A list of LeetCode questions with the corresponding companies sorted by difficulty level.
| ID | Name | Difficulty.Level | Companies |
|---|---|---|---|
| 717 | 1-bit and 2-bit Characters | Easy | |
| 67 | Add Binary | Easy | Adobe, Amazon, Facebook, Google, Microsoft |
| 258 | Add Digits | Easy | Adobe, Apple |
| 415 | Add Strings | Easy | Apple, Facebook, Google, Microsoft |
| 637 | Average of Levels in Binary Tree | Easy | Amazon, Facebook |
| 844 | Backspace String Compare | Easy | |
| 110 | Balanced Binary Tree | Easy | Amazon, Google |
| 682 | Baseball Game | Easy | Amazon |
| 121 | Best Time to Buy and Sell Stock | Easy | |
| 122 | Best Time to Buy and Sell Stock II | Easy | Alibaba |
| 595 | Big Countries | Easy | Adobe, Amazon, Google |
| 704 | Binary Search | Easy | |
| 107 | Binary Tree Level Order Traversal II | Easy | Microsoft |
| 257 | Binary Tree Paths | Easy | Amazon, Facebook, Microsoft |
| 859 | Buddy Strings | Easy | |
| 70 | Climbing Stairs | Easy | Adobe, Alibaba, Amazon, Apple, Facebook, Microsoft |
| 270 | Closest Binary Search Tree Value | Easy | |
| 175 | Combine Two Tables | Easy | Adobe, Amazon, Apple, Facebook, Google |
| 427 | Construct Quad Tree | Easy | Apple |
| 217 | Contains Duplicate | Easy | Amazon |
| 219 | Contains Duplicate II | Easy | Adobe, Google |
| 405 | Convert a Number to Hexadecimal | Easy | |
| 538 | Convert BST to Greater Tree | Easy | Amazon |
| 108 | Convert Sorted Array to Binary Search Tree | Easy | Adobe, Apple |
| 38 | Count and Say | Easy | Adobe, Amazon, Google, Microsoft |
| 696 | Count Binary Substrings | Easy | Adobe |
| 204 | Count Primes | Easy | Adobe, Amazon, Apple, Google, Microsoft |
| 183 | Customers Who Never Order | Easy | Amazon |
| 237 | Delete Node in a Linked List | Easy | Apple |
| 706 | Design HashMap | Easy | Adobe, Amazon, Apple, Microsoft |
| 707 | Design Linked List | Easy | Amazon |
| 543 | Diameter of Binary Tree | Easy | Adobe |
| 690 | Employee Importance | Easy | |
| 181 | Employees Earning More Than Their Managers | Easy | Amazon, Facebook |
| 171 | Excel Sheet Column Number | Easy | Akuna Capital |
| 168 | Excel Sheet Column Title | Easy | Akuna Capital |
| 172 | Factorial Trailing Zeroes | Easy | Adobe, Microsoft |
| 509 | Fibonacci Number | Easy | Adobe, Amazon, Microsoft |
| 438 | Find All Anagrams in a String | Easy | Amazon, Facebook, Google |
| 448 | Find All Numbers Disappeared in an Array | Easy | Apple |
| 760 | Find Anagram Mappings | Easy | |
| 724 | Find Pivot Index | Easy | Amazon, Apple, Facebook, Google, Microsoft |
| 997 | Find the Town Judge | Easy | Amazon |
| 278 | First Bad Version | Easy | Facebook, Google |
| 387 | First Unique Character in a String | Easy | Amazon, Apple, Facebook, Google, Microsoft |
| 412 | Fizz Buzz | Easy | Apple |
| 832 | Flipping an Image | Easy | |
| 733 | Flood Fill | Easy | Amazon, Google |
| 597 | Friend Requests I: Overall Acceptance Rate | Easy | |
| 824 | Goat Latin | Easy | |
| 374 | Google - LeetCodeGuess Number Higher or Lower | Easy | |
| 933 | Google - LeetCodeNumber of Recent Calls | Easy | |
| 572 | Google - LeetCodeSubtree of Another Tree | Easy | |
| 202 | Happy Number | Easy | Amazon, Apple, Facebook |
| 475 | Heaters | Easy | |
| 198 | House Robber | Easy | Adobe, Amazon, Apple, Facebook, Google, Microsoft |
| 661 | Image Smoother | Easy | Apple |
| 232 | Implement Queue using Stacks | Easy | Apple, Microsoft |
| 225 | Implement Stack using Queues | Easy | Microsoft |
| 28 | Implement strStr | Easy | Adobe, Amazon, Apple, Facebook, Google, Microsoft |
| 897 | Increasing Order Search Tree | Easy | |
| 349 | Intersection of Two Arrays | Easy | Amazon, Apple, Facebook, Google, Microsoft |
| 350 | Intersection of Two Arrays II | Easy | Amazon |
| 160 | Intersection of Two Linked Lists | Easy | Amazon |
| 226 | Invert Binary Tree | Easy | Adobe, Amazon, Facebook |
| 751 | IP to CIDR | Easy | Airbnb |
| 463 | Island Perimeter | Easy | Amazon, Apple, Facebook, Google |
| 205 | Isomorphic Strings | Easy | Amazon, Google |
| 771 | Jewels and Stones | Easy | Adobe, Alibaba, Amazon, Apple, Google |
| 532 | K-diff Pairs in an Array | Easy | Amazon |
| 703 | Kth Largest Element in a Stream | Easy | Amazon, Facebook, Google |
| 872 | Leaf-Similar Trees | Easy | Facebook, Google |
| 860 | Lemonade Change | Easy | Amazon |
| 58 | Length of Last Word | Easy | Adobe |
| 784 | Letter Case Permutation | Easy | Microsoft |
| 482 | License Key Formatting | Easy | Amazon, Google |
| 141 | Linked List Cycle | Easy | Adobe, Akuna Capital, Alibaba, Amazon, Apple, Facebook, Google, Microsoft |
| 359 | Logger Rate Limiter | Easy | Facebook, Google |
| 14 | Longest Common Prefix | Easy | Adobe, Apple, Google, Microsoft |
| 674 | Longest Continuous Increasing Subsequence | Easy | |
| 409 | Longest Palindrome | Easy | Amazon |
| 687 | Longest Univalue Path | Easy | Amazon |
| 720 | Longest Word in Dictionary | Easy | Amazon, Google |
| 235 | Lowest Common Ancestor of a Binary Search Tree | Easy | Adobe |
| 840 | Magic Squares In Grid | Easy | |
