LeetCode All in One 题目讲解汇总(持续更新中...)

原文地址:https://www.cnblogs.com/grandyang/p/4606334.html

终于将LeetCode的大部分题刷完了,真是漫长的第一遍啊,估计很多题都忘的差不多了,这次开个题目汇总贴,并附上每道题目的解题连接,方便之后查阅吧~

如果各位看官们,大神们发现了任何错误,或是代码无法通过OJ,或是有更好的解法,或是有任何疑问,意见和建议的话,请一定要在对应的帖子下面评论区留言告知博主啊(如果不方便注册博客园的话,可以下载下文提到的APP,在Feedback中给博主发邮件交流哈),同时也请大家踊跃地,大量地,盲目地提供各个题目的follow up一起讨论哈,多谢多谢,祝大家刷得愉快,刷得精彩,刷出美好未来~

博主制作了一款iOS的应用"Leetcode Meet Me",里面有Leetcode上所有的题目,并且贴上了博主的解法,随时随地都能看啊,相当方便,而且无网状态下也能看哦~目前只支持iPhone和iPad,直接在App Store搜"Leetcode Meet Me"就可以找到,关于本app有任何的feedback请直接在本帖的评论区留言帮助博主改进,demo展示请参见帖子的底部~ (同时征安卓大神帮忙制作安卓版的应用)。

同时请大家关注博主的微信公众号刷尽天下】,可以通过搜索公众号【shua2sum】来添加,或者扫右边侧栏或者帖子底部的二维码关注,使用方法也请参见本帖底部。

喜欢本博客的朋友们可以点击右边的浮窗或者帖子底部的二维码进行打赏,不管大家是物质打赏(比如扫码发红包,大家打赏时请留下微信号哦,可以跟博主加为好友哈,可以通过在付款方留言中留下你的微信号,或者在博客中通过站内信发来你的微信号~),还是精神打赏(留言和点赞),博主都感激万分,这也是博主一直坚持下去的动力~

 

880 Decoded String at Index 23.00% Medium
879 Profitable Schemes 36.20% Hard
878 Nth Magical Number  25.40% Hard
877 Stone Game  61.10% Medium
876 Middle of the Linked List  63.80% Easy
875 Koko Eating Bananas  45.90% Medium
874 Walking Robot Simulation  31.70% Easy
873 Length of Longest Fibonacci Subsequence  46.00% Medium
872 Leaf-Similar Trees  63.10% Easy
871 Minimum Number of Refueling Stops  28.70% Hard
870 Advantage Shuffle  42.20% Medium
869 Reordered Power of 2  50.60% Medium
868 Binary Gap 59.30% Easy
867 Transpose Matrix  63.90% Easy
866 Prime Palindrome   20.00% Medium
865 Smallest Subtree with all the Deepest Nodes 55.40% Medium
864 Shortest Path to Get All Keys  35.70% Hard
863 All Nodes Distance K in Binary Tree  46.80% Medium
862 Shortest Subarray with Sum at Least K  22.00% Hard
861 Score After Flipping Matrix 69.30% Medium
860 Lemonade Change 50.20% Easy
859 Buddy Strings 27.60% Easy
858 Mirror Reflection 52.00% Medium
857 Minimum Cost to Hire K Workers 47.30% Hard
856 Score of Parentheses  55.90% Medium
855 Exam Room 38.10% Medium
854 K-Similar Strings 33.20% Hard
853 Car Fleet   39.30% Medium
852 Peak Index in a Mountain Array   68.50% Easy
851 Loud and Rich     47.40% Medium
850 Rectangle Area II  44.00% Hard
849 Maximize Distance to Closest Person 40.40% Easy
848 Shifting Letters  39.90% Medium
847 Shortest Path Visiting All Nodes   45.90% Hard
846 Hand of Straights 48.60% Medium
845 Longest Mountain in Array 34.00% Medium
844 Backspace String Compare 45.50% Easy
843 Guess the Word   42.60% Hard
842 Split Array into Fibonacci Sequence 34.60% Medium
841 Keys and Rooms 59.70% Medium
840 Magic Squares In Grid 35.10% Easy
839 Similar String Groups 33.50% Hard
838 Push Dominoes 42.80% Medium
837 New 21 Game 29.50% Medium
836 Rectangle Overlap 45.50% Easy
835 Image Overlap 50.30% Medium
834 Sum of Distances in Tree 38.10% Hard
833 Find And Replace in String 44.50% Medium
832 Flipping an Image   71.30% Easy
831 Masking Personal Information 41.50% Medium
830 Positions of Large Groups 47.40% Easy
829 Consecutive Numbers Sum  32.10% Hard
828 Unique Letter String 38.10% Hard
827 Making A Large Island 42.10% Hard
826 Most Profit Assigning Work 34.70% Medium
825 Friends Of Appropriate Ages 35.00% Medium
824 Goat Latin 56.70% Easy
823 Binary Trees With Factors  31.50% Medium
822 Card Flipping Game 39.70% Medium
821 Shortest Distance to a Character 62.60% Easy
820 Short Encoding of Words    46.00% Medium
819 Most Common Word  41.50% Easy
818 Race Car 34.00% Hard
817 Linked List Components  51.90% Medium
816 Ambiguous Coordinates  42.40% Medium
815 Bus Routes  36.10% Hard
814 Binary Tree Pruning 68.30% Medium
813 Largest Sum of Averages 42.40% Medium
812 Largest Triangle Area  53.80% Easy
811 Subdomain Visit Count   61.50% Easy
810 Chalkboard XOR Game 41.90% Hard
809 Expressive Words 39.50% Medium
808 Soup Servings 33.60% Medium
807 Max Increase to Keep City Skyline 79.60% Medium
806 Number of Lines To Write String  62.10% Easy
805 Split Array With Same Average  21.00% Hard
804 Unique Morse Code Words 71.30% Easy
803 Bricks Falling When Hit 22.90% Hard
802 Find Eventual Safe States  39.20% Medium
801 Minimum Swaps To Make Sequences Increasing  31.00%  Medium
