| 638 | Shopping Offers | Medium |
| 641 | Design Circular Deque | Medium |
| 643 | Maximum Average Subarray I | Easy |
| 645 | Set Mismatch | Easy |
| 646 | Maximum Length of Pair Chain | Medium |
| 648 | Replace Words | Medium |
| 654 | Maximum Binary Tree | Medium |
| 658 | Find K Closest Elements | Medium |
| 659 | Split Array into Consecutive Subsequences | Medium |
| 661 | Image Smoother | Easy |
| 665 | Non-decreasing Array | Medium |
| 667 | Beautiful Arrangement II | Medium |
| 673 | Number of Longest Increasing Subsequence | Medium |
| 674 | Longest Continuous Increasing Subsequence | Easy |
| 675 | Cut Off Trees for Golf Event | Hard |
| 679 | 24 Game | Hard |
| 682 | Baseball Game | Easy |
| 689 | Maximum Sum of 3 Non-Overlapping Subarrays | Hard |
| 691 | Stickers to Spell Word | Hard |
| 695 | Max Area of Island | Medium |
| 697 | Degree of an Array | Easy |
| 698 | Partition to K Equal Sum Subsets | Medium |
| 699 | Falling Squares | Hard |
| 704 | Binary Search | Easy |
| 705 | Design HashSet | Easy |
| 706 | Design HashMap | Easy |
| 713 | Subarray Product Less Than K | Medium |
| 714 | Best Time to Buy and Sell Stock with Transaction Fee | Medium |
| 717 | 1-bit and 2-bit Characters | Easy |
| 718 | Maximum Length of Repeated Subarray | Medium |