| 169 | Majority Element | Easy | Adobe, Amazon, Apple, Google, Microsoft |
| 485 | Max Consecutive Ones | Easy | Amazon |
| 716 | Max Stack | Easy | |
| 849 | Maximize Distance to Closest Person | Easy | |
| 104 | Maximum Depth of Binary Tree | Easy | Apple, Facebook, Google |
| 559 | Maximum Depth of N-ary Tree | Easy | Amazon, Google |
| 628 | Maximum Product of Three Numbers | Easy | Amazon, Facebook |
| 53 | Maximum Subarray | Easy | Adobe, Alibaba, Amazon, Apple, Facebook, Microsoft |
| 252 | Meeting Rooms | Easy | Amazon, Facebook |
| 88 | Merge Sorted Array | Easy | Adobe, Amazon, Facebook, Microsoft |
| 617 | Merge Two Binary Trees | Easy | Amazon |
| 21 | Merge Two Sorted Lists | Easy | Airbnb, Alibaba |
| 746 | Min Cost Climbing Stairs | Easy | Amazon |
| 155 | Min Stack | Easy | Adobe, Amazon, Apple, Facebook, Google, Microsoft |
| 111 | Minimum Depth of Binary Tree | Easy | Adobe, Amazon, Microsoft |
| 783 | Minimum Distance Between BST Nodes | Easy | Amazon |
| 599 | Minimum Index Sum of Two Lists | Easy | Amazon |
| 268 | Missing Number | Easy | Adobe, Amazon, Apple |
| 896 | Monotonic Array | Easy | |
| 819 | Most Common Word | Easy | Amazon, Google, Microsoft |
| 283 | Move Zeroes | Easy | Adobe, Apple, Facebook, Google, Microsoft |
| 346 | Moving Average from Data Stream | Easy | |
| 429 | N-ary Tree Level Order Traversal | Easy | |
| 339 | Nested List Weight Sum | Easy | Amazon |
| 496 | Next Greater Element I | Easy | Amazon, Google |
| 665 | Non-decreasing Array | Easy | |
| 400 | Nth Digit | Easy | Adobe, Google |
| 476 | Number Complement | Easy | |
| 191 | Number of 1 Bits | Easy | Amazon, Apple, Google, Microsoft |
| 447 | Number of Boomerangs | Easy | Amazon, Google |
| 806 | Number of Lines To Write String | Easy | |
| 1013 | Pairs of Songs With Total Durations Divisible by 60 | Easy | Amazon |
| 234 | Palindrome Linked List | Easy | Amazon, Google |
| 9 | Palindrome Number | Easy | Adobe, Alibaba, Amazon, Apple, Facebook, Google, Microsoft |
| 266 | Palindrome Permutation | Easy | Amazon, Facebook, Google, Microsoft |
| 118 | Pascal's Triangle | Easy | Amazon, Facebook, Google, Microsoft |
| 119 | Pascal's Triangle II | Easy | Adobe, Amazon, Google |
| 112 | Path Sum | Easy | Amazon |
| 437 | Path Sum III | Easy | Amazon, Facebook |
| 852 | Peak Index in a Mountain Array | Easy | Amazon, Google |
| 507 | Perfect Number | Easy | Amazon |
| 66 | Plus One | Easy | Amazon, Facebook, Google, Microsoft |
| 830 | Positions of Large Groups | Easy | Adobe, Google |
| 326 | Power of Three | Easy | Apple |
| 231 | Power of Two | Easy | Amazon |
| 157 | Read N Characters Given Read4 | Easy | Facebook, Google |
| 836 | Rectangle Overlap | Easy | Adobe, Amazon, Microsoft |
| 26 | Remove Duplicates from Sorted Array | Easy | Amazon, Apple, Facebook, Google, Microsoft |
| 83 | Remove Duplicates from Sorted List | Easy | Apple, Google |
| 27 | Remove Element | Easy | Amazon, Google |
| 203 | Remove Linked List Elements | Easy | Adobe, Amazon, Microsoft |
| 937 | Reorder Log Files | Easy | Amazon |
| 686 | Repeated String Match | Easy | Facebook, Google |
| 190 | Reverse Bits | Easy | Amazon, Apple |
| 7 | Reverse Integer | Easy | Adobe, Alibaba, Amazon, Facebook, Google, Microsoft |
| 206 | Reverse Linked List | Easy | Adobe, Alibaba, Facebook, Google, Microsoft |
| 917 | Reverse Only Letters | Easy | Microsoft |
| 344 | Reverse String | Easy | Adobe, Amazon, Apple, Facebook, Google, Microsoft |
| 541 | Reverse String II | Easy | Microsoft |
| 557 | Reverse Words in a String III | Easy | Apple, Microsoft |
| 657 | Robot Return to Origin | Easy | Adobe, Amazon |
| 13 | Roman to Integer | Easy | Adobe, Amazon, Apple, Facebook, Google, Microsoft |
| 189 | Rotate Array | Easy | Amazon |
| 796 | Rotate String | Easy | Amazon |
| 788 | Rotated Digits | Easy | |
| 100 | Same Tree | Easy | Amazon, Apple, Facebook, Google |
| 700 | Search in a Binary Search Tree | Easy | |
| 35 | Search Insert Position | Easy | Adobe |
| 176 | Second Highest Salary | Easy | Adobe, Apple |
| 671 | Second Minimum Node In a Binary Tree | Easy | Microsoft |
| 734 | Sentence Similarity | Easy | |
| 821 | Shortest Distance to a Character | Easy | |
| 243 | Shortest Word Distance | Easy | Amazon, Google |
| 800 | Similar RGB Color | Easy | |
| 136 | Single Number | Easy | Amazon |
| 905 | Sort Array By Parity | Easy | Adobe, Amazon, Google, Microsoft |
| 69 | Sqrt(x) | Easy | Amazon, Apple, Facebook, Google, Microsoft |
| 977 | Squares of a Sorted Array | Easy | Adobe |
| 443 | String Compression | Easy | Amazon |
| 246 | Strobogrammatic Number | Easy | Facebook, Google |
| 811 | Subdomain Visit Count | Easy | |
| 404 | Sum of Left Leaves | Easy | Amazon |
| 1022 | Sum of Root To Leaf Binary Numbers | Easy | Amazon |
| 371 | Sum of Two Integers | Easy | Facebook, Microsoft |
| 101 | Symmetric Tree | Easy | Amazon, Apple, Facebook, Google, Microsoft |
| 195 | Tenth Line | Easy | Adobe, Apple, Google |
| 414 | Third Maximum Number | Easy | Facebook, Google, Microsoft |
| 709 | To Lower Case | Easy | Adobe, Amazon, Apple |
