| 490. The Maze | | | Solve | Medium | | |
| 491. Non-decreasing Subsequences | | | Solve | Medium | | |
| 494. Target Sum | | | Solve | Medium | | |
| 503. Next Greater Element II | | | Solve | Medium | | |
| 513. Find Bottom Left Tree Value | | | Solve | Medium | | |
| 515. Find Largest Value in Each Tree Row | | | Solve | Medium | | |
| 516. Longest Palindromic Subsequence | | | Solve | Medium | | |
| 518. Coin Change II | | | Solve | Medium | | |
| 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 | | |
| 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 | | |
| 560. Subarray Sum Equals K | | | Solve | Medium | | |
| 567. Permutation in String | | | Solve | Medium | | |
| 570. Managers with at Least 5 Direct Reports | | | Solve | Medium | | |
| 576. Out of Boundary Paths | | | Solve | Medium | | |
| 581. Shortest Unsorted Continuous Subarray | | | Solve | Medium | | |
| 582. Kill Process | | | Solve | Medium | | |
| 583. Delete Operation for Two Strings | | | Solve | Medium | | |
| 602. Friend Requests II: Who Has the Most Friends | | | Solve | Medium | | |
| 606. Construct String from Binary Tree | | | Solve | Medium | | |
| 611. Valid Triangle Number | | | Solve | Medium | | |
| 621. Task Scheduler | | | Solve | Medium | | |
| 622. Design Circular Queue | | | Solve | Medium | | |
| 623. Add One Row to Tree | | | Solve | Medium | | |
| 626. Exchange Seats | | | Solve | Medium | | |
| 633. Sum of Square Numbers | | | Solve | Medium | | |
| 634. Find the Derangement of An Array | | | Solve | Medium | | |
| 638. Shopping Offers | | | Solve | Medium | | |
| 640. Solve the Equation | | | Solve | Medium | | |
| 646. Maximum Length of Pair Chain | | | Solve | Medium | | |
| 650. 2 Keys Keyboard | | | Solve | Medium | | |
| 652. Find Duplicate Subtrees | | | Solve | Medium | | |
| 654. Maximum Binary Tree | | | Solve | Medium | | |
| 655. Print Binary Tree | | | Solve | Medium | | |
| 658. Find K Closest Elements | | | Solve | Medium | | |
| 662. Maximum Width of Binary Tree | | | Solve | Medium | | |
| 663. Equal Tree Partition | | | Solve | Medium | | |
| 669. Trim a Binary Search Tree | | | Solve | Medium | | |
