|
状态
|
#
|
解题报告
|
分类
|
难度
|
|---|---|---|---|---|
| 1425 | Constrained Subsequence Sum | Algorithms | Hard | |
| 1419 | Minimum Number of Frogs Croaking | Algorithms | Medium | |
| 1168 | Optimize Water Distribution in a Village | Algorithms | Hard | |
| 1114 | Print in Order | Concurrency | Easy | |
| 1019 | Next Greater Node In Linked List | Algorithms | Medium | |
| 1017 | Convert to Base -2 | Algorithms | Medium | |
| 1015 | Numbers With Repeated Digits | Algorithms | Hard | |
| 1014 | Capacity To Ship Packages Within D Days | Algorithms | Medium | |
| 952 | Largest Component Size by Common Factor | Algorithms | Hard | |
| 950 | Reveal Cards In Increasing Order | Algorithms | Medium | |
| 875 | Koko Eating Bananas | Algorithms | Medium | |
| 873 | Length of Longest Fibonacci Subsequence | Algorithms | Medium | |
| 871 | Minimum Number of Refueling Stops | Algorithms | Hard | |
| 870 | Advantage Shuffle | Algorithms | Medium | |
| 855 | Exam Room | Algorithms | Medium | |
| 854 | K-Similar Strings | Algorithms | Hard | |
| 853 | Car Fleet | Algorithms | Medium | |
| 847 | Shortest Path Visiting All Nodes | Algorithms | Hard | |
| 846 | Hand of Straights | Algorithms | Medium | |
| 845 | Longest Mountain in Array | Algorithms | Medium | |
| 844 | Backspace String Compare | Algorithms | Easy | |
| 831 | Masking Personal Information | Algorithms | Medium | |
| 830 | Positions of Large Groups | Algorithms | Easy | |
| 829 | Consecutive Numbers Sum | Algorithms | Medium | |
| 828 | Unique Letter String | Algorithms | Hard | |
| 827 | Making A Large Island | Algorithms | Hard | |
| 826 | Most Profit Assigning Work | Algorithms | Medium | |
| 825 | Friends Of Appropriate Ages | Algorithms | Medium | |
| 824 | Goat Latin | Algorithms | Easy | |
| 822 | Card Flipping Game | Algorithms | Medium | |
| 821 | Shortest Distance to a Character | Algorithms | Easy | |
| 820 | Short Encoding of Words | Algorithms | Medium | |
| 819 | Most Common Word | Algorithms | Easy | |
| 817 | Linked List Components | Algorithms | Medium | |
| 816 | Ambiguous Coordinates | Algorithms | Medium | |
| 815 | Bus Routes | Algorithms | Hard | |
| 814 | Binary Tree Pruning | Algorithms | Medium | |
| 813 | Largest Sum of Averages | Algorithms | Medium | |
| 812 | Largest Triangle Area | Algorithms | Easy | |
| 811 | Subdomain Visit Count | Algorithms | Easy | |
| 809 | Expressive Words | Algorithms | Medium | |
| 808 | Soup Servings | Algorithms | Medium | |
| 807 | Max Increase to Keep City Skyline | Algorithms | Medium | |
| 806 | Number of Lines To Write String | Algorithms | Easy | |
| 805 | Split Array With Same Average | Algorithms | Hard | |
| 804 | Unique Morse Code Words | Algorithms | Easy | |
| 803 | Bricks Falling When Hit | Algorithms | Hard | |
| 799 | Champagne Tower | Algorithms | Medium | |
| 798 | Smallest Rotation with Highest Score | Algorithms | Medium | |
| 797 | All Paths From Source to Target | Algorithms | Medium | |
| 796 | Rotate String | Algorithms | Easy | |
| 795 | Number of Subarrays with Bounded Maximum | Algorithms | Medium | |
| 794 | Valid Tic-Tac-Toe State | Algorithms | Medium | |
| 793 | Preimage Size of Factorial Zeroes Function | Algorithms | Hard | |
| 792 | Number of Matching Subsequences | Algorithms | Medium | |
| 791 | Custom Sort String | Algorithms | Medium | |
| 790 | Domino and Tromino Tiling | Algorithms | Medium | |
| 789 | Escape The Ghosts | Algorithms | Medium | |
| 788 | Rotated Digits | Algorithms | Easy | |
| 787 | Cheapest Flights Within K Stops | Algorithms | Medium | |
| 786 | K-th Smallest Prime Fraction | Algorithms | Hard | |
| 785 | Is Graph Bipartite? | Algorithms | Medium | |
| 784 | Letter Case Permutation | Algorithms | Easy | |
| 783 | Minimum Distance Between BST Nodes | Algorithms | Easy | |
| 781 | Rabbits in Forest | Algorithms | Medium | |
| 780 | Reaching Points | Algorithms | Hard | |
| 779 | K-th Symbol in Grammar | Algorithms | Easy | |
| 778 | Swim in Rising Water | Algorithms | Hard | |
| 777 | Swap Adjacent in LR String | Algorithms | Medium | |
| 776 | Split BST | Algorithms | Medium | |