| 766 | Toeplitz Matrix | Easy | Facebook, Google |
| 669 | Trim a Binary Search Tree | Easy | Amazon |
| 1 | Two Sum | Easy | Adobe, Aetion, Affirm, Airbnb, Alibaba, Amazon, Apple, Facebook, Google, Microsoft |
| 167 | Two Sum II - Input array is sorted | Easy | Adobe, Amazon, Apple, Facebook, Google, Microsoft |
| 170 | Two Sum III - Data structure design | Easy | |
| 653 | Two Sum IV - Input is a BST | Easy | |
| 263 | Ugly Number | Easy | Adobe |
| 929 | Unique Email Addresses | Easy | Adobe, Amazon, Apple, Google, Microsoft |
| 804 | Unique Morse Code Words | Easy | Apple |
| 242 | Valid Anagram | Easy | Amazon, Apple, Facebook, Google, Microsoft |
| 941 | Valid Mountain Array | Easy | |
| 125 | Valid Palindrome | Easy | Amazon, Apple, Facebook, Google, Microsoft |
| 680 | Valid Palindrome II | Easy | |
| 20 | Valid Parentheses | Easy | Adobe, Akuna Capital, Amazon, Apple, Facebook, Google, Microsoft |
| 193 | Valid Phone Numbers | Easy | Adobe |
| 953 | Verifying an Alien Dictionary | Easy | |
| 290 | Word Pattern | Easy | Google, Microsoft |
| 914 | X of a Kind in a Deck of Cards | Easy | |
| 542 | 01 Matrix | Medium | |
| 15 | 3Sum | Medium | Adobe, Akuna Capital, Amazon, Apple, Google, Microsoft, Alibaba |
| 16 | 3Sum Closest | Medium | Amazon, Apple, Google, Microsoft |
| 259 | 3Sum Smaller | Medium | |
| 18 | 4Sum | Medium | Adobe, Amazon, Apple, Facebook |
| 454 | 4Sum II | Medium | Amazon |
| 721 | Accounts Merge | Medium | Facebook, Google |
| 211 | Add and Search Word - Data structure design | Medium | |
| 616 | Add Bold Tag in String | Medium | |
| 2 | Add Two Numbers | Medium | Adobe, Aetion, Airbnb, Alibaba, Amazon, Apple, Facebook, Google |
| 445 | Add Two Numbers II | Medium | Facebook, Amazon |
| 863 | All Nodes Distance K in Binary Tree | Medium | Amazon, Google, Microsoft |
| 797 | All Paths From Source to Target | Medium | Amazon |
| 894 | All Possible Full Binary Trees | Medium | |
| 351 | Android Unlock Patterns | Medium | |
| 227 | Basic Calculator II | Medium | Amazon, Apple, Facebook, Google, Microsoft |
| 419 | Battleships in a Board | Medium | Facebook, Google, Microsoft |
| 714 | Best Time to Buy and Sell Stock with Transaction Fee | Medium | |
| 173 | Binary Search Tree Iterator | Medium | |
| 94 | Binary Tree Inorder Traversal | Medium | Adobe, Google, Microsoft |
| 102 | Binary Tree Level Order Traversal | Medium | Apple, Google |
| 298 | Binary Tree Longest Consecutive Sequence | Medium | |
| 549 | Binary Tree Longest Consecutive Sequence II | Medium | |
| 144 | Binary Tree Preorder Traversal | Medium | |
| 199 | Binary Tree Right Side View | Medium | Adobe, Google, Amazon |
| 314 | Binary Tree Vertical Order Traversal | Medium | Microsoft |
| 103 | Binary Tree Zigzag Level Order Traversal | Medium | Adobe, Google |
| 201 | Bitwise AND of Numbers Range | Medium | Adobe |
| 881 | Boats to Save People | Medium | |
| 361 | Bomb Enemy | Medium | Amazon, Google |
| 545 | Boundary of Binary Tree | Medium | Amazon |
| 554 | Brick Wall | Medium | |
| 319 | Bulb Switcher | Medium | |
| 299 | Bulls and Cows | Medium | Amazon, Google |
| 464 | Can I Win | Medium | |
| 723 | Candy Crush | Medium | |
| 1011 | Capacity To Ship Packages Within D Days | Medium | |
| 853 | Car Fleet | Medium | |
| 799 | Champagne Tower | Medium | |
| 787 | Cheapest Flights Within K Stops | Medium | Airbnb, Microsoft |
| 958 | Check Completeness of a Binary Tree | Medium | Facebook, Microsoft |
| 457 | Circular Array Loop | Medium | |
| 133 | Clone Graph | Medium | Amazon, Facebook |
| 742 | Closest Leaf in a Binary Tree | Medium | |
| 322 | Coin Change | Medium | Adobe, Airbnb, Amazon, Apple, Facebook, Microsoft |
| 518 | Coin Change 2 | Medium | Amazon, Facebook, Google, Microsoft |
| 39 | Combination Sum | Medium | Airbnb, Apple, Facebook, Google, Microsoft |
| 40 | Combination Sum II | Medium | Microsoft |
| 377 | Combination Sum IV | Medium | |
| 77 | Combinations | Medium | Facebook, Google, Microsoft |
| 165 | Compare Version Numbers | Medium | Amazon, Apple, Microsoft |
| 180 | Consecutive Numbers | Medium | |
| 1008 | Construct Binary Search Tree from Preorder | Medium | |
| 106 | Construct Binary Tree from Inorder and Postorder | Medium | Microsoft |
| 105 | Construct Binary Tree from Preorder and Inorder | Medium | |
| 889 | Construct Binary Tree from Preorder and PostorderTraversal | Medium | Facebook, Google |
| 536 | Construct Binary Tree from String | Medium | |
| 11 | Container With Most Water | Medium | Airbnb, Alibaba |
| 523 | Continuous Subarray Sum | Medium | Facebook, Microsoft |
| 426 | Convert Binary Search Tree to Sorted Doubly LinkedList | Medium | Facebook, Google, Microsoft |
| 109 | Convert Sorted List to Binary Search Tree | Medium | Facebook, Microsoft |
| 138 | Copy List with Random Pointer | Medium | Alibaba, Facebook |
| 222 | Count Complete Tree Nodes | Medium | Facebook, Google |
| 250 | Count Univalue Subtrees | Medium | Amazon |
| 338 | Counting Bits | Medium | Apple |
| 207 | Course Schedule | Medium | Amazon, Facebook, Google, Microsoft |