800 Similar RGB Color $  54.50% Easy
799 Champagne Tower 29.90% Medium
798 Smallest Rotation with Highest Score  34.30% Hard
797 All Paths From Source to Target 67.40% Medium
796 Rotate String  49.60% Easy
795 Number of Subarrays with Bounded Maximum    41.60% Medium
794 Valid Tic-Tac-Toe State  27.80% Medium
793 Preimage Size of Factorial Zeroes Function     40.80% Hard
792 Number of Matching Subsequences 37.30% Medium
791 Custom Sort String  59.40% Medium
790 Domino and Tromino Tiling  32.80% Medium
789 Escape The Ghosts 51.00% Medium
788 Rotated Digits 51.00% Easy
787 Cheapest Flights Within K Stops  29.90% Medium
786 K-th Smallest Prime Fraction 32.50% Hard
785 Is Graph Bipartite? 38.50% Medium
784 Letter Case Permutation 53.00% Easy
783 Minimum Distance Between BST Nodes 47.80% Easy 
782 Transform to Chessboard 37.50% Hard
781 Rabbits in Forest  49.80% Medium
780 Reaching Points 23.90% Hard
779 K-th Symbol in Grammar 37.30% Medium
778 Swim in Rising Water  44.60% Hard
777 Swap Adjacent in LR String 28.90% Medium
776 Split BST $ 49.90% Medium
775 Global and Local Inversions  33.60% Medium
774 Minimize Max Distance to Gas Station $ 32.80% Hard
773 Sliding Puzzle 46.50% Hard
772 Basic Calculator III $ 40.10% Hard
771 Jewels and Stones  81.90% Easy
770 Basic Calculator IV 42.10% Hard
769 Max Chunks To Make Sorted 48.00% Medium
768 Max Chunks To Make Sorted II 43.20% Hard
767 Reorganize String 36.50%  Medium
766 Toeplitz Matrix 57.90% Easy
765 Couples Holding Hands 48.50% Hard
764 Largest Plus Sign 39.20% Medium
763 Partition Labels 64.10% Medium
762 Prime Number of Set Bits in Binary Representation 55.00% Easy
761 Special Binary String  41.00% Hard
760 Find Anagram Mappings $ 75.60% Easy
759 Employee Free Time $ 51.90% Hard
758 Bold Words in String $ 37.90% Easy
757 Set Intersection Size At Least Two 34.60% Hard
756 Pyramid Transition Matrix  45.50% Medium
755 Pour Water $ 34.00% Medium
754 Reach a Number 26.10% Medium
753 Cracking the Safe   39.70% Hard
752 Open the Lock 38.20% Medium
751 IP to CIDR $ 54.80% Easy
750 Number Of Corner Rectangles $ 51.00%  Medium
749 Contain Virus 39.60% Hard
748 Shortest Completing Word 53.50% Medium
747 Largest Number At Least Twice of Others  42.60% Easy
746 Min Cost Climbing Stairs 43.60% Easy 
745 Prefix and Suffix Search 24.50% Hard
744 Find Smallest Letter Greater Than Target 45.30% Easy
743 Network Delay Time 34.30% Medium
742 Closest Leaf in a Binary Tree $ 33.20% Medium
741 Cherry Pickup 22.50% Hard
740 Delete and Earn  42.60% Medium
739 Daily Temperatures 53.50% Medium
738 Monotone Increasing Digits  41.80%  Medium
737 Sentence Similarity II $ 41.20%  Medium
736 Parse Lisp Expression  42.00% Hard
735 Asteroid Collision 37.60% Medium
734 Sentence Similarity $ 38.60%  Easy
733 Flood Fill 49.30% Easy
732 My Calendar III 51.30% Hard
731 My Calendar II 35.00% Medium
730 Count Different Palindromic Subsequences 32.40% Hard
729 My Calendar I 40.10% Medium
728 Self Dividing Numbers 68.50% Easy
727 Minimum Window Subsequence 30.10% Hard
726 Number of Atoms 45.00% Hard
725 Split Linked List in Parts 50.00% Medium
724 Find Pivot Index 41.00% Easy
723 Candy Crush $ 56.10% Medium
722 Remove Comments 26.30% Medium
721 Accounts Merge 29.60% Medium
720 Longest Word in Dictionary 40.60% Easy
719 Find K-th Smallest Pair Distance 26.10% Hard
718 Maximum Length of Repeated Subarray 39.90% Medium
717 1-bit and 2-bit Characters 50.90% Easy
716 Max Stack $ 35.50% Hard
715 Range Module 31.00% Hard
714 Best Time to Buy and Sell Stock with Transaction Fee 41.60% Medium
713 Subarray Product Less Than K 32.90% Medium
712 Minimum ASCII Delete Sum for Two Strings 50.90% Medium
711 Number of Distinct Islands II $ 39.40% Hard
710 Random Pick with Blacklist  29.80% Hard
709 To Lower Case    74.50% Easy
708 Insert into a Cyclic Sorted List $ 25.50% Medium
707 Design Linked List      19.10% Easy
706 Design HashMap  49.10% Easy
705 Design HashSet    43.60% Easy
704 Binary Search 40.10% Easy
703 Kth Largest Element in a Stream  39.60% Easy
702 Search in a Sorted Array of Unknown Size 43.00% Medium
