| 606 | Construct String from Binary Tree | Easy |
| 617 | Merge Two Binary Trees | Easy |
| 623 | Add One Row to Tree | Medium |
| 641 | Design Circular Deque | Medium |
| 645 | Set Mismatch | Easy |
| 646 | Maximum Length of Pair Chain | Medium |
| 649 | Dota2 Senate | Medium |
| 654 | Maximum Binary Tree | Medium |
| 661 | Image Smoother | Easy |
| 669 | Trim a Binary Search Tree | Easy |
| 688 | Knight Probability in Chessboard | Medium |
| 697 | Degree of an Array | Easy |
| 704 | Binary Search | Easy |
| 706 | Design HashMap | Easy |
| 712 | Minimum ASCII Delete Sum for Two Strings | Medium |
| 714 | Best Time to Buy and Sell Stock with Transaction Fee | Medium |
| 725 | Split Linked List in Parts | Medium |
| 735 | Asteroid Collision | Medium |
| 739 | Daily Temperatures | Medium |
| 746 | Min Cost Climbing Stairs | Easy |
| 749 | Shortest Completing Word | Medium |
| 752 | Open the Lock | Medium |
| 779 | K-th Symbol in Grammar | Medium |
| 785 | Is Graph Bipartite? | Medium |
| 787 | Cheapest Flights Within K Stops | Medium |
| 799 | Champagne Tower | Medium |
| 802 | Find Eventual Safe States | Medium |
| 808 | Soup Servings | Medium |
| 815 | Bus Routes | Hard |
| 823 | Binary Trees With Factors | Medium |