| 210 | Course Schedule II | Medium | Amazon, Facebook, Google, Microsoft |
| 791 | Custom Sort String | Medium | Amazon, Facebook |
| 739 | Daily Temperatures | Medium | Amazon, Google, Microsoft |
| 394 | Decode String | Medium | Amazon, appdynamics, Apple, Facebook, Google, Microsoft |
| 91 | Decode Ways | Medium | Adobe, Amazon, Apple, Facebook, Google, Microsoft |
| 450 | Delete Node in a BST | Medium | |
| 583 | Delete Operation for Two Strings | Medium | Amazon |
| 184 | Department Highest Salary | Medium | Amazon |
| 622 | Design Circular Queue | Medium | Amazon, Facebook |
| 362 | Design Hit Counter | Medium | Amazon, Google, Microsoft |
| 635 | Design Log Storage System | Medium | |
| 379 | Design Phone Directory | Medium | |
| 353 | Design Snake Game | Medium | Apple, Amazon, Google |
| 348 | Design Tic-Tac-Toe | Medium | Apple, Facebook, Microsoft |
| 498 | Diagonal Traverse | Medium | Facebook, Google |
| 241 | Different Ways to Add Parentheses | Medium | |
| 979 | Distribute Coins in Binary Tree | Medium | Amazon, Google, Microsoft |
| 29 | Divide Two Integers | Medium | Adobe, Amazon, Facebook, Google, Microsoft |
| 271 | Encode and Decode Strings | Medium | |
| 535 | Encode and Decode TinyURL | Medium | Adobe |
| 663 | Equal Tree Partition | Medium | |
| 399 | Evaluate Division | Medium | Adobe, Amazon, Facebook, Google |
| 150 | Evaluate Reverse Polish Notation | Medium | Microsoft |
| 855 | Exam Room | Medium | |
| 626 | Exchange Seats | Medium | Amazon |
| 636 | Exclusive Time of Functions | Medium | Microsoft |
| 809 | Expressive Words | Medium | |
| 442 | Find All Duplicates in an Array | Medium | Amazon, Microsoft |
| 833 | Find And Replace in String | Medium | |
| 890 | Find and Replace Pattern | Medium | Apple |
| 609 | Find Duplicate File in System | Medium | Amazon |
| 652 | Find Duplicate Subtrees | Medium | |
| 34 | Find First and Last Position of Element in Sorted | Medium | |
| 658 | Find K Closest Elements | Medium | |
| 373 | Find K Pairs with Smallest Sums | Medium | Amazon, Apple, Google, Microsoft |
| 366 | Find Leaves of Binary Tree | Medium | Amazon, Google |
| 153 | Find Minimum in Rotated Sorted Array | Medium | |
| 162 | Find Peak Element | Medium | Amazon, Facebook, Microsoft, Google |
| 277 | Find the Celebrity | Medium | Amazon, Facebook, Microsoft |
| 287 | Find the Duplicate Number | Medium | Adobe, Amazon, Google, Microsoft |
| 251 | Flatten 2D Vector | Medium | Airbnb |
| 430 | Flatten a Multilevel Doubly Linked List | Medium | Amazon |
| 114 | Flatten Binary Tree to Linked List | Medium | Adobe, Amazon, Microsoft |
| 341 | Flatten Nested List Iterator | Medium | Airbnb |
| 951 | Flip Equivalent Binary Trees | Medium | |
| 294 | Flip Game II | Medium | |
| 926 | Flip String to Monotone Increasing | Medium | |
| 166 | Fraction to Recurring Decimal | Medium | |
| 547 | Friend Circles | Medium | Amazon, Facebook, Microsoft |
| 825 | Friends Of Appropriate Ages | Medium | |
| 904 | Fruit Into Baskets | Medium | Amazon, Google |
| 289 | Game of Life | Medium | Amazon, Microsoft |
| 134 | Gas Station | Medium | Amazon, Google, Microsoft |
| 320 | Generalized Abbreviation | Medium | |
| 22 | Generate Parentheses | Medium | Adobe, Aetion |
| 478 | Generate Random Point in a Circle | Medium | |
| 129 | Google - LeetCodeSum Root to Leaf Numbers | Medium | |
| 261 | Graph Valid Tree | Medium | Amazon, Google |
| 89 | Gray Code | Medium | |
| 49 | Group Anagrams | Medium | Adobe, Affirm, Alibaba, Amazon, Apple, Facebook, Google, Microsoft |
| 249 | Group Shifted Strings | Medium | Apple |
| 375 | Guess Number Higher or Lower II | Medium | |
| 274 | H-Index | Medium | |
| 846 | Hand of Straights | Medium | |
| 337 | House Robber III | Medium | Amazon, Facebook, Google |
| 835 | Image Overlap | Medium | |
| 676 | Implement Magic Dictionary | Medium | |
| 470 | Implement Rand10 Using Rand7 | Medium | |
| 208 | Implement Trie (Prefix Tree) | Medium | Amazon |
| 491 | Increasing Subsequences | Medium | |
| 334 | Increasing Triplet Subsequence | Medium | Amazon, Google, Facebook |
| 285 | Inorder Successor in BST | Medium | Facebook, Microsoft |
| 510 | Inorder Successor in BST II | Medium | |
| 380 | Insert Delete GetRandom O(1) | Medium | Microsoft |
| 701 | Insert into a Binary Search Tree | Medium | Microsoft |
| 708 | Insert into a Cyclic Sorted List | Medium | Amazon, Facebook, Google, Microsoft |
| 343 | Integer Break | Medium | |
| 397 | Integer Replacement | Medium | Amazon |
| 12 | Integer to Roman | Medium | Adobe, Amazon, Apple, Google, Microsoft |
| 986 | Interval List Intersections | Medium | Facebook, Google |
| 785 | Is Graph Bipartite? | Medium | Amazon, Apple, Facebook, Google, Microsoft |
| 392 | Is Subsequence | Medium | Facebook, Google |
| 55 | Jump Game | Medium | Amazon, Apple, Facebook, Google, Microsoft |
| 973 | K Closest Points to Origin | Medium | Amazon, Apple, Facebook, Google, Microsoft |
| 841 | Keys and Rooms | Medium | Amazon |
| 582 | Kill Process | Medium | Apple |
| 935 | Knight Dialer | Medium | Facebook, Microsoft |