701 Insert into a Binary Search Tree 67.90% Medium
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
600 Non-negative Integers without Consecutive Ones 27.40% Hard
599 Minimum Index Sum of Two Lists 48.00% Easy
598 Range Addition II 48.30% Easy
597 Friend Requests I: Overall Acceptance Rate $ 38.40% Easy
596 Classes More Than 5 Students 33.40% Easy
595 Big Countries 72.00% Easy
594 Longest Harmonious Subsequence 40.00% Easy
593 Valid Square 39.20% Medium
592 Fraction Addition and Subtraction 47.00% Medium
591 Tag Validator 26.40% Hard
590 N-ary Tree Postorder Traversal 63.00% Easy
589 N-ary Tree Preorder Traversal 63.10% Easy
588 Design In-Memory File System $ 32.40%  Hard
587 Erect the Fence 29.90% Hard
586 Customer Placing the Largest Number of Orders $ 62.50% Easy
585 Investments in 2016 $ 44.60% Medium
584 Find Customer Referee $ 63.60% Easy
583 Delete Operation for Two Strings 44.00% Medium
582 Kill Process $ 47.70% Medium
581 Shortest Unsorted Continuous Subarray 30.10% Easy
580 Count Student Number in Departments $ 40.00% Medium
579 Find Cumulative Salary of an Employee $ 30.90% Hard
578 Get Highest Answer Rate Question $ 33.10% Medium
577 Employee Bonus $ 53.80% Easy
576 Out of Boundary Paths 33.10% Medium
575 Distribute Candies  59.50% Easy
574 Winning Candidate $ 34.50% Medium
573 Squirrel Simulation $ 51.00% Medium
572 Subtree of Another Tree 41.00% Easy
571 Find Median Given Frequency of Numbers $ 44.90% Hard
570 Managers with at Least 5 Direct Reports $ 59.00% Medium
569 Median Employee Salary $ 41.60% Hard 
568 Maximum Vacation Days $ 39.90% Hard
567 Permutation in String 36.30% Medium
566 Reshape the Matrix 59.80% Easy
565 Array Nesting 50.00% Medium
564 Find the Closest Palindrome 16.60% Hard
563 Binary Tree Tilt 47.00% Easy
562 Longest Line of Consecutive One in Matrix $ 38.80% Medium
561 Array Partition I 69.80% Easy
560 Subarray Sum Equals K  41.80% Medium
559 Maximum Depth of N-ary Tree 62.10% Easy
558 Quad Tree Intersection 36.40% Easy
557 Reverse Words in a String III 61.20% Easy
556 Next Greater Element III 27.70% Medium
555 Split Concatenated Strings $ 30.00% Medium
554 Brick Wall  42.70% Medium
553 Optimal Division  55.20% Medium
552 Student Attendance Record II 28.50% Hard
551 Student Attendance Record I 43.90% Easy
549 Binary Tree Longest Consecutive Sequence II $ 38.10% Medium
548 Split Array with Equal Sum $ 30.80% Medium
547 Friend Circles 49.00% Medium
546 Remove Boxes 29.60% Hard
545 Boundary of Binary Tree $ 29.10% Medium
544 Output Contest Matches $ 73.20% Medium
543 Diameter of Binary Tree 42.70% Easy
542 01 Matrix 32.50% Medium
541 Reverse String II 44.40% Easy
540 Single Element in a Sorted Array 55.90% Medium
539 Minimum Time Difference  44.70% Medium
538 Convert BST to Greater Tree 52.70% Medium
537 Complex Number Multiplication 65.90% Medium
536 Construct Binary Tree from String $ 36.30% Medium
535 Encode and Decode TinyURL 76.10% Medium
534 Design TinyURL N/A Medium
533 Lonely Pixel II $ 38.90% Medium
532 K-diff Pairs in an Array 27.20% Easy
531 Lonely Pixel I $ 50.20% Medium
530 Minimum Absolute Difference in BST 48.00% Easy
529 Minesweeper 52.00% Medium
528 Random Pick with Weight 41.80% Medium
527 Word Abbreviation $ 33.90% Hard
526 Beautiful Arrangement 53.50% Medium
525 Contiguous Array   34.40% Medium
524 Longest Word in Dictionary through Deleting 40.20% Medium
523 Continuous Subarray Sum 21.30 Medium
522 Longest Uncommon Subsequence II 28.10% Medium
521 Longest Uncommon Subsequence I 50.70% Easy
520 Detect Capital 54.20% Easy
519 Random Flip Matrix 32.20% Medium
518 Coin Change 2 33.20% Medium
517 Super Washing Machines 34.60% Hard
516 Longest Palindromic Subsequence 42.00% Medium
515 Find Largest Value in Each Tree Row 52.70% Medium
514 Freedom Trail 27.20% Hard
513 Find Bottom Left Tree Value 55.60% Medium
510 Inorder Successor in BST II $ 56.20% Medium
509 Fibonacci Number     66.40% Easy
508 Most Frequent Subtree Sum 52.00% Medium
507 Perfect Number 32.70% Easy
506 Relative Ranks 48.50% Easy