| 775 | Global and Local Inversions | Algorithms | Medium | |
| 774 | Minimize Max Distance to Gas Station | Algorithms | Hard | |
| 773 | Sliding Puzzle | Algorithms | Medium | |
| 771 | Jewels and Stones | Algorithms | Easy | |
| 770 | Basic Calculator IV | Algorithms | Hard | |
| 769 | Max Chunks To Make Sorted (ver. 1) | Algorithms | Medium | |
| 768 | Max Chunks To Make Sorted (ver. 2) | Algorithms | Medium | |
| 767 | Reorganize String | Algorithms | Medium | |
| 766 | Toeplitz Matrix | Algorithms | Easy | |
| 764 | Largest Plus Sign | Algorithms | Medium | |
| 763 | Partition Labels | Algorithms | Medium | |
| 762 | Prime Number of Set Bits in Binary Representation | Algorithms | Easy | |
| 760 | Find Anagram Mappings | Algorithms | Easy | |
| 759 | Employee Free Time | Algorithms | Hard | |
| 758 | Bold Words in String | Algorithms | Easy | |
| 756 | Pour Water | Algorithms | Medium | |
| 755 | Reach a Number | Algorithms | Easy | |
| 753 | Cracking the Safe | Algorithms | Hard | |
| 752 | Open the Lock | Algorithms | Medium | |
| 751 | IP to CIDR | Algorithms | Easy | |
| 750 | Number Of Corner Rectangles | Algorithms | Medium | |
| 749 | Contain Virus | Algorithms | Hard | |
| 748 | Shortest Completing Word | Algorithms | Easy | |
| 747 | Largest Number Greater Than Twice of Others | Algorithms | Easy | |
| 746 | Min Cost Climbing Stairs | Algorithms | Easy | |
| 745 | Prefix and Suffix Search | Algorithms | Hard | |
| 744 | Find Smallest Letter Greater Than Target | Algorithms | Easy | |
| 743 | Network Delay Time | Algorithms | Medium | |
| 742 | Closest Leaf in a Binary Tree | Algorithms | Medium | |
| 740 | Delete and Earn | Algorithms | Medium | |
| 739 | Daily Temperatures | Algorithms | Easy | |
| 738 | Monotone Increasing Digits | Algorithms | Medium | |
| 737 | Sentence Similarity II | Algorithms | Medium | |
| 736 | Parse Lisp Expression | Algorithms | Hard | |
| 735 | Asteroid Collision | Algorithms | Medium | |
| 734 | Sentence Similarity | Algorithms | Easy | |
| 733 | Flood Fill | Algorithms | Easy | |
| 732 | My Calendar III | Algorithms | Hard | |
| 731 | My Calendar II | Algorithms | Easy | |
| 730 | Count Different Palindromic Subsequences | Algorithms | Hard | |
| 729 | My Calendar I | Algorithms | Medium | |
| 728 | Self Dividing Numbers | Algorithms | Easy | |
| 727 | Minimum Window Subsequence | Algorithms | Hard | |
| 726 | Number of Atoms | Algorithms | Medium | |
| 725 | Split Linked List in Parts | Algorithms | Medium | |
| 724 | Find Pivot Index | Algorithms | Easy | |
| 723 | Candy Crush | Algorithms | Medium | |
| 722 | Remove Comments | Algorithms | Medium | |
| 721 | Accounts Merge | Algorithms | Medium | |
| 720 | Longest Word in Dictionary | Algorithms | Easy | |
| 719 | Find K-th Smallest Pair Distance | Algorithms | Hard | |
| 718 | Maximum Length of Repeated Subarray | Algorithms | Medium | |
| 717 | 1-bit and 2-bit Characters | Algorithms | Easy | |
| 715 | Range Module | Algorithms | Hard | |
| 714 | Best Time to Buy and Sell Stock with Transaction Fee | Algorithms | Medium | |
| 713 | Subarray Product Less Than K | Algorithms | Medium | |
| 712 | Minimum ASCII Delete Sum for Two Strings | Algorithms | Medium | |
| 699 | Falling Squares | Algorithms | Hard | |
| 698 | Partition to K Equal Sum Subsets | Algorithms | Medium | |
| 697 | Degree of an Array | Algorithms | Easy | |
| 696 | Count Binary Substrings | Algorithms | Easy | |
| 695 | Max Area of Island | Algorithms | Easy | |
| 694 | Number of Distinct Islands | Algorithms | Medium | |
| 693 | Binary Number with Alternating Bits | Algorithms | Easy | |
| 692 | Top K Frequent Words | Algorithms | Medium | |
| 691 | Stickers to Spell Word | Algorithms | Hard | |
| 690 | Employee Importance | Algorithms | Easy | |
| 689 | Maximum Sum of 3 Non-Overlapping Subarrays | Algorithms | Hard | |
| 688 | Knight Probability in Chessboard | Algorithms | Medium | |
| 687 | Longest Univalue Path | Algorithms | Easy | |
| 686 | Repeated String Match | Algorithms | Easy | |
| 685 | Redundant Connection II | Algorithms | Hard | |
| 684 | Redundant Connection | Algorithms | Medium | |