| 688 | Knight Probability in Chessboard | Medium | Facebook, Google, Microsoft |
| 215 | Kth Largest Element in an Array | Medium | |
| 230 | Kth Smallest Element in a BST | Medium | Amazon |
| 378 | Kth Smallest Element in a Sorted Matrix | Medium | Apple |
| 333 | Largest BST Subtree | Medium | Amazon, Google, Microsoft |
| 368 | Largest Divisible Subset | Medium | Adobe, Google |
| 179 | Largest Number | Medium | Amazon, Apple |
| 17 | Letter Combinations of a Phone Number | Medium | Airbnb, Apple, Facebook |
| 386 | Lexicographical Numbers | Medium | |
| 817 | Linked List Components | Medium | |
| 142 | Linked List Cycle II | Medium | Apple, Google, Microsoft |
| 382 | Linked List Random Node | Medium | Apple, Facebook |
| 388 | Longest Absolute File Path | Medium | |
| 300 | Longest Increasing Subsequence | Medium | Adobe, Airbnb, Amazon, Apple, Facebook, Google, Microsoft |
| 562 | Longest Line of Consecutive One in Matrix | Medium | |
| 845 | Longest Mountain in Array | Medium | |
| 516 | Longest Palindromic Subsequence | Medium | Apple, Microsoft |
| 5 | Longest Palindromic Substring | Medium | Alibaba |
| 424 | Longest Repeating Character Replacement | Medium | |
| 395 | Longest Substring with At Least K RepeatingCharacters | Medium | Facebook, Google |
| 3 | Longest Substring Without Repeating Characters | Medium | Akuna Capital, Alibaba |
| 978 | Longest Turbulent Subarray | Medium | Amazon |
| 524 | Longest Word in Dictionary through Deleting | Medium | |
| 236 | Lowest Common Ancestor of a Binary Tree | Medium | |
| 229 | Majority Element II | Medium | Amazon |
| 695 | Max Area of Island | Medium | Adobe, Affirm, Alibaba, Amazon, Facebook, Google, Microsoft |
| 769 | Max Chunks To Make Sorted | Medium | |
| 487 | Max Consecutive Ones II | Medium | |
| 1004 | Max Consecutive Ones III | Medium | |
| 807 | Max Increase to Keep City Skyline | Medium | |
| 221 | Maximal Square | Medium | |
| 654 | Maximum Binary Tree | Medium | Amazon |
| 318 | Maximum Product of Word Lengths | Medium | |
| 152 | Maximum Product Subarray | Medium | Adobe |
| 325 | Maximum Size Subarray Sum Equals k | Medium | |
| 918 | Maximum Sum Circular Subarray | Medium | |
| 670 | Maximum Swap | Medium | |
| 662 | Maximum Width of Binary Tree | Medium | |
| 253 | Meeting Rooms II | Medium | Amazon, Facebook, Google, Microsoft |
| 56 | Merge Intervals | Medium | Adobe, Amazon, Apple, Facebook, Google, Microsoft |
| 529 | Minesweeper | Medium | |
| 921 | Minimum Add to Make Parentheses Valid | Medium | |
| 939 | Minimum Area Rectangle | Medium | |
| 983 | Minimum Cost For Tickets | Medium | Amazon |
| 1007 | Minimum Domino Rotations For Equal Row | Medium | |
| 931 | Minimum Falling Path Sum | Medium | |
| 433 | Minimum Genetic Mutation | Medium | |
| 310 | Minimum Height Trees | Medium | |
| 452 | Minimum Number of Arrows to Burst Balloons | Medium | |
| 64 | Minimum Path Sum | Medium | Adobe, Amazon, Google, Microsoft |
| 209 | Minimum Size Subarray Sum | Medium | Google, Microsoft |
| 539 | Minimum Time Difference | Medium | |
| 163 | Missing Ranges | Medium | Amazon |
| 508 | Most Frequent Subtree Sum | Medium | Amazon |
| 947 | Most Stones Removed with Same Row or Column | Medium | |
| 43 | Multiply Strings | Medium | Amazon, Apple, Facebook, Google, Microsoft |
| 729 | My Calendar I | Medium | Amazon, Google, Microsoft |
| 731 | My Calendar II | Medium | Amazon, Google |
| 743 | Network Delay Time | Medium | Amazon |
| 681 | Next Closest Time | Medium | Facebook, Google |
| 503 | Next Greater Element II | Medium | Microsoft |
| 556 | Next Greater Element III | Medium | Amazon |
| 1019 | Next Greater Node In Linked List | Medium | Amazon |
| 31 | Next Permutation | Medium | Adobe, Amazon, Apple, Facebook, Google, Microsoft |
| 435 | Non-overlapping Intervals | Medium | Apple, Google |
| 177 | Nth Highest Salary | Medium | Adobe, Amazon, Apple, Facebook |
| 750 | Number Of Corner Rectangles | Medium | |
| 694 | Number of Distinct Islands | Medium | Amazon, Facebook, Google, Microsoft |
| 200 | Number of Islands | Medium | Adobe, Affirm, Alibaba, Amazon, appdynamics, Facebook, Google, Microsoft |
| 673 | Number of Longest Increasing Subsequence | Medium | Amazon, Facebook |
| 792 | Number of Matching Subsequences | Medium | |
| 328 | Odd Even Linked List | Medium | Amazon, Google, Microsoft |
| 161 | One Edit Distance | Medium | Facebook, Microsoft |
| 911 | Online Election | Medium | Apple, Google |
| 752 | Open the Lock | Medium | Facebook, Google |
| 544 | Output Contest Matches | Medium | |
| 417 | Pacific Atlantic Water Flow | Medium | Google, Microsoft |
| 131 | Palindrome Partitioning | Medium | Adobe, Amazon |
| 647 | Palindromic Substrings | Medium | Adobe, Amazon, Facebook, Google, Microsoft |
| 416 | Partition Equal Subset Sum | Medium | Facebook, Google, Microsoft |
| 86 | Partition List | Medium | Amazon, Microsoft |
| 698 | Partition to K Equal Sum Subsets | Medium | |
| 113 | Path Sum II | Medium | Amazon, appdynamics, Facebook, Google |
| 284 | Peeking Iterator | Medium | |