505 The Maze II 34.80% Medium
504 Base 7 46.40% Easy
503 Next Greater Element II 46.20% Medium
502 IPO 32.40% Hard
501 Find Mode in Binary Search Tree 39.40% Easy
500 Keyboard Row  60.20% Easy
499 The Maze III 32.00% Hard
498 Diagonal Traverse 46.20% Medium
497 Random Point in Non-overlapping Rectangles 33.20% Medium
496 Next Greater Element I  58.80% Easy
495 Teemo Attacking 51.90% Medium
494 Target Sum 44.40% Medium
493 Reverse Pairs 17.10% Hard
492 Construct the Rectangle 49.70% Easy
491 Increasing Subsequences 39.30%  Medium
490 The Maze 42.80% Medium
489 Robot Room Cleaner 57.10% Hard
488 Zuma Game  38.00% Hard
487 Max Consecutive Ones II $ 42.70% Medium
486 Predict the Winner 43.60% Medium
485 Max Consecutive Ones  55.30% Easy
484 Find Permutation $ 50.50% Medium
483 Smallest Good Base    30.60% Hard
482 License Key Formatting 41.20% Medium
481 Magical String 46.20% Medium
480 Sliding Window Median 31.00% Hard
479 Largest Palindrome Product 23.90% Easy
478 Generate Random Point in a Circle 33.80% Medium
477 Total Hamming Distance 44.10% Medium
476 Number Complement 61.20% Easy
475 Heaters  30.20% Easy
474 Ones and Zeroes  34.90% Medium
473 Matchsticks to Square  31.80% Medium
472 Concatenated Words 29.20% Hard
471 Encode String with Shortest Length $ 43.50% Hard
470 Implement Rand10() Using Rand7() 43.00% Medium
469 Convex Polygon $ 27.20% Medium
468 Validate IP Address 22.10% Medium
467 Unique Substrings in Wraparound String 29.90% Medium
466 Count The Repetitions  24.20% Hard
465 Optimal Account Balancing $ 29.20% Hard
464 Can I Win  22.20% Medium
463 Island Perimeter  56.70% Easy
462 Minimum Moves to Equal Array Elements II 50.90% Medium
461 Hamming Distance  73.20% Easy
460 LFU Cache 18.30% Hard
459 Repeated Substring Pattern  39.70% Easy
458 Poor Pigs 40.70% Easy
457 Circular Array Loop 20.60% Medium
456 132 Pattern  28.00% Medium
455 Assign Cookies 48.10% Easy
454 4Sum II 42.80% Medium
453 Minimum Moves to Equal Array Elements 46.30% Easy
452 Minimum Number of Arrows to Burst Balloons  42.10% Medium
451 Sort Characters By Frequency 50.90% Medium
450 Delete Node in a BST 34.50% Medium
449 Serialize and Deserialize BST  41.20% Medium
448 Find All Numbers Disappeared in an Array 58.30% Easy
447 Number of Boomerangs   42.20% Easy 
446 Arithmetic Slices II - Subsequence  22.30% Hard 
445 Add Two Numbers II   45.40% Medium
444 Sequence Reconstruction $ 20.50% Medium
443 String Compression 35.80% Easy
442 Find All Duplicates in an Array 46.40% Medium
441 Arranging Coins 36.20% Easy 
440 K-th Smallest in Lexicographical Order  21.50% Hard 
439 Ternary Expression Parser $ 49.40% Medium
438 Find All Anagrams in a String  33.50% Easy 
437 Path Sum III   38.60% Easy
436 Find Right Interval  42.30% Medium
435 Non-overlapping Intervals  39.80% Medium
434 Number of Segments in a String   38.40% Easy 
433 Minimum Genetic Mutation 33.50% Medium
432 All O`one Data Structure 28.30% Hard 
431 Encode N-ary Tree to Binary Tree $  53.70% Hard
430 Flatten a Multilevel Doubly Linked List 36.20% Medium
429 N-ary Tree Level Order Traversal 55.80% Easy
428 Serialize and Deserialize N-ary Tree $ 48.10% Hard
427 Construct Quad Tree 49.20% Easy
426 Convert Binary Search Tree to Sorted Doubly Linked List 43.30% Medium
425 Word Squares $ 40.10% Hard
424 Longest Repeating Character Replacement 38.10% Medium
423 Reconstruct Original Digits from English 40.80% Medium
422 Valid Word Square $ 36.40% Easy
421 Maximum XOR of Two Numbers in an Array 36.40% Medium
420 Strong Password Checker  22.10% Hard
419 Battleships in a Board  59.30% Medium
418 Sentence Screen Fitting $ 25.10% Medium
417 Pacific Atlantic Water Flow 31.10% Medium
416 Partition Equal Subset Sum 36.80% Medium
415 Add Strings  41.50% Easy
414 Third Maximum Number   26.50% Easy
413 Arithmetic Slices  53.50% Medium
412 Fizz Buzz 57.50% Easy 
411 Minimum Unique Word Abbreviation $ 25.60% Hard
410 Split Array Largest Sum  25.00% Hard
409 Longest Palindrome  44.90% Easy
408 Valid Word Abbreviation $ 26.20% Easy
407 Trapping Rain Water II  33.10% Hard