| 683 | K Empty Slots | Algorithms | Hard | |
| 682 | Baseball Game | Algorithms | Easy | |
| 681 | Next Closest Time | Algorithms | Medium | |
| 680 | Valid Palindrome II | Algorithms | Easy | |
| 679 | 24 Game | Algorithms | Hard | |
| 678 | Valid Parenthesis String | Algorithms | Medium | |
| 677 | Map Sum Pairs | Algorithms | Medium | |
| 676 | Implement Magic Dictionary | Algorithms | Medium | |
| 675 | Cut Off Trees for Golf Event | Algorithms | Hard | |
| 674 | Longest Continuous Increasing Subsequence | Algorithms | Easy | |
| 673 | Number of Longest Increasing Subsequence | Algorithms | Medium | |
| 672 | Bulb Switcher II | Algorithms | Medium | |
| 671 | Second Minimum Node In a Binary Tree | Algorithms | Easy | |
| 670 | Maximum Swap | Algorithms | Medium | |
| 669 | Trim a Binary Search Tree | Algorithms | Easy | |
| 668 | Kth Smallest Number in Multiplication Table | Algorithms | Hard | |
| 667 | Beautiful Arrangement II | Algorithms | Medium | |
| 666 | Path Sum IV | Algorithms | Medium | |
| 665 | Non-decreasing Array | Algorithms | Easy | |
| 664 | Strange Printer | Algorithms | Hard | |
| 663 | Equal Tree Partition | Algorithms | Medium | |
| 662 | Maximum Width of Binary Tree | Algorithms | Medium | |
| 661 | Image Smoother | Algorithms | Easy | |
| 660 | Remove 9 | Algorithms | Medium | |
| 659 | Split Array into Consecutive Subsequences | Algorithms | Medium | |
| 658 | Find K Closest Elements | Algorithms | Medium | |
| 657 | Judge Route Circle | Algorithms | Easy | |
| 656 | Coin Path | Algorithms | Hard | |
| 655 | Print Binary Tree | Algorithms | Medium | |
| 654 | Maximum Binary Tree | Algorithms | Medium | |
| 653 | Two Sum IV - Input is a BST | Algorithms | Easy | |
| 652 | Find Duplicate Subtrees | Algorithms | Medium | |
| 651 | 4 Keys Keyboard | Algorithms | Medium | |
| 650 | 2 Keys Keyboard | Algorithms | Medium | |
| 649 | Dota2 Senate | Algorithms | Medium | |
| 648 | Replace Words | Algorithms | Hard | |
| 647 | Palindromic Substrings | Algorithms | Medium | |
| 646 | Maximum Length of Pair Chain | Algorithms | Medium | |
| 645 | Set Mismatch | Algorithms | Easy | |
| 644 | Maximum Average Subarray II | Algorithms | Hard | |
| 643 | Maximum Average Subarray I | Algorithms | Easy | |
| 642 | Design Search Autocomplete System | Algorithms | Hard | |
| 640 | Solve the Equation | Algorithms | Medium | |
| 639 | Decode Ways II | Algorithms | Hard | |
| 638 | Shopping Offers | Algorithms | Medium | |
| 637 | Average of Levels in Binary Tree | Algorithms | Easy | |
| 636 | Exclusive Time of Functions | Algorithms | Medium | |
| 635 | Design Log Storage System | Algorithms | Medium | |
| 634 | Find the Derangement of An Array | Algorithms | Medium | |
| 633 | Sum of Square Numbers | Algorithms | Easy | |
| 632 | Smallest Range | Algorithms | Hard | |
| 631 | Design Excel Sum Formula | Algorithms | Hard | |
| 630 | Course Schedule III | Algorithms | Medium | |
| 629 | K Inverse Pairs Array | Algorithms | Medium | |
| 628 | Maximum Product of Three Numbers | Algorithms | Easy | |
| 625 | Minimum Factorization | Algorithms | Medium | |
| 624 | Maximum Distance in Arrays | Algorithms | Easy | |
| 623 | Add One Row to Tree | Algorithms | Medium | |
| 621 | Task Scheduler | Algorithms | Medium | |
| 617 | Merge Two Binary Trees | Algorithms | Easy | |
| 616 | Add Bold Tag in String | Algorithms | Medium | |
| 611 | Valid Triangle Number | Algorithms | Medium | |
| 609 | Find Duplicate File in System | Algorithms | Medium | |
| 606 | Construct String from Binary Tree | Algorithms | Easy | |
| 605 | Can Place Flowers | Algorithms | Easy | |
| 604 | Design Compressed String Iterator | Algorithms | Easy | |
| 600 | Non-negative Integers without Consecutive Ones | Algorithms | Hard | |
| 599 | Minimum Index Sum of Two Lists | Algorithms | Easy | |
| 598 | Range Addition II | Algorithms | Easy | |
| 594 | Longest Harmonious Subsequence | Algorithms | Easy | |
| 593 | Valid Square | Algorithms | Medium | |
| 592 | Fraction Addition and Subtraction | Algorithms | Medium | |
| 591 | Tag Validator | Algorithms | Hard | |
| 588 | Design In-Memory File System | Algorithms | Hard | |