| 279 | Perfect Squares | Medium | Adobe, Amazon, Facebook, Google |
| 567 | Permutation in String | Medium | Facebook, Google |
| 60 | Permutation Sequence | Medium | Amazon, Google |
| 46 | Permutations | Medium | Adobe, Amazon, Apple, Facebook, Google, Microsoft |
| 47 | Permutations II | Medium | Adobe, Amazon, Facebook |
| 369 | Plus One Linked List | Medium | Amazon, Google |
| 117 | Populating Next Right Pointers in Each Node II | Medium | Amazon, Facebook, Google, Microsoft |
| 116 | Populating Next Right Pointers in Each Node | Medium | |
| 886 | Possible Bipartition | Medium | |
| 755 | Pour Water | Medium | Airbnb |
| 50 | Pow(x, n) | Medium | Adobe, Alibaba, Amazon, Apple, Facebook, Microsoft |
| 486 | Predict the Winner | Medium | |
| 655 | Print Binary Tree | Medium | Microsoft |
| 957 | Prison Cells After N Days | Medium | Amazon |
| 238 | Product of Array Except Self | Medium | Adobe, Amazon, Apple, Facebook, Google, Microsoft |
| 756 | Pyramid Transition Matrix | Medium | Airbnb |
| 406 | Queue Reconstruction by Height | Medium | Amazon, Google |
| 398 | Random Pick Index | Medium | Facebook, Google |
| 528 | Random Pick with Weight | Medium | Google, Microsoft |
| 497 | Random Point in Non-overlapping Rectangles | Medium | |
| 370 | Range Addition | Medium | |
| 938 | Range Sum of BST | Medium | |
| 307 | Range Sum Query - Mutable | Medium | Facebook, Google |
| 304 | Range Sum Query 2D - Immutable | Medium | Facebook, Google, Microsoft |
| 178 | Rank Scores | Medium | Amazon, Apple |
| 332 | Reconstruct Itinerary | Medium | Amazon, Facebook, Google, Microsoft |
| 223 | Rectangle Area | Medium | Microsoft |
| 684 | Redundant Connection | Medium | |
| 722 | Remove Comments | Medium | Amazon, Facebook, Google, Microsoft |
| 80 | Remove Duplicates from Sorted Array II | Medium | |
| 82 | Remove Duplicates from Sorted List II | Medium | |
| 402 | Remove K Digits | Medium | Adobe, Amazon, Facebook, Microsoft |
| 19 | Remove Nth Node From End of List | Medium | |
| 143 | Reorder List | Medium | Amazon, Facebook, Google, Microsoft |
| 767 | Reorganize String | Medium | Amazon, Facebook, Google |
| 187 | Repeated DNA Sequences | Medium | |
| 93 | Restore IP Addresses | Medium | Microsoft |
| 92 | Reverse Linked List II | Medium | Adobe, Alibaba, Amazon, Facebook, Google, Microsoft |
| 151 | Reverse Words in a String | Medium | |
| 186 | Reverse Words in a String II | Medium | Amazon, Microsoft |
| 900 | RLE Iterator | Medium | Amazon, Google |
| 61 | Rotate List | Medium | Amazon, Microsoft |
| 74 | Search a 2D Matrix | Medium | Amazon, Facebook, Google, Microsoft |
| 240 | Search a 2D Matrix II | Medium | Amazon, Facebook, Google, Microsoft |
| 702 | Search in a Sorted Array of Unknown Size | Medium | |
| 33 | Search in Rotated Sorted Array | Medium | Alibaba, Amazon, Apple, Facebook, Google, Microsoft |
| 81 | Search in Rotated Sorted Array II | Medium | |
| 418 | Sentence Screen Fitting | Medium | |
| 737 | Sentence Similarity II | Medium | |
| 444 | Sequence Reconstruction | Medium | |
| 449 | Serialize and Deserialize BST | Medium | Amazon, Facebook, Google, Microsoft |
| 73 | Set Matrix Zeroes | Medium | Amazon, Apple, Facebook, Google, Microsoft |
| 384 | Shuffle an Array | Medium | Amazon, Google, Microsoft |
| 71 | Simplify Path | Medium | Adobe, Amazon, Facebook, Microsoft |
| 540 | Single Element in a Sorted Array | Medium | Amazon, Google |
| 137 | Single Number II | Medium | Amazon, Facebook, Google |
| 260 | Single Number III | Medium | Adobe, Facebook |
| 865 | Smallest Subtree with all the Deepest Nodes | Medium | |
| 909 | Snakes and Ladders | Medium | Amazon |
| 640 | Solve the Equation | Medium | Amazon |
| 451 | Sort Characters By Frequency | Medium | Amazon, Google, Microsoft |
| 75 | Sort Colors | Medium | Adobe, Amazon, Apple, Facebook, Google, Microsoft |
| 148 | Sort List | Medium | Amazon, Facebook, Google, Microsoft |
| 360 | Sort Transformed Array | Medium | Facebook, Google |
| 311 | Sparse Matrix Multiplication | Medium | Apple |
| 54 | Spiral Matrix | Medium | Adobe, Amazon, Apple, Facebook, Google, Microsoft |
| 59 | Spiral Matrix II | Medium | Amazon, Google, Microsoft |
| 885 | Spiral Matrix III | Medium | |
| 659 | Split Array into Consecutive Subsequences | Medium | |
| 548 | Split Array with Equal Sum | Medium | |
| 776 | Split BST | Medium | |
| 725 | Split Linked List in Parts | Medium | |
| 877 | Stone Game | Medium | |
| 8 | String to Integer (atoi) | Medium | Apple |
| 247 | Strobogrammatic Number II | Medium | |
| 713 | Subarray Product Less Than K | Medium | Akuna Capital |
| 560 | Subarray Sum Equals K | Medium | Facebook, Microsoft |
| 78 | Subsets | Medium | Adobe, Amazon, Apple, Facebook, Google, Microsoft |
| 90 | Subsets II | Medium | Amazon |
| 228 | Summary Ranges | Medium | Amazon, Google, Microsoft |
| 130 | Surrounded Regions | Medium | Amazon, Google |
| 777 | Swap Adjacent in LR String | Medium | |
| 24 | Swap Nodes in Pairs | Medium | Adobe, Amazon, Google |
| 494 | Target Sum | Medium | Facebook, Google |
