| 686 | Repeated String Match | StringString Matching | Medium |
| 687 | Longest Univalue Path | TreeDepth-First SearchBinary Tree | Medium |
| 688 | Knight Probability in Chessboard | Dynamic Programming | Medium |
| 689 | Maximum Sum of 3 Non-Overlapping Subarrays | ArrayDynamic ProgrammingSliding Window+1 | Hard |
| 690 | Employee Importance | ArrayHash TableTree+2 | Medium |
| 691 | Stickers to Spell Word | ArrayHash TableString+5 | Hard |
| 692 | Top K Frequent Words | ArrayHash TableString+5 | Medium |
| 693 | Binary Number with Alternating Bits | Bit Manipulation | Easy |
| 695 | Max Area of Island | ArrayDepth-First SearchBreadth-First Search+2 | Medium |
| 696 | Count Binary Substrings | Two PointersString | Easy |
| 697 | Degree of an Array | ArrayHash Table | Easy |
| 698 | Partition to K Equal Sum Subsets | ArrayDynamic ProgrammingBacktracking+3 | Medium |
| 699 | Falling Squares | ArraySegment TreeOrdered Set | Hard |
| 700 | Search in a Binary Search Tree | TreeBinary Search TreeBinary Tree | Easy |
| 701 | Insert into a Binary Search Tree | TreeBinary Search TreeBinary Tree | Medium |
| 703 | Kth Largest Element in a Stream | TreeDesignBinary Search Tree+3 | Easy |
| 704 | Binary Search | ArrayBinary Search | Easy |
| 705 | Design HashSet | ArrayHash TableLinked List+2 | Easy |
| 706 | Design HashMap | ArrayHash TableLinked List+2 | Easy |
| 707 | Design Linked List | Linked ListDesign | Medium |
| 709 | To Lower Case | String | Easy |
| 710 | Random Pick with Blacklist | ArrayHash TableMath+3 | Hard |
| 712 | Minimum ASCII Delete Sum for Two Strings | StringDynamic Programming | Medium |
| 713 | Subarray Product Less Than K | ArrayBinary SearchSliding Window+1 | Medium |
| 714 | Best Time to Buy and Sell Stock with Transaction Fee | ArrayDynamic ProgrammingGreedy | Medium |
| 715 | Range Module | DesignSegment TreeOrdered Set | Hard |
| 717 | 1-bit and 2-bit Characters | Array | Easy |
| 718 | Maximum Length of Repeated Subarray | ArrayBinary SearchDynamic Programming+3 | Medium |
| 719 | Find K-th Smallest Pair Distance | ArrayTwo PointersBinary Search+1 | Hard |
| 720 | Longest Word in Dictionary | ArrayHash TableString+2 | Medium |
| 721 | Accounts Merge | ArrayHash TableString+4 | Medium |
| 722 | Remove Comments | ArrayString | Medium |
| 724 | Find Pivot Index | ArrayPrefix Sum | Easy |
| 725 | Split Linked List in Parts | Linked List | Medium |
| 726 | Number of Atoms | Hash TableStringStack+1 | Hard |
| 728 | Self Dividing Numbers | Math | Easy |
| 729 | My Calendar I | ArrayBinary SearchDesign+2 | Medium |
| 730 | Count Different Palindromic Subsequences | StringDynamic Programming | Hard |
| 731 | My Calendar II | ArrayBinary SearchDesign+3 | Medium |
| 732 | My Calendar III | Binary SearchDesignSegment Tree+2 | Hard |
| 733 | Flood Fill | ArrayDepth-First SearchBreadth-First Search+1 | Easy |
| 735 | Asteroid Collision | ArrayStackSimulation | Medium |
| 736 | Parse Lisp Expression | Hash TableStringStack+1 | Hard |
| 738 | Monotone Increasing Digits | MathGreedy | Medium |
| 739 | Daily Temperatures | ArrayStackMonotonic Stack | Medium |
| 740 | Delete and Earn | ArrayHash TableDynamic Programming | Medium |
| 741 | Cherry Pickup | ArrayDynamic ProgrammingMatrix | Hard |
| 743 | Network Delay Time | Depth-First SearchBreadth-First SearchGraph+2 | Medium |
| 744 | Find Smallest Letter Greater Than Target | ArrayBinary Search | Easy |
| 745 | Prefix and Suffix Search | ArrayHash TableString+2 | Hard |