| 587 | Erect the Fence | Algorithms | Hard | |
| 583 | Delete Operation for Two Strings | Algorithms | Medium | |
| 582 | Kill Process | Algorithms | Medium | |
| 581 | Shortest Unsorted Continuous Subarray | Algorithms | Easy | |
| 580 | Count Student Number in Departments | Database | Medium | |
| 578 | Get Highest Answer Rate Question | Database | Medium | |
| 577 | Employee Bonus | Database | Easy | |
| 576 | Out of Boundary Paths | Algorithms | Medium | |
| 575 | Distribute Candies | Algorithms | Easy | |
| 573 | Squirrel Simulation | Algorithms | Medium | |
| 572 | Subtree of Another Tree | Algorithms | Easy | |
| 571 | Find Median Given Frequency of Numbers | Database | Easy | |
| 568 | Maximum Vacation Days | Algorithms | Hard | |
| 567 | Permutation in String | Algorithms | Medium | |
| 566 | Reshape the Matrix | Algorithms | Easy | |
| 565 | Array Nesting | Algorithms | Easy | |
| 564 | Find the Closest Palindrome | Algorithms | Hard | |
| 563 | Binary Tree Tilt | Algorithms | Easy | |
| 562 | Longest Line of Consecutive One in Matrix | Algorithms | Medium | |
| 561 | Array Partition I | Algorithms | Easy | |
| 560 | Subarray Sum Equals K | Algorithms | Medium | |
| 557 | Reverse Words in a String III | Algorithms | Easy | |
| 556 | Next Greater Element III | Algorithms | Medium | |
| 555 | Split Assembled Strings | Algorithms | Medium | |
| 554 | Brick Wall | Algorithms | Medium | |
| 553 | Optimal Division | Algorithms | Medium | |
| 552 | Student Attendance Record II | Algorithms | Hard | |
| 551 | Student Attendance Record I | Algorithms | Easy | |
| 549 | Binary Tree Longest Consecutive Sequence II | Algorithms | Medium | |
| 548 | Split Array with Equal Sum | Algorithms | Medium | |
| 547 | Friend Circles | Algorithms | Medium | |
| 546 | Remove Boxes | Algorithms | Hard | |
| 545 | Boundary of Binary Tree | Algorithms | Medium | |
| 544 | Output Contest Matches | Algorithms | Medium | |
| 543 | Diameter of Binary Tree | Algorithms | Easy | |
| 542 | 01 Matrix | Algorithms | Medium | |
| 541 | Reverse String II | Algorithms | Easy | |
| 540 | Single Element in a Sorted Array | Draft | Medium | |
| 539 | Minimum Time Difference | Algorithms | Medium | |
| 538 | Convert BST to Greater Tree | Algorithms | Easy | |
| 537 | Complex Number Multiplication | Algorithms | Medium | |
| 536 | Construct Binary Tree from String | Algorithms | Medium | |
| 533 | Lonely Pixel II | Algorithms | Medium | |
| 532 | K-diff Pairs in an Array | Algorithms | Easy | |
| 531 | Lonely Pixel I | Algorithms | Medium | |
| 530 | Minimum Absolute Difference in BST | Algorithms | Easy | |
| 529 | Minesweeper | Algorithms | Medium | |
| 527 | Word Abbreviation | Algorithms | Hard | |
| 526 | Beautiful Arrangement | Algorithms | Medium | |
| 525 | Contiguous Array | Algorithms | Medium | |
| 524 | Longest Word in Dictionary through Deleting | Algorithms | Medium | |
| 523 | Continuous Subarray Sum | Algorithms | Medium | |
| 522 | Longest Uncommon Subsequence II | Algorithms | Medium | |
| 521 | Longest Uncommon Subsequence I | Algorithms | Easy | |
| 520 | Detect Capital | Algorithms | Easy | |
| 518 | Coin Change 2 | Draft | Medium | |
| 517 | Super Washing Machines | Algorithms | Hard | |
| 516 | Longest Palindromic Subsequence | Algorithms | Medium | |
| 515 | Find Largest Element in Each Row | Algorithms | Medium | |
| 514 | Freedom Trail | Algorithms | Hard | |
| 513 | Find Left Most Element | Algorithms | Medium | |
| 508 | Most Frequent Subtree Sum | Algorithms | Medium | |
| 507 | Perfect Number | Algorithms | Easy | |
| 506 | Relative Ranks | Algorithms | Easy | |
| 504 | Base 7 | Algorithms | Easy | |
| 503 | Next Greater Element II | Algorithms | Medium | |
| 502 | IPO | Algorithms | Hard | |
| 501 | Find Mode in Binary Tree | Algorithms | Easy | |
| 500 | Keyboard Row | Algorithms | Easy | |
| 499 | The Maze II | Algorithms | Hard | |
| 498 | Diagonal Traverse | Algorithms | Hard | |
| 496 | Next Greater Element I | Algorithms | Easy | |
| 495 | Teemo Attacking | Algorithms | Medium | |
| 494 | Target sum | Algorithms | Medium | |
| 493 | Reverse Pairs | Algorithms | Hard | |