406 Queue Reconstruction by Height 54.10% Medium
405 Convert a Number to Hexadecimal 41.80% Easy
404 Sum of Left Leaves  46.20% Easy
403 Frog Jump 31.70% Hard
402 Remove K Digits  25.90% Medium
401 Binary Watch  43.00% Easy
400 Nth Digit 30.70% Easy
399 Evaluate Division 34.60% Medium
398 Random Pick Index 30.40% Medium
397 Integer Replacement 25.90% Easy
396 Rotate Function  28.40% Easy
395 Longest Substring with At Least K Repeating Characters 32.50% Medium
394 Decode String 38.60% Medium
393 UTF-8 Validation  33.00% Medium
392 Is Subsequence   44.10% Medium
391 Perfect Rectangle 13.30% Hard 
390 Elimination Game 12.50%  Medium
389 Find the Difference 49.90% Easy 
388 Longest Absolute File Path  28.30%  Medium
387 First Unique Character in a String  43.10%  Easy 
386 Lexicographical Numbers 31.00%  Medium
385 Mini Parser  26.90%  Medium
384 Shuffle an Array  45.50%  Medium
383 Ransom Note 44.60%  Easy 
382 Linked List Random Node  48.60% Medium
381 Insert Delete GetRandom O(1) - Duplicates allowed 30.90% Hard
380 Insert Delete GetRandom O(1) 33.80% Medium
379 Design Phone Directory $  25.80%  Medium
378 Kth Smallest Element in a Sorted Matrix 40.20% Medium
377 Combination Sum IV  37.50% Medium
376 Wiggle Subsequence 35.80% Medium
375 Guess Number Higher or Lower II  28.30% Medium
374 Guess Number Higher or Lower  31.70% Easy
373 Find K Pairs with Smallest Sums  25.50% Medium
372 Super Pow 30.10% Medium
371 Sum of Two Integers  54.00% Easy
370 Range Addition $ 49.90% Medium
369 Plus One Linked List $ 50.10% Medium
368 Largest Divisible Subset  32.00% Medium
367 Valid Perfect Square  36.60% Medium
366 Find Leaves of Binary Tree $ 53.60% Medium
365 Water and Jug Problem  20.10% Medium
364 Nested List Weight Sum II $ 47.20% Medium
363 Max Sum of Rectangle No Larger Than K 27.00% Hard
362 Design Hit Counter $ 48.30% Medium
361 Bomb Enemy $ 32.60% Medium
360 Sort Transformed Array $ 40.80% Medium
359 Logger Rate Limiter $ 56.00% Easy
358 Rearrange String k Distance Apart $ 26.90% Hard
357 Count Numbers with Unique Digits  42.50% Medium
356 Line Reflection $ 28.70% Medium
355 Design Twitter 22.20% Medium
354 Russian Doll Envelopes  27.10% Hard
353 Design Snake Game $ 19.80% Medium
352 Data Stream as Disjoint Intervals  34.40% Hard
351 Android Unlock Patterns $ 32.00% Medium
350 Intersection of Two Arrays II 41.50% Easy
349 Intersection of Two Arrays 47.80%  Easy 
348 Design Tic-Tac-Toe  $ 45.60% Medium
347 Top K Frequent Elements  44.50% Medium
346 Moving Average from Data Stream  $ 69.20% Easy
345 Reverse Vowels of a String  35.30% Easy
344 Reverse String 58.90% Easy
343 Integer Break 43.60% Medium
342 Power of Four 34.10% Easy
341 Flatten Nested List Iterator $ 18.70% Medium
340 Longest Substring with At Most K Distinct Characters $ 36.30% Hard
339 Nested List Weight Sum $ 54.60% Easy
338 Counting Bits  55.40% Medium
337 House Robber III  37.00% Medium
336 Palindrome Pairs  18.70% Hard
335 Self Crossing  18.00% Medium
334 Increasing Triplet Subsequence 33.20% Medium
333 Largest BST Subtree $ 26.50% Medium
332 Reconstruct Itinerary 23.40% Medium
331 Verify Preorder Serialization of a Binary Tree 31.50% Medium
330 Patching Array 28.80% Medium
329 Longest Increasing Path in a Matrix 29.50% Medium
328 Odd Even Linked List 37.80% Easy
327 Count of Range Sum 24.30% Hard
326 Power of Three 35.30% Easy
325 Maximum Size Subarray Sum Equals k $ 39.60% Easy
324 Wiggle Sort II 20.10% Medium
323 Number of Connected Components in an Undirected Graph $ 43.30% Medium
322 Coin Change 24.90% Medium
321 Create Maximum Number 19.10% Hard
320 Generalized Abbreviation $ 40.40% Medium
319 Bulb Switcher 39.20% Medium
318 Maximum Product of Word Lengths 38.70% Medium
317 Shortest Distance from All Buildings $ 29.10% Hard 
316 Remove Duplicate Letters 23.00% Medium
315 Count of Smaller Numbers After Self 28.20% Hard 
314 Binary Tree Vertical Order Traversal $ 30.10% Medium
313 Super Ugly Number 31.20% Medium
312 Burst Balloons 24.50% Medium
311 Sparse Matrix Multiplication $ 40.00% Medium
