('$' means the problem is locked on Leetcode, '*' means the problem is related to Database, '#' means the problem is related to Shell.)
| # | Title | Solution | Difficulty |
|---|---|---|---|
| 700 | Search in a Binary Search Tree | 62.70% | Easy |
| 699 | Falling Squares | 36.80% | Hard |
| 698 | Partition to K Equal Sum Subsets | 35.60% | Medium |
| 697 | Degree of an Array | 47.90% | Easy |
| 696 | Count Binary Substrings | 51.90% | Easy |
| 695 | Max Area of Island | 53.30% | Easy |
| 694 | Number of Distinct Islands $ | 43.90% | Medium |
| 693 | Binary Number with Alternating Bits | 54.20% | Easy |
| 692 | Top K Frequent Words | 41.70% | Medium |
| 691 | Stickers to Spell Word | 32.30% | Hard |
| 690 | Employee Importance | 53.60% | Easy |
| 689 | Maximum Sum of 3 Non-Overlapping Subarrays | 41.70% | Hard |
| 688 | Knight Probability in Chessboard | 38.90% | Medium |
| 687 | Longest Univalue Path | 32.90% | Easy |
| 686 | Repeated String Match | 31.70% | Easy |
| 685 | Redundant Connection II | 28.40% | Hard |
| 684 | Redundant Connection | 37.40% | Medium |
| 683 | K Empty Slots | 37.00% | Hard |
| 682 | Baseball Game | 58.60% | Easy |
| 681 | Next Closest Time $ | 43.00% | Medium |
| 680 | Valid Palindrome II | 31.10% | Easy |
| 679 | 24 Game | 38.30% | Hard |
| 678 | Valid Parenthesis String | 28.30% | Medium |
| 677 | Map Sum Pairs | 53.80% | Medium |
| 676 | Implement Magic Dictionary | 50.70% | Medium |
| 675 | Cut Off Trees for Golf Event | 27.20% | Hard |
| 674 | Longest Continuous Increasing Subsequence | 43.20% | Easy |
| 673 | Number of Longest Increasing Subsequence | 30.80% | Medium |
| 672 | Bulb Switcher II | 47.60% | Medium |
| 671 | Second Minimum Node In a Binary Tree | 42.30% | Easy |
| 670 | Maximum Swap | 38.40% | Medium |
| 669 | Trim a Binary Search Tree | 58.70% | Easy |
| 668 | Kth Smallest Number in Multiplication Table | 36.30% | Hard |
| 667 | Beautiful Arrangement II | 51.50% | Medium |
| 666 | Path Sum IV $ | 48.90% | Medium |
| 665 | Non-decreasing Array | 21.20% | Easy |
| 664 | Strange Printer | 31.10% | Hard |
| 663 | Equal Tree Partition $ | 36.70% | Medium |
| 662 | Maximum Width of Binary Tree | 37.00% | Medium |
| 661 | Image Smoother | 46.60% | Easy |
| 660 | Remove 9 $ | 46.10% | Hard |
| 659 | Split Array into Consecutive Subsequences | 39.40% | Medium |
| 658 | Find K Closest Elements | 36.30% | Medium |
| 657 | Judge Route Circle | 69.30% | Easy |
| 656 | Coin Path $ | 24.60% | Hard |
| 655 | Print Binary Tree | 50.80% | Medium |
| 654 | Maximum Binary Tree | 70.80% | Medium |
| 653 | Two Sum IV - Input is a BST | 50.60% | Easy |
| 652 | Find Duplicate Subtrees | 33.20% | Medium |
| 651 | 4 Keys Keyboard $ | 46.70% | Medium |
| 650 | 2 Keys Keyboard | 42.70% | Medium |
| 649 | Dota2 Senate | 35.60% | Medium |
| 648 | Replace Words | 48.40% | Medium |
| 647 | Palindromic Substrings | 55.70% | Medium |
| 646 | Maximum Length of Pair Chain | 47.40% | Medium |
| 645 | Set Mismatch | 40.40% | Easy |
| 644 | Maximum Average Subarray II $ | 20.30% | Hard |
| 643 | Maximum Average Subarray I | 38.40% | Easy |
| 642 | Design Search Autocomplete System $ | 29.40% | Hard |
| 641 | Design Circular Deque | 48.00% | Medium |
| 640 | Solve the Equation | 39.00% | Medium |
| 639 | Decode Ways II | 22.80% | Hard |
| 638 | Shopping Offers | 41.50% | Medium |
| 637 | Average of Levels in Binary Tree | 55.60% | Easy |
| 636 | Exclusive Time of Functions | 40.30% | Medium |
| 635 | Design Log Storage System $ | 47.70% | Medium |
| 634 | Find the Derangement of An Array $ | 32.70% | Medium |
| 633 | Sum of Square Numbers | 31.60% | Easy |
| 632 | Smallest Range | 42.80% | Hard |
| 631 | Design Excel Sum Formula $ | 25.60% | Hard |
| 630 | Course Schedule III | 20.50% | Medium |
| 629 | K Inverse Pairs Array | 23.90% | Hard |
| 628 | Maximum Product of Three Numbers | 45.40% | Easy |
| 627 | Swap Salary | 67.40% | Easy |
| 626 | Exchange Seats | 49.60% | Medium |
| 625 | Minimum Factorization | 29.50% | Medium |
| 624 | Maximum Distance in Arrays $ | 32.70% | Easy |
| 623 | Add One Row to Tree | 48.70% | Medium |
| 622 | Design Circular Queue | 36.60% | Medium |
| 621 | Task Scheduler | 41.40% | Medium |
| 620 | Not Boring Movies | 59.80% | Easy |
| 619 | Biggest Single Number $ | 36.60% | Easy |
| 618 | Students Report By Geography $ | 40.40% | Hard |
| 617 | Merge Two Binary Trees | 69.60% | Easy |
| 616 | Add Bold Tag in String $ | 37.30% | Medium |
| 615 | Average Salary: Departments VS Company $ | 33.00% | Hard |
| 614 | Second Degree Follower $ | 22.70% | Medium |
| 613 | Shortest Distance in a Line $ | 70.60% | Easy |
| 612 | Shortest Distance in a Plane $ | 51.00% | Medium |
| 611 | Valid Triangle Number | 38.90% | Medium |
| 610 | Triangle Judgement $ | 59.10% | Easy |
| 609 | Find Duplicate File in System | 52.50% | Medium |
| 608 | Tree Node $ | 54.60% | Medium |
| 607 | Sales Person $ | 51.10% | Easy |
| 606 | Construct String from Binary Tree | 51.80% | Easy |
| 605 | Can Place Flowers | 30.00% | Easy |
| 604 | Design Compressed String Iterator $ | 31.60% | Easy |
| 603 | Consecutive Available Seats $ | 54.50% | Easy |
| 602 | Friend Requests II: Who Has the Most Friends $ | 42.50% | Medium |
| 601 | Human Traffic of Stadium | 33.80% | Hard |