| 492 | Construct the rectangle | Algorithms | Easy | |
| 491 | Increasing Subsequences | Algorithms | Medium | |
| 488 | Zuma Game | Algorithms | Hard | |
| 487 | Max Consecutive Ones II | Algorithms | Medium | |
| 486 | Predict the Winner | Algorithms | Medium | |
| 485 | Max Consecutive Ones | Algorithms | Easy | |
| 484 | Find Permutation | Algorithms | Medium | |
| 483 | Smallest Good Base | Algorithms | Hard | |
| 482 | License Key Formatting | Algorithms | Medium | |
| 481 | Magical String | Algorithms | Medium | |
| 480 | Sliding Window Median | Algorithms | Hard | |
| 479 | Largest Palindrome Product | Draft | Easy | |
| 477 | Total Hamming Distance | Algorithms | Medium | |
| 476 | Number Complement | Algorithms | Easy | |
| 475 | Heaters | Algorithms | Easy | |
| 474 | Ones and Zeroes | Algorithms | Medium | |
| 473 | Matchsticks to Square | Algorithms | Medium | |
| 471 | Encode String with Shortest Length | Algorithms | Hard | |
| 469 | Convex Polygon | Algorithms | Medium | |
| 468 | Validate IP Address | Algorithms | Medium | |
| 467 | Unique Substrings in Wraparound String | Algorithms | Medium | |
| 466 | Count The Repetitions | Algorithms | Hard | |
| 465 | Optimal Account Balancing | Algorithms | Hard | |
| 464 | Can I Win | Algorithms | Medium | |
| 463 | Island Perimeter | Algorithms | Easy | |
| 462 | Minimum Moves to Equal Array Elements II | Algorithms | Medium | |
| 461 | Hamming Distance | Algorithms | Easy | |
| 460 | LFU Cache | Draft | Hard | |
| 459 | Repeated Substring Pattern | Algorithms | Easy | |
| 458 | Poor Pigs | Draft | Easy | |
| 457 | Circular Array Loop | Draft | Medium | |
| 456 | 132 Pattern | Algorithms | Medium | |
| 455 | Assign Cookies | Algorithms | Easy | |
| 454 | 4Sum II | Algorithms | Medium | |
| 453 | Minimum Moves to Equal Array Elements | Algorithms | Easy | |
| 452 | Minimum Number of Arrows to Burst Balloons | Algorithms | Medium | |
| 451 | Sort Characters By Frequency | Draft | Medium | |
| 450 | Delete Node in a BST | Draft | Medium | |
| 449 | Serialize and Deserialize BST | Draft | Medium | |
| 448 | Find All Numbers Disappeared in an Array | Draft | Medium | |
| 447 | Number of Boomerangs | Algorithms | Easy | |
| 446 | Arithmetic Slices II - Subsequence | Algorithms | Hard | |
| 445 | Add Two Numbers II | Draft | Medium | |
| 444 | Sequence Reconstruction | Algorithms | Medium | |
| 443 | String Compression | Algorithms | Easy | |
| 442 | Find All Duplicates in an Array | Draft | Medium | |
| 441 | Arranging Coins | Algorithms | Easy | |
| 440 | K-th Smallest in Lexicographical Order | Algorithms | Hard | |
| 439 | Ternary Expression Parser | Algorithms | Medium | |
| 438 | Find All Anagrams in a String | Algorithms | Easy | |
| 437 | Path Sum III | Algorithms | Easy | |
| 436 | Find Right Interval | Algorithms | Medium | |
| 435 | Non-overlapping Intervals | Algorithms | Medium | |
| 434 | Number of Segments in a String | Algorithms | Easy | |
| 433 | Minimum Genetic Mutation | Draft | Medium | |
| 432 | All O`one Data Structure | Draft | Hard | |
| 425 | Word Squares | Algorithms | Hard | |
| 424 | Longest Repeating Character Replacement | Algorithms | Medium | |
| 423 | Reconstruct Original Digits from English | Algorithms | Easy | |
| 422 | Valid Word Square | Algorithms | Easy | |
| 421 | Maximum XOR of Two Numbers in an Array | Algorithms | Medium | |
| 420 | Strong Password Checker | Algorithms | Hard | |
| 419 | Battleships in a board | Algorithms | Medium | |
| 418 | Sentence Screen Fitting | Algorithms | Hard | |
| 417 | Pacific Atlantic Water Flow | Algorithms | Medium | |
| 416 | Partition Equal Subset Sum | Algorithms | Medium | |
| 415 | Add Strings | Algorithms | Easy | |
| 414 | Third Maximum Number | Algorithms | Easy | |
| 413 | Arithmetic Slices | Algorithms | Easy | |
| 412 | Fizz Buzz | Algorithms | Easy | |
| 411 | Minimum Unique Word Abbreviation | Algorithms | Medium | |
| 410 | Split Array Largest Sum | Algorithms | Medium | |
| 409 | Longest Palindrome | Algorithms | Easy | |
| 408 | Valid Word Abbreviation | Algorithms | Easy | |