310 Minimum Height Trees  20.20% Medium
309 Best Time to Buy and Sell Stock with Cooldown  32.60% Medium
308 Range Sum Query 2D - Mutable $ 20.30% Hard
307 Range Sum Query - Mutable  14.50% Medium
306 Additive Number 23.30% Medium
305 Number of Islands II $ 26.70% Hard
304 Range Sum Query 2D - Immutable 21.50% Medium
303 Range Sum Query - Immutable 25.70% Easy
302 Smallest Rectangle Enclosing Black Pixels $ 36.70% Hard
301 Remove Invalid Parentheses 27.00% Hard
300 Longest Increasing Subsequence 31.50% Medium
299 Bulls and Cows 23.80% Easy
298 Binary Tree Longest Consecutive Sequence $ 32.20% Medium
297 Serialize and Deserialize Binary Tree 23.80% Medium
296 Best Meeting Point $ 41.40% Hard
295 Find Median from Data Stream 18.60% Hard
294 Flip Game II $ 38.10% Medium
293 Flip Game $ 47.60% Easy
292 Nim Game  49.50% Easy
291 Word Pattern II $ 31.50% Hard
290 Word Pattern 26.50% Easy
289 Game of Life 32.60% Medium
288 Unique Word Abbreviation $ 16.80% Easy
287 Find the Duplicate Number 32.80% Hard
286 Walls and Gates $ 29.90% Medium
285 Inorder Successor in BST $ 32.50% Medium
284 Peeking Iterator 31.00% Medium
283 Move Zeroes 41.40% Easy
282 Expression Add Operators 18.90% Hard
281 Zigzag Iterator $ 37.20% Medium
280 Wiggle Sort $ 43.30% Medium
279 Perfect Squares 28.80% Medium
278 First Bad Version 19.80% Easy
277 Find the Celebrity $ 31.70% Medium
276 Paint Fence $ 25.00% Easy
275 H-Index II 31.40% Medium
274 H-Index 25.30% Medium
273 Integer to English Words 15.50% Medium
272 Closest Binary Search Tree Value II $ 26.90% Hard
271 Encode and Decode Strings $ 25.40% Medium
270 Closest Binary Search Tree Value $ 29.40% Easy
269 Alien Dictionary $ 16.50% Hard
268 Missing Number 34.70% Medium
267 Palindrome Permutation II $ 22.50% Medium
266 Palindrome Permutation $ 45.80% Easy
265 Paint House II $ 30.00% Hard
264 Ugly Number II 21.60% Medium
263 Ugly Number 32.6% Easy
262 Trips and Users * 16.10% Hard
261 Graph Valid Tree $ 25.40% Medium
260 Single Number III 37.60% Medium
259 3Sum Smaller $ 34.20% Medium
258 Add Digits 46.50% Easy
257 Binary Tree Paths 21.90% Easy
256 Paint House $ 38.40% Medium
255 Verify Preorder Sequence in Binary Search Tree $ 32.30% Medium
254 Factor Combinations $ 29.00% Medium
253 Meeting Rooms II $ 28.80% Medium
252 Meeting Rooms $ 35.40% Easy
251 Flatten 2D Vector $ 28.30% Medium
250 Count Univalue Subtrees $ 32.70% Medium
249 Group Shifted Strings $ 25.20% Easy
248 Strobogrammatic Number III $ 21.80% Hard
247 Strobogrammatic Number II $ 26.70% Medium
246 Strobogrammatic Number $ 31.60% Easy
245 Shortest Word Distance III $ 43.20% Medium
244 Shortest Word Distance II $ 33.70% Medium
243 Shortest Word Distance $ 41.80% Easy
242 Valid Anagram 39.30% Easy
241 Different Ways to Add Parentheses 27.10% Medium
240 Search a 2D Matrix II 31.40% Medium
239 Sliding Window Maximum 24.30% Hard 
238 Product of Array Except Self 42.40% Medium
237 Delete Node in a Linked List 50.90% Easy
236 Lowest Common Ancestor of a Binary Tree 28.30% Medium
235 Lowest Common Ancestor of a Binary Search Tree 38.90% Medium
234 Palindrome Linked List 23.80% Easy
233 Number of Digit One 16.10% Medium
232 Implement Queue using Stacks 37.40% Easy
231 Power of Two 31.30% Easy
230 Kth Smallest Element in a BST 30.50% Medium
229 Majority Element II 30.50% Medium
228 Summary Ranges 21.10% Easy
227 Basic Calculator II 18.00% Medium
226 Invert Binary Tree 35.40% Easy
225 Implement Stack using Queues 29.60% Medium
224 Basic Calculator 15.80% Medium
223 Rectangle Area 25.60% Easy
222 Count Complete Tree Nodes 19.40% Medium
221 Maximal Square 20.30% Medium
220 Contains Duplicate III 15.30% Medium
219 Contains Duplicate II 25.60% Easy
218 The Skyline Problem 16.20% Hard
217 Contains Duplicate 35.90% Easy
216 Combination Sum III 27.70% Medium
215 Kth Largest Element in an Array 27.30% Medium
214 Shortest Palindrome 16.80% Hard
213 House Robber II 26.30% Medium
212 Word Search II 15.00% Hard
211 Add and Search Word - Data structure design 20.70% Medium
210 Course Schedule II 19.30% Medium
209 Minimum Size Subarray Sum 22.90% Medium
