| 685 | Redundant Connection II | Hard |
| 686 | Repeated String Match | Medium |
| 687 | Longest Univalue Path | Medium |
| 688 | Knight Probability in Chessboard | Medium |
| 689 | Maximum Sum of 3 Non-Overlapping Subarrays | Hard |
| 690 | Employee Importance | Medium |
| 691 | Stickers to Spell Word | Hard |
| 692 | Top K Frequent Words | Medium |
| 693 | Binary Number with Alternating Bits | Easy |
| 695 | Max Area of Island | Medium |
| 696 | Count Binary Substrings | Easy |
| 697 | Degree of an Array | Easy |
| 698 | Partition to K Equal Sum Subsets | Medium |
| 699 | Falling Squares | Hard |
| 700 | Search in a Binary Search Tree | Easy |
| 701 | Insert into a Binary Search Tree | Medium |
| 703 | Kth Largest Element in a Stream | Easy |
| 704 | Binary Search | Easy |
| 705 | Design HashSet | Easy |
| 706 | Design HashMap | Easy |
| 707 | Design Linked List | Medium |
| 709 | To Lower Case | Easy |
| 710 | Random Pick with Blacklist | Hard |
| 712 | Minimum ASCII Delete Sum for Two Strings | Medium |
| 713 | Subarray Product Less Than K | Medium |
| 714 | Best Time to Buy and Sell Stock with Transaction Fee | Medium |
| 715 | Range Module | Hard |
| 717 | 1-bit and 2-bit Characters | Easy |
| 718 | Maximum Length of Repeated Subarray | Medium |
| 719 | Find K-th Smallest Pair Distance | Hard |