| 407 | Trapping Rain Water II | Algorithms | Hard | |
| 406 | Queue Reconstruction by Height | Algorithms | Medium | |
| 405 | Convert a Number to Hexadecimal | Algorithms | Easy | |
| 404 | Sum of Left Leaves | Algorithms | Easy | |
| 403 | Frog Jump | Algorithms | Hard | |
| 402 | Remove K Digits | Algorithms | Medium | |
| 401 | Binary Watch | Algorithms | Easy | |
| 400 | Nth Digit | Algorithms | Easy | |
| 399 | Evaluate Division | Algorithms | Medium | |
| 398 | Random Pick Index | Algorithms | Medium | |
| 397 | Integer Replacement | Algorithms | Easy | |
| 396 | Rotate Function | Algorithms | Easy | |
| 395 | Longest Substring with At Least K Repeating Characters | Algorithms | Medium | |
| 394 | Decode String | Algorithms | Medium | |
| 393 | UTF-8 Validation | Algorithms | Medium | |
| 392 | Is Subsequence | Algorithms | Medium | |
| 391 | Perfect Rectangle | Algorithms | Hard | |
| 390 | Elimination Game | Algorithms | Medium | |
| 389 | Find the Difference | Algorithms | Easy | |
| 388 | Longest Absolute File Path | Algorithms | Medium | |
| 387 | First Unique Character in a String | Algorithms | Easy | |
| 386 | Lexicographical Numbers | Algorithms | Medium | |
| 385 | Mini Parser | Algorithms | Medium | |
| 384 | Shuffle an Array | Algorithms | Easy | |
| 383 | Ransom Note | Algorithms | Easy | |
| 382 | Linked List Random Node | Algorithms | Medium | |
| 381 | Insert Delete GetRandom O(1) - Duplicates allowed | Algorithms | Medium | |
| 380 | Insert Delete GetRandom O(1) | Algorithms | Medium | |
| 378 | Kth Smallest Element in a Sorted Matrix | Algorithms | Medium | |
| 377 | Combination Sum IV | Algorithms | Medium | |
| 376 | Wiggle Subsequence | Algorithms | Medium | |
| 375 | Guess Number Higher or Lower II | Algorithms | Medium | |
| 374 | Guess Number Higher or Lower | Algorithms | Easy | |
| 373 | Find K Pairs with Smallest Sums | Algorithms | Medium | |
| 372 | Super Pow | Algorithms | Medium | |
| 371 | Sum of Two Integers | Algorithms | Easy | |
| 368 | Largest Divisible Subset | Algorithms | Medium | |
| 367 | Valid Perfect Square | Algorithms | Medium | |
| 365 | Water and Jug Problem | Algorithms | Medium | |
| 363 | Max Sum of Rectangle No Larger Than K | Algorithms | Medium | |
| 357 | Count Numbers with Unique Digits | Algorithms | Medium | |
| 355 | Design Twitter design-twitter | Algorithms | Hard | |
| 354 | Russian Doll Envelopes | Algorithms | Hard | |
| 352 | Data Stream as Disjoint Intervals | Algorithms | Hard | |
| 350 | Intersection of Two Arrays II | Algorithms | Easy | |
| 349 | Intersection of Two Arrays | Algorithms | Easy | |
| 347 | Top K Frequent Elements | Algorithms | Medium | |
| 345 | Reverse Vowels of a String | Algorithms | Easy | |
| 344 | Reverse String | Algorithms | Easy | |
| 343 | Integer Break | Algorithms | Medium | |
| 342 | Power of Four | Algorithms | Easy | |
| 341 | Flatten Nested List Iterator | Algorithms | Medium | |
| 338 | Counting Bits | Algorithms | Medium | |
| 337 | House Robber III | Algorithms | Medium | |
| 336 | Palindrome Pairs | Algorithms | Hard | |
| 335 | Self Crossing | Algorithms | Medium | |
| 334 | Increasing Triplet Subsequence | Algorithms | Medium | |
| 332 | Reconstruct Itinerary | Algorithms | Hard | |
| 331 | Verify Preorder Serialization of a Binary Tree | Algorithms | Medium | |
| 330 | Patching Array | Algorithms | Hard | |
| 329 | Longest Increasing Path in a Matrix | Algorithms | Medium | |
| 328 | Odd Even Linked List | Algorithms | Easy | |
| 327 | Count of Range Sum | Algorithms | Hard | |
| 326 | Power of Three | Algorithms | Easy | |
| 324 | Wiggle Sort II | Algorithms | Medium | |
| 322 | Coin Change | Algorithms | Medium | |
| 321 | Create Maximum Number | Algorithms | Hard | |
| 319 | Bulb Switcher | Algorithms | Medium | |
| 318 | Maximum Product of Word Lengths | Algorithms | Medium | |
| 316 | Remove Duplicate Letters | Algorithms | Medium | |
| 315 | Count of Smaller Numbers After Self | Algorithms | Hard | |
| 313 | Super Ugly Number | Algorithms | Medium | |
| 312 | Burst Balloons | Algorithms | Medium | |
| 310 | Minimum Height Trees | Algorithms | Medium | |