208 Implement Trie (Prefix Tree) 24.80% Medium
207 Course Schedule 21.70% Medium
206 Reverse Linked List 31.50% Easy
205 Isomorphic Strings 24.20% Easy
204 Count Primes 19.00% Easy
203 Remove Linked List Elements 25.80% Easy
202 Happy Number 31.40% Easy
201 Bitwise AND of Numbers Range 23.30% Medium
200 Number of Islands 21.90% Medium
199 Binary Tree Right Side View 27.10% Medium
198 House Robber 28.80% Easy
197 Rising Temperature * 25.90% Easy
196 Delete Duplicate Emails * 19.00% Easy
195 Tenth Line # 32.20% Easy
194 Transpose File # 21.40% Medium
193 Valid Phone Numbers # 24.40% Easy
192 Word Frequency # 26.10% Medium
191 Number of 1 Bits 37.30% Easy
190 Reverse Bits 28.40% Easy
189 Rotate Array 17.80% Easy
188 Best Time to Buy and Sell Stock IV 17.30% Hard
187 Repeated DNA Sequences 19.50% Medium
186 Reverse Words in a String II $ 31.10% Medium
185 Department Top Three Salaries * 15.20% Hard
184 Department Highest Salary * 19.00% Medium
183 Customers Who Never Order * 33.70% Easy
182 Duplicate Emails * 38.10% Easy
181 Employees Earning More Than Their Managers * 41.00% Easy
180 Consecutive Numbers * 26.60% Medium
179 Largest Number 15.70% Medium
178 Rank Scores * 24.60% Medium
177 Nth Highest Salary * 16.30% Medium
176 Second Highest Salary * 25.00% Easy
175 Combine Two Tables * 34.40% Easy
174 Dungeon Game 17.70% Hard
173 Binary Search Tree Iterator 29.30% Medium
172 Factorial Trailing Zeroes 28.40% Easy
171 Excel Sheet Column Number 36.50% Easy
170 Two Sum III - Data structure design $ 24.70% Easy
169 Majority Element 35.00% Easy
168 Excel Sheet Column Title 18.10% Easy
167 Two Sum II - Input array is sorted $ 43.30% Medium
166 Fraction to Recurring Decimal 12.70% Medium
165 Compare Version Numbers 15.20% Easy
164 Maximum Gap 24.40% Hard
163 Missing Ranges $ 24.10% Medium
162 Find Peak Element 31.50% Medium
161 One Edit Distance $ 24.00% Medium
160 Intersection of Two Linked Lists 28.70% Easy
159 Longest Substring with At Most Two Distinct Characters $ 30.20% Hard
158 Read N Characters Given Read4 II - Call multiple times $ 22.30% Hard
157 Read N Characters Given Read4 $ 29.80% Easy
156 Binary Tree Upside Down $ 34.30% Medium
155 Min Stack 18.50% Easy
154 Find Minimum in Rotated Sorted Array II 31.90% Hard
153 Find Minimum in Rotated Sorted Array 33.30% Medium
152 Maximum Product Subarray 19.40% Medium
151 Reverse Words in a String 15.10% Medium
150 Evaluate Reverse Polish Notation 21.10% Medium
149 Max Points on a Line 12.60% Hard
148 Sort List 22.00% Medium
147 Insertion Sort List 26.40% Medium
146 LRU Cache 15.00% Hard
145 Binary Tree Postorder Traversal 32.40% Hard
144 Binary Tree Preorder Traversal 36.30% Medium
143 Reorder List 21.00% Medium
142 Linked List Cycle II 31.40% Medium
141 Linked List Cycle 36.30% Medium
140 Word Break II 17.70% Hard
139 Word Break 23.00% Medium
138 Copy List with Random Pointer 25.10% Hard
137 Single Number II 35.00% Medium
136 Single Number 45.10% Medium
135 Candy 20.50% Hard
134 Gas Station 25.70% Medium
133 Clone Graph 24.00% Medium
132 Palindrome Partitioning II 19.70% Hard
131 Palindrome Partitioning 26.70% Medium
130 Surrounded Regions 14.60% Medium
129 Sum Root to Leaf Numbers 30.30% Medium
128 Longest Consecutive Sequence 29.40% Hard
127 Word Ladder 19.30% Medium
126 Word Ladder II 12.90% Hard
125 Valid Palindrome 22.00% Easy
124 Binary Tree Maximum Path Sum 21.50% Hard
123 Best Time to Buy and Sell Stock III 23.90% Hard
122 Best Time to Buy and Sell Stock II 38.30% Medium
121 Best Time to Buy and Sell Stock 32.60% Medium
120 Triangle 27.40% Medium
119 Pascal's Triangle II 29.40% Easy
118 Pascal's Triangle 30.10% Easy
117 Populating Next Right Pointers in Each Node II 32.00% Hard
116 Populating Next Right Pointers in Each Node 36.20% Medium
115 Distinct Subsequences 26.30% Hard
114 Flatten Binary Tree to Linked List 28.80% Medium
113 Path Sum II 26.60% Medium
112 Path Sum 29.80% Easy
111 Minimum Depth of Binary Tree 29.10% Easy
110 Balanced Binary Tree 32.00% Easy
109 Convert Sorted List to Binary Search Tree 27.90% Medium
