random Pick with Weight | Solution | Solve | Medium | | |
| 529. Minesweeper | Solution | Solve | Medium | | |
| 531. Lonely Pixel I | Solution | Solve | Medium | | |
| 532. K-diff Pairs in an Array | Solution | Solve | Medium | | |
| 533. Lonely Pixel II | Solution | Solve | Medium | | |
| 534. Game Play Analysis III | Solution | Solve | Medium | | |
| 535. Encode and Decode TinyURL | Solution | Solve | Medium | | |
| 536. Construct Binary Tree from String | Solution | Solve | Medium | | |
| 537. Complex Number Multiplication | Solution | Solve | Medium | | |
| 538. Convert BST to Greater Tree | Solution | Solve | Medium | | |
| 539. Minimum Time Difference | Solution | Solve | Medium | | |
| 540. Single Element in a Sorted Array | Solution | Solve | Medium | | |
| 542. 01 Matrix | Solution | Solve | Medium | | |
| 544. Output Contest Matches | Solution | Solve | Medium | | |
| 545. Boundary of Binary Tree | Solution | Solve | Medium | | |
| 547. Number of Provinces | Solution | Solve | Medium | | |
| 549. Binary Tree Longest Consecutive Sequence II | Solution | Solve | Medium | | |
| 550. Game Play Analysis IV | Solution | Solve | Medium | | |
| 553. Optimal Division | Solution | Solve | Medium | | |
| 554. Brick Wall | Solution | Solve | Medium | | |
| 555. Split Concatenated Strings | Solution | Solve | Medium | | |
| 556. Next Greater Element III | Solution | Solve | Medium | | |
| 558. Logical OR of Two Binary Grids Represented as Quad-Trees | Solution | Solve | Medium | - | |
| 560. Subarray Sum Equals K | Solution | Solve | Medium | | |
| 562. Longest Line of Consecutive One in Matrix | Solution | Solve | Medium | | |
| 565. Array Nesting | Solution | Solve | Medium | | |
| 567. Permutation in String | Solution | Solve | Medium | | |
| 570. Managers with at Least 5 Direct Reports | Solution | Solve | Medium | | |
| 573. Squirrel Simulation | Solution | Solve | Medium | | |
| 574. Winning Candidate | Solution | Solve | Medium | - | |
| 576. Out of Boundary Paths | Solution | Solve | Medium | | |
| 578. Get Highest Answer Rate Question | Solution | Solve | Medium | | |
| 580. Count Student Number in Departments | Solution | Solve | Medium | | |
| 581. Shortest Unsorted Continuous Subarray | Solution | Solve | Medium | | |
| 582. Kill Process | Solution | Solve | Medium | | |
| 583. Delete Operation for Two Strings | Solution | Solve | Medium | | |
| 585. Investments in 2016 | Solution | Solve | Medium | | |
| 592. Fraction Addition and Subtraction | Solution | Solve | Medium | | |
| 593. Valid Square | Solution | Solve | Medium | | |
| 602. Friend Requests II: Who Has the Most Friends | Solution | Solve | Medium | | |
| 606. Construct String from Binary Tree | Solution | Solve | Medium | | |
| 608. Tree Node | Solution | Solve | Medium | | |
| 609. Find Duplicate File in System | Solution | Solve | Medium | | |
| 611. Valid Triangle Number | Solution | Solve | Medium | | |
| 612. Shortest Distance in a Plane | Solution | Solve | Medium | | |
| 614. Second Degree Follower | Solution | Solve | Medium | - | |