| 309 | Best Time to Buy and Sell Stock with Cooldown | Algorithms | Medium | |
| 307 | Range Sum Query - Mutable | Algorithms | Medium | |
| 306 | Additive Number | Algorithms | Medium | |
| 304 | Range Sum Query 2D - Immutable | Algorithms | Medium | |
| 303 | Range Sum Query - Immutable | Algorithms | Easy | |
| 301 | Remove Invalid Parentheses | Algorithms | Medium | |
| 300 | Longest Increasing Subsequence | Algorithms | Medium | |
| 299 | Bulls and Cows | Algorithms | Easy | |
| 297 | Serialize and Deserialize Binary Tree | Algorithms | Medium | |
| 295 | Find Median from Data Stream | Algorithms | Hard | |
| 292 | Nim Game | Algorithms | Easy | |
| 290 | Word Pattern | Algorithms | Easy | |
| 289 | Game of Life | Algorithms | Medium | |
| 287 | Find the Duplicate Number | Algorithms | Hard | |
| 284 | Peeking Iterator peeking-iterator | Algorithms | Medium | |
| 283 | Move Zeroes | Algorithms | Easy | |
| 282 | Expression Add Operators | Algorithms | Hard | |
| 279 | Perfect Squares | Algorithms | Medium | |
| 278 | First Bad Version | Algorithms | Easy | |
| 275 | H-Index II | Algorithms | Medium | |
| 274 | H-Index | Algorithms | Medium | |
| 273 | Integer to English Words | Algorithms | Medium | |
| 268 | Missing Number | Algorithms | Medium | |
| 264 | Ugly Number II | Algorithms | Medium | |
| 263 | Ugly Number | Algorithms | Easy | |
| 262 | Trips and Users | Database | Hard | |
| 260 | Single Number III | Algorithms | Medium | |
| 258 | Add Digits | Algorithms | Easy | |
| 257 | Binary Tree Paths | Algorithms | Easy | |
| 242 | Valid Anagram | Algorithms | Easy | |
| 241 | Different Ways to Add Parentheses | Algorithms | Medium | |
| 240 | Search a 2D Matrix II | Algorithms | Medium | |
| 239 | Sliding Window Maximum | Algorithms | Hard | |
| 238 | Product of Array Except Self | Algorithms | Medium | |
| 237 | Delete Node in a Linked List | Algorithms | Easy | |
| 236 | Lowest Common Ancestor of a Binary Tree | Algorithms | Medium | |
| 235 | Lowest Common Ancestor of a Binary Search Tree | Algorithms | Easy | |
| 234 | Palindrome Linked List | Algorithms | Easy | |
| 233 | Number of Digit One | Algorithms | Medium | |
| 232 | Implement Queue using Stacks | Algorithms | Easy | |
| 231 | Power of Two | Algorithms | Easy | |
| 230 | Kth Smallest Element in a BST | Algorithms | Medium | |
| 229 | Majority Element II | Algorithms | Medium | |
| 228 | Summary Ranges | Algorithms | Easy | |
| 227 | Basic Calculator II | Algorithms | Medium | |
| 226 | Invert Binary Tree | Algorithms | Easy | |
| 225 | Implement Stack using Queues | Algorithms | Easy | |
| 224 | Basic Calculator | Algorithms | Medium | |
| 223 | Rectangle Area | Algorithms | Easy | |
| 222 | Count Complete Tree Nodes | Algorithms | Medium | |
| 221 | Maximal Square | Algorithms | Medium | |
| 220 | Contains Duplicate III | Algorithms | Medium | |
| 219 | Contains Duplicate II | Algorithms | Easy | |
| 218 | The Skyline Problem | Algorithms | Hard | |
| 217 | Contains Duplicate | Algorithms | Easy | |
| 216 | Combination Sum III | Algorithms | Medium | |
| 215 | Kth Largest Element in an Array | Algorithms | Medium | |
| 214 | Shortest Palindrome | Algorithms | Hard | |
| 213 | House Robber II | Algorithms | Medium | |
| 212 | Word Search II | Algorithms | Hard | |
| 211 | Add and Search Word - Data structure design | Algorithms | Medium | |
| 210 | Course Schedule II | Algorithms | Medium | |
| 209 | Minimum Size Subarray Sum | Algorithms | Medium | |
| 208 | Implement Trie (Prefix Tree) | Algorithms | Medium | |
| 207 | Course Schedule | Algorithms | Medium | |
| 206 | Reverse Linked List | Algorithms | Easy | |
| 205 | Isomorphic Strings | Algorithms | Easy | |
| 204 | Count Primes | Algorithms | Easy | |
| 203 | Remove Linked List Elements | Algorithms | Easy | |
| 202 | Happy Number | Algorithms | Easy | |
| 201 | Bitwise AND of Numbers Range | Algorithms | Medium | |
| 200 | Number of Islands | Algorithms | Medium | |
| 199 | Binary Tree Right Side View | Algorithms | Medium | |
| 198 | House Robber | Algorithms | Easy | |
| 197 | Rising Temperature | Database | Easy | |