108 Convert Sorted Array to Binary Search Tree 34.00% Medium
107 Binary Tree Level Order Traversal II 31.10% Easy
106 Construct Binary Tree from Inorder and Postorder Traversal 26.80% Medium
105 Construct Binary Tree from Preorder and Inorder Traversal 26.40% Medium
104 Maximum Depth of Binary Tree 45.10% Easy
103 Binary Tree Zigzag Level Order Traversal 26.40% Medium
102 Binary Tree Level Order Traversal 29.30% Easy
101 Symmetric Tree 31.60% Easy
100 Same Tree 41.80% Easy
99 Recover Binary Search Tree 24.30% Hard
98 Validate Binary Search Tree 20.60% Medium
97 Interleaving String 20.80% Hard
96 Unique Binary Search Trees 36.00% Medium
95 Unique Binary Search Trees II 28.00% Medium
94 Binary Tree Inorder Traversal 36.20% Medium
93 Restore IP Addresses 21.00% Medium
92 Reverse Linked List II 26.10% Medium
91 Decode Ways 16.40% Medium
90 Subsets II 27.70% Medium
89 Gray Code 32.80% Medium
88 Merge Sorted Array 29.70% Easy
87 Scramble String 24.20% Hard
86 Partition List 27.50% Medium
85 Maximal Rectangle 22.00% Hard
84 Largest Rectangle in Histogram 22.60% Hard
83 Remove Duplicates from Sorted List 34.50% Easy
82 Remove Duplicates from Sorted List II 25.00% Medium
81 Search in Rotated Sorted Array II 31.40% Medium
80 Remove Duplicates from Sorted Array II 30.50% Medium
79 Word Search 20.30% Medium
78 Subsets 28.20% Medium
77 Combinations 30.90% Medium
76 Minimum Window Substring 18.90% Hard
75 Sort Colors 32.60% Medium
74 Search a 2D Matrix 31.60% Medium
73 Set Matrix Zeroes 31.40% Medium
72 Edit Distance 26.20% Hard
71 Simplify Path 20.00% Medium
70 Climbing Stairs 34.40% Easy
69 Sqrt(x) 23.10% Medium
68 Text Justification 14.60% Hard
67 Add Binary 24.70% Easy
66 Plus One 30.40% Easy
65 Valid Number 11.40% Hard
64 Minimum Path Sum 32.20% Medium
63 Unique Paths II 28.00% Medium
62 Unique Paths 32.80% Medium
61 Rotate List 21.70% Medium
60 Permutation Sequence 22.80% Medium
59 Spiral Matrix II 31.80% Medium
58 Length of Last Word 28.00% Easy
57 Insert Interval 21.40% Hard
56 Merge Intervals 22.40% Hard
55 Jump Game 27.00% Medium
54 Spiral Matrix 20.80% Medium
53 Maximum Subarray 34.50% Medium
52 N-Queens II 35.80% Hard
51 N-Queens 26.50% Hard
50 Pow(x, n) 26.70% Medium
49 Anagrams 24.30% Medium
48 Rotate Image 31.90% Medium
47 Permutations II 25.80% Hard
46 Permutations 31.90% Medium
45 Jump Game II 24.20% Hard
44 Wildcard Matching 15.00% Hard
43 Multiply Strings 21.00% Medium
42 Trapping Rain Water 30.00% Hard
41 First Missing Positive 22.90% Hard
40 Combination Sum II 25.20% Medium
39 Combination Sum 27.90% Medium
38 Count and Say 25.20% Easy
37 Sudoku Solver 21.80% Hard
36 Valid Sudoku 27.20% Easy
35 Search Insert Position 35.40% Medium
34 Search for a Range 27.50% Medium
33 Search in Rotated Sorted Array 28.80% Hard
32 Longest Valid Parentheses 20.90% Hard
31 Next Permutation 25.00% Medium
30 Substring with Concatenation of All Words 19.40% Hard
29 Divide Two Integers 15.00% Medium
28 Implement strStr() 22.20% Easy
27 Remove Element 32.10% Easy
26 Remove Duplicates from Sorted Array 31.30% Easy
25 Reverse Nodes in k-Group 25.50% Hard
24 Swap Nodes in Pairs 32.50% Medium
23 Merge k Sorted Lists 21.10% Hard
22 Generate Parentheses 32.60% Medium
21 Merge Two Sorted Lists 32.70% Easy
20 Valid Parentheses 26.50% Easy
19 Remove Nth Node From End of List 27.10% Easy
18 4Sum 21.70% Medium
17 Letter Combinations of a Phone Number 25.80% Medium
16 3Sum Closest 26.90% Medium
15 3Sum 16.90% Medium
14 Longest Common Prefix 25.50% Easy
13 Roman to Integer 34.00% Easy
12 Integer to Roman 33.80% Medium
11 Container With Most Water 32.00% Medium
10 Regular Expression Matching 20.70% Hard
9 Palindrome Number 28.30% Easy
8 String to Integer (atoi) 13.00% Easy
7 Reverse Integer 25.10% Easy
6 ZigZag Conversion 21.80% Easy
5 Longest Palindromic Substring 20.70% Medium
4 Median of Two Sorted Arrays 17.40% Hard
3 Longest Substring Without Repeating Characters 20.60% Medium
2 Add Two Numbers 21.10% Medium
1 Two Sum 17.70% Medium

 

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