| 621 | Task Scheduler | Medium | Amazon, Apple, Facebook, Google, Microsoft |
| 490 | The Maze | Medium | Microsoft |
| 505 | The Maze II | Medium | Amazon, Google |
| 981 | Time Based Key-Value Store | Medium | |
| 347 | Top K Frequent Elements | Medium | Facebook, Google, Microsoft |
| 692 | Top K Frequent Words | Medium | Amazon, Apple, Facebook, Google, Microsoft |
| 477 | Total Hamming Distance | Medium | |
| 120 | Triangle | Medium | Amazon, Microsoft |
| 264 | Ugly Number II | Medium | |
| 96 | Unique Binary Search Trees | Medium | Amazon, Google |
| 95 | Unique Binary Search Trees II | Medium | Adobe, Amazon, Google |
| 62 | Unique Paths | Medium | Alibaba, Amazon, Apple, Facebook, Google, Microsoft |
| 63 | Unique Paths II | Medium | Amazon, Facebook, Microsoft |
| 288 | Unique Word Abbreviation | Medium | |
| 393 | UTF-8 Validation | Medium | Facebook, Google |
| 678 | Valid Parenthesis String | Medium | |
| 36 | Valid Sudoku | Medium | Amazon, Apple, Facebook, Google, Microsoft |
| 794 | Valid Tic-Tac-Toe State | Medium | Microsoft |
| 611 | Valid Triangle Number | Medium | Amazon |
| 98 | Validate Binary Search Tree | Medium | Adobe, Amazon, Apple, Facebook, Microsoft |
| 468 | Validate IP Address | Medium | Facebook, Google |
| 987 | Vertical Order Traversal of a Binary Tree | Medium | Adobe, Facebook |
| 286 | Walls and Gates | Medium | Amazon |
| 365 | Water and Jug Problem | Medium | |
| 280 | Wiggle Sort | Medium | |
| 324 | Wiggle Sort II | Medium | Facebook, Airbnb, Akuna Capital |
| 139 | Word Break | Medium | Adobe, Amazon, Apple, Facebook, Google, Microsoft |
| 192 | Word Frequency | Medium | Adobe, Amazon, Facebook |
| 127 | Word Ladder | Medium | Affirm, Airbnb, Amazon, Apple, Facebook, Google, Microsoft |
| 79 | Word Search | Medium | Amazon, Apple, Facebook, Microsoft |
| 6 | ZigZag Conversion | Medium | Adobe, Amazon, Apple, Facebook, Google |
| 281 | Zigzag Iterator | Medium | |
| 48 | Rotate Image | Medium | |
| 679 | 24 Game | Hard | Google, Microsoft |
| 269 | Alien Dictionary | Hard | Amazon, Google |
| 432 | All Oone Data Structure | Hard | Amazon, Facebook |
| 446 | Arithmetic Slices II - Subsequence | Hard | Alibaba, Facebook |
| 224 | Basic Calculator | Hard | Adobe, Amazon, Facebook, Google, Microsoft |
| 772 | Basic Calculator III | Hard | Amazon, Facebook, Google, Microsoft |
| 770 | Basic Calculator IV | Hard | |
| 296 | Best Meeting Point | Hard | Google, Facebook |
| 123 | Best Time to Buy and Sell Stock III | Hard | Amazon, Microsoft |
| 188 | Best Time to Buy and Sell Stock IV | Hard | Amazon, Google |
| 968 | Binary Tree Cameras | Hard | |
| 124 | Binary Tree Maximum Path Sum | Hard | Apple |
| 145 | Binary Tree Postorder Traversal | Hard | Amazon |
| 803 | Bricks Falling When Hit | Hard | |
| 312 | Burst Balloons | Hard | Amazon, Google |
| 815 | Bus Routes | Hard | Airbnb, Amazon, Google |
| 135 | Candy | Hard | |
| 913 | Cat and Mouse | Hard | |
| 272 | Closest Binary Search Tree Value II | Hard | Amazon |
| 472 | Concatenated Words | Hard | Amazon |
| 829 | Consecutive Numbers Sum | Hard | Adobe, Airbnb |
| 730 | Count Different Palindromic Subsequences | Hard | |
| 315 | Count of Smaller Numbers After Self | Hard | Adobe, Apple |
| 630 | Course Schedule III | Hard | |
| 753 | Cracking the Safe | Hard | Amazon, Google |
| 675 | Cut Off Trees for Golf Event | Hard | Amazon |
| 639 | Decode Ways II | Hard | |
| 185 | Department Top Three Salaries | Hard | Adobe, Amazon, Google |
| 631 | Design Excel Sum Formula | Hard | Amazon |
| 588 | Design In-Memory File System | Hard | Amazon |
| 642 | Design Search Autocomplete System | Hard | |
| 115 | Distinct Subsequences | Hard | |
| 940 | Distinct Subsequences II | Hard | |
| 174 | Dungeon Game | Hard | Amazon |
| 72 | Edit Distance | Hard | Facebook, Adobe, Amazon, Apple, Google, Microsoft |
| 759 | Employee Free Time | Hard | Airbnb, Amazon, Google, Microsoft |
| 471 | Encode String with Shortest Length | Hard | |
| 282 | Expression Add Operators | Hard | Google, Apple, Facebook |
| 336 | Facebook - LeetCodePalindrome Pairs 30.7% | Hard | |
| 579 | Find Cumulative Salary of an Employee | Hard | Amazon |
| 295 | Find Median from Data Stream | Hard | Akuna Capital, Amazon, Apple, Facebook, Google, Microsoft |
| 154 | Find Minimum in Rotated Sorted Array II | Hard | Facebook, Google |
| 564 | Find the Closest Palindrome | Hard | Amazon, Facebook, Microsoft |
| 943 | Find the Shortest Superstring | Hard | |
| 41 | First Missing Positive | Hard | Amazon |
| 403 | Frog Jump | Hard | Amazon, Apple, Facebook, Google |
| 843 | Guess the Word | Hard | Airbnb, Amazon, Facebook, Google |
| 381 | Insert Delete GetRandom O(1) - Duplicates allowed | Hard | Affirm, Amazon |
| 57 | Insert Interval | Hard | Amazon, Apple, Facebook, Google, Microsoft |
| 273 | Integer to English Words | Hard | Amazon |
| 97 | Interleaving String | Hard | Amazon, Apple, Microsoft |
| 45 | Jump Game II | Hard | Adobe, Amazon, Apple, Google |
| 683 | K Empty Slots | Hard | Google, Microsoft |
| 854 | K-Similar Strings | Hard | |