| 196 | Delete Duplicate Emails | Database | Easy | |
| 195 | Tenth Line | Shell | Easy | |
| 194 | Transpose File | Shell | Medium | |
| 193 | Valid Phone Numbers | Shell | Easy | |
| 192 | Word Frequency | Shell | Medium | |
| 191 | Number of 1 Bits | Algorithms | Easy | |
| 190 | Reverse Bits | Algorithms | Easy | |
| 189 | Rotate Array | Algorithms | Easy | |
| 188 | Best Time to Buy and Sell Stock IV | Algorithms | Hard | |
| 187 | Repeated DNA Sequences | Algorithms | Medium | |
| 185 | Department Top Three Salaries | Database | Hard | |
| 184 | Department Highest Salary | Database | Medium | |
| 183 | Customers Who Never Order | Database | Easy | |
| 182 | Duplicate Emails | Database | Easy | |
| 181 | Employees Earning More Than Their Managers | Database | Easy | |
| 180 | Consecutive Numbers | Database | Medium | |
| 179 | Largest Number | Algorithms | Medium | |
| 178 | Rank Scores | Database | Medium | |
| 177 | Nth Highest Salary | Database | Medium | |
| 176 | Second Highest Salary | Database | Easy | |
| 175 | Combine Two Tables | Database | Easy | |
| 174 | Dungeon Game | Algorithms | Hard | |
| 173 | Binary Search Tree Iterator | Algorithms | Medium | |
| 172 | Factorial Trailing Zeroes | Algorithms | Easy | |
| 171 | Excel Sheet Column Number | Algorithms | Easy | |
| 169 | Majority Element | Algorithms | Easy | |
| 168 | Excel Sheet Column Title | Algorithms | Easy | |
| 166 | Fraction to Recurring Decimal | Algorithms | Medium | |
| 165 | Compare Version Numbers | Algorithms | Easy | |
| 164 | Maximum Gap | Algorithms | Hard | |
| 162 | Find Peak Element | Algorithms | Medium | |
| 160 | Intersection of Two Linked Lists | Algorithms | Easy | |
| 155 | Min Stack | Algorithms | Easy | |
| 154 | Find Minimum in Rotated Sorted Array II | Algorithms | Hard | |
| 153 | Find Minimum in Rotated Sorted Array | Algorithms | Medium | |
| 152 | Maximum Product Subarray | Algorithms | Medium | |
| 151 | Reverse Words in a String | Algorithms | Medium | |
| 150 | Evaluate Reverse Polish Notation | Algorithms | Medium | |
| 149 | Max Points on a Line | Algorithms | Easy | |
| 148 | Sort List | Algorithms | Medium | |
| 147 | Insertion Sort List | Algorithms | Medium | |
| 146 | LRU Cache | Algorithms | Hard | |
| 145 | Binary Tree Postorder Traversal | Algorithms | Hard | |
| 144 | Binary Tree Preorder Traversal | Algorithms | Medium | |
| 143 | Reorder List | Algorithms | Medium | |
| 142 | Linked List Cycle II | Algorithms | Medium | |
| 141 | Linked List Cycle | Algorithms | Medium | |
| 140 | Word Break II | Algorithms | Hard | |
| 139 | Word Break | Algorithms | Medium | |
| 138 | Copy List with Random Pointer | Algorithms | Hard | |
| 136 | Single Number | Algorithms | Medium | |
| 135 | Candy | Algorithms | Hard | |
| 134 | Gas Station | Algorithms | Medium | |
| 133 | Clone Graph | Algorithms | Medium | |
| 129 | Sum Root to Leaf Numbers | Algorithms | Medium | |
| 127 | Word Ladder | Algorithms | Medium | |
| 124 | Binary Tree Maximum Path Sum | Algorithms | Hard | |
| 122 | Best Time to Buy and Sell Stock II | Algorithms | Medium | |
| 114 | Flatten Binary Tree to Linked List | Algorithms | Medium | |
| 111 | Minimum Depth of Binary Tree | Algorithms | Easy | |
| 100 | Same Tree | Algorithms | Easy | |
| 94 | Binary Tree Inorder Traversal | Algorithms | Medium | |
| 92 | Reverse Linked List II | Algorithms | Medium | |
| 79 | Word Search | Algorithms | Medium | |
| 70 | Climbing Stairs | Algorithms | Easy | |
| 69 | Sqrt(x) | Algorithms | Medium | |
| 62 | Unique Paths | Algorithms | Medium | |
| 49 | Anagrams | Algorithms | Medium | |
| 46 | Permutations | Algorithms | Medium | |
| 41 | First Missing Positive | Algorithms | Hard | |
| 31 | Next Permutation | Algorithms | Medium | |
| 30 | Substring with Concatenation of All Words | Algorithms | Hard | |
| 8 | String to Integer (atoi) | Algorithms | Easy | |
| 6 | ZigZag Conversion | Algorithms | Easy | |
| 4 | Median of Two Sorted Arrays | Algorithms | Hard | |
| 3 | Longest Substring Without Repeating Characters | Algorithms | Medium | |
| 2 | Add Two Numbers | Algorithms | Medium | |
| 1 | Two Sum | Algorithms | Medium |