| 518. Coin Change II | | | Solve | Medium | | |
| 520. Detect Capital | | | Solve | Easy | | |
| 523. Continuous Subarray Sum | | | Solve | Medium | | |
| 525. Contiguous Array | | | Solve | Medium | | |
| 528. Random Pick with Weight | | | Solve | Medium | | |
| 529. Minesweeper | | | Solve | Medium | | |
| 532. K-diff Pairs in an Array | | | Solve | Medium | | |
| 535. Encode and Decode TinyURL | | | Solve | Medium | | |
| 537. Complex Number Multiplication | | | Solve | Medium | | |
| 538. Convert BST to Greater Tree | | | Solve | Medium | | |
| 539. Minimum Time Difference | | | Solve | Medium | | |
| 540. Single Element in a Sorted Array | | | Solve | Medium | | |
| 542. 01 Matrix | | | Solve | Medium | | |
| 543. Diameter of Binary Tree | | | Solve | Easy | | |
| 545. Boundary of Binary Tree | | | Solve | Medium | | |
| 547. Number of Provinces | | | Solve | Medium | | |
| 553. Optimal Division | | | Solve | Medium | | |
| 556. Next Greater Element III | | | Solve | Medium | | |
| 557. Reverse Words in a String III | | | Solve | Easy | | |
| 560. Subarray Sum Equals K | | | Solve | Medium | | |
| 561. Array Partition | | | Solve | Easy | | |
| 564. Find the Closest Palindrome | | | Solve | Hard | | |
| 567. Permutation in String | | | Solve | Medium | | |
| 570. Managers with at Least 5 Direct Reports | | | Solve | Medium | | |
| 572. Subtree of Another Tree | | | Solve | Easy | | |
| 576. Out of Boundary Paths | | | Solve | Medium | | |
| 577. Employee Bonus | | | Solve | Easy | | |
| 579. Find Cumulative Salary of an Employee | | | Solve | Hard | | |
| 581. Shortest Unsorted Continuous Subarray | | | Solve | Medium | | |
| 582. Kill Process | | | Solve | Medium | | |
| 583. Delete Operation for Two Strings | | | Solve | Medium | | |
| 584. Find Customer Referee | | | Solve | Easy | | |
| 588. Design In-Memory File System | | | Solve | Hard | | |
| 590. N-ary Tree Postorder Traversal | | | Solve | Easy | | |
| 591. Tag Validator | | | Solve | Hard | | |
| 595. Big Countries | | | Solve | Easy | | |
| 598. Range Addition II | | | Solve | Easy | | |
| 601. Human Traffic of Stadium | | | Solve | Hard | | |
| 602. Friend Requests II: Who Has the Most Friends | | | Solve | Medium | | |
| 603. Consecutive Available Seats | | | Solve | Easy | | |
| 605. Can Place Flowers | | | Solve | Easy | | |
| 606. Construct String from Binary Tree | | | Solve | Medium | | |
| 610. Triangle Judgement | | | Solve | Easy | | |
| 611. Valid Triangle Number | | | Solve | Medium | | |
| 617. Merge Two Binary Trees | | | Solve | Easy | | |
| 618. Students Report By Geography | | | Solve | Hard | | |
| 620. Not Boring Movies | | | Solve | Easy | | |
| 621. Task Scheduler | | | Solve | Medium | | |
| 622. Design Circular Queue | | | Solve | Medium | | |
| 623. Add One Row to Tree | | | Solve | Medium | | |