| 668 | Kth Smallest Number in Multiplication Table | Hard | |
| 479 | Largest Palindrome Product | Hard | Apple |
| 84 | Largest Rectangle in Histogram | Hard | Microsoft |
| 460 | LFU Cache | Hard | Amazon |
| 128 | Longest Consecutive Sequence | Hard | Alibaba, Google |
| 329 | Longest Increasing Path in a Matrix | Hard | |
| 340 | Longest Substring with At Most K Distinct Characters | Hard | Facebook, Google |
| 159 | Longest Substring with At Most Two Distinct | Hard | |
| 32 | Longest Valid Parentheses | Hard | Amazon |
| 146 | LRU Cache | Hard | Alibaba |
| 827 | Making A Large Island | Hard | |
| 768 | Max Chunks To Make Sorted II | Hard | |
| 149 | Max Points on a Line | Hard | Adobe, Amazon, Google, Microsoft |
| 363 | Max Sum of Rectangle No Larger Than K | Hard | |
| 85 | Maximal Rectangle | Hard | Adobe, Amazon, Google, Microsoft |
| 895 | Maximum Frequency Stack | Hard | Amazon |
| 164 | Maximum Gap | Hard | Amazon |
| 689 | Maximum Sum of 3 Non-Overlapping Subarrays | Hard | Facebook, Google |
| 568 | Maximum Vacation Days | Hard | Facebook, Google, Microsoft |
| 4 | Median of Two Sorted Arrays | Hard | Alibaba, Apple |
| 23 | Merge k Sorted Lists | Hard | Adobe, Alibaba, Amazon, Apple, Facebook, Google, Microsoft |
| 924 | Minimize Malware Spread | Hard | Amazon |
| 774 | Minimize Max Distance to Gas Station | Hard | |
| 857 | Minimum Cost to Hire K Workers | Hard | |
| 995 | Minimum Number of K Consecutive Bit Flips | Hard | Akuna Capital |
| 871 | Minimum Number of Refueling Stops | Hard | Amazon |
| 727 | Minimum Window Subsequence | Hard | |
| 76 | Minimum Window Substring | Hard | Airbnb |
| 51 | N-Queens | Hard | Alibaba, Amazon, Facebook, Microsoft |
| 726 | Number of Atoms | Hard | Adobe |
| 233 | Number of Digit One | Hard | Amazon |
| 711 | Number of Distinct Islands II | Hard | Amazon |
| 305 | Number of Islands II | Hard | Amazon, Google |
| 920 | Number of Music Playlists | Hard | |
| 975 | Odd Even Jump | Hard | |
| 465 | Optimal Account Balancing | Hard | |
| 132 | Palindrome Partitioning II | Hard | |
| 736 | Parse Lisp Expression | Hard | Affirm |
| 745 | Prefix and Suffix Search | Hard | |
| 793 | Preimage Size of Factorial Zeroes Function | Hard | Amazon |
| 818 | Race Car | Hard | |
| 710 | Random Pick with Blacklist | Hard | Amazon, Google |
| 715 | Range Module | Hard | |
| 308 | Range Sum Query 2D - Mutable | Hard | Facebook, Google |
| 158 | Read N Characters Given Read4 II - Call multiple | Hard | |
| 99 | Recover Binary Search Tree | Hard | Facebook, Google |
| 850 | Rectangle Area II | Hard | |
| 685 | Redundant Connection II | Hard | |
| 10 | Regular Expression Matching | Hard | Alibaba, Amazon, Google |
| 316 | Remove Duplicate Letters | Hard | Microsoft |
| 301 | Remove Invalid Parentheses | Hard | Amazon, Google |
| 25 | Reverse Nodes in k-Group | Hard | Amazon |
| 493 | Reverse Pairs | Hard | Apple, Facebook, Google, Microsoft |
| 489 | Robot Room Cleaner | Hard | Amazon, Google |
| 354 | Russian Doll Envelopes | Hard | |
| 87 | Scramble String | Hard | |
| 297 | Serialize and Deserialize Binary Tree | Hard | Amazon, Facebook, Google, Microsoft |
| 428 | Serialize and Deserialize N-ary Tree | Hard | |
| 317 | Shortest Distance from All Buildings | Hard | Amazon |
| 847 | Shortest Path Visiting All Nodes | Hard | Amazon |
| 862 | Shortest Subarray with Sum at Least K | Hard | |
| 773 | Sliding Puzzle | Hard | Airbnb, Amazon, Google |
| 239 | Sliding Window Maximum | Hard | Apple, Microsoft |
| 480 | Sliding Window Median | Hard | Amazon, Google |
| 632 | Smallest Range | Hard | Facebook, Microsoft |
| 302 | Smallest Rectangle Enclosing Black Pixels | Hard | |
| 761 | Special Binary String | Hard | |
| 410 | Split Array Largest Sum | Hard | |
| 805 | Split Array With Same Average | Hard | |
| 936 | Stamping The Sequence | Hard | |
| 248 | Strobogrammatic Number III | Hard | |
| 552 | Student Attendance Record II | Hard | |
| 992 | Subarrays with K Different Integers | Hard | Amazon |
| 30 | Substring with Concatenation of All Words | Hard | Adobe, Apple, Facebook, Google |
| 37 | Sudoku Solver | Hard | Amazon |
| 834 | Sum of Distances in Tree | Hard | |
| 778 | Swim in Rising Water | Hard | Amazon |
| 591 | Tag Validator | Hard | |
| 68 | Text Justification | Hard | Airbnb, Amazon, Facebook, Google, Microsoft |
| 42 | Trapping Rain Water | Hard | Adobe, , Amazon, Apple, Facebook, Google, Microsoft |
| 407 | Trapping Rain Water II | Hard | Apple, Google, Microsoft |
| 262 | Trips and Users | Hard | Adobe |
| 980 | Unique Paths III | Hard | Amazon |
| 65 | Valid Number | Hard | Apple, Facebook, Google, Microsoft |
| 44 | Wildcard Matching | Hard | Adobe, Amazon, Facebook, Google, Microsoft |
| 527 | Word Abbreviation | Hard | |
| 140 | Word Break II | Hard | Amazon, Apple, Facebook |
| 126 | Word Ladder II | Hard | Facebook, Google, Microsoft |
| 291 | Word Pattern II | Hard | |
| 212 | Word Search II | Hard | Airbnb, Amazon, Apple, Facebook, Microsoft |
| 425 | Word Squares | Hard | |
| 218 | The Skyline Problem | Hard |