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Leetcode Questions By Companies

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 Google
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 Google
110 Balanced Binary Tree Easy Amazon, Google
682 Baseball Game Easy Amazon
121 Best Time to Buy and Sell Stock Easy Facebook
122 Best Time to Buy and Sell Stock II Easy Alibaba
595 Big Countries Easy Adobe, Amazon, Google
704 Binary Search Easy Google
107 Binary Tree Level Order Traversal II Easy Microsoft
257 Binary Tree Paths Easy Amazon, Facebook, Microsoft
859 Buddy Strings Easy Google
70 Climbing Stairs Easy Adobe, Alibaba, Amazon, Apple, Facebook, Microsoft
270 Closest Binary Search Tree Value Easy Google
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 Facebook
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 Google
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 Google
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 Google
733 Flood Fill Easy Amazon, Google
597 Friend Requests I: Overall Acceptance Rate Easy Facebook
824 Goat Latin Easy Facebook
374 Google - LeetCodeGuess Number Higher or Lower Easy Google
933 Google - LeetCodeNumber of Recent Calls Easy Google
572 Google - LeetCodeSubtree of Another Tree Easy Google
202 Happy Number Easy Amazon, Apple, Facebook
475 Heaters Easy Google
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 Facebook
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 Google
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 Google
169 Majority Element Easy Adobe, Amazon, Apple, Google, Microsoft
485 Max Consecutive Ones Easy Amazon
716 Max Stack Easy Facebook
849 Maximize Distance to Closest Person Easy Google
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 Facebook
819 Most Common Word Easy Amazon, Google, Microsoft
283 Move Zeroes Easy Adobe, Apple, Facebook, Google, Microsoft
346 Moving Average from Data Stream Easy Google
429 N-ary Tree Level Order Traversal Easy Google
339 Nested List Weight Sum Easy Amazon
496 Next Greater Element I Easy Amazon, Google
665 Non-decreasing Array Easy Google
400 Nth Digit Easy Adobe, Google
476 Number Complement Easy Google
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 Google
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 Google
100 Same Tree Easy Amazon, Apple, Facebook, Google
700 Search in a Binary Search Tree Easy Google
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 Google
821 Shortest Distance to a Character Easy Google
243 Shortest Word Distance Easy Amazon, Google
800 Similar RGB Color Easy Google
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 Google
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 Facebook
653 Two Sum IV - Input is a BST Easy Google
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 Google
125 Valid Palindrome Easy Amazon, Apple, Facebook, Google, Microsoft
680 Valid Palindrome II Easy Facebook
20 Valid Parentheses Easy Adobe, Akuna Capital, Amazon, Apple, Facebook, Google, Microsoft
193 Valid Phone Numbers Easy Adobe
953 Verifying an Alien Dictionary Easy Facebook
290 Word Pattern Easy Google, Microsoft
914 X of a Kind in a Deck of Cards Easy Google
542 01 Matrix Medium Google
15 3Sum Medium Adobe, Akuna Capital, Amazon, Apple, Google, Microsoft, Alibaba
16 3Sum Closest Medium Amazon, Apple, Google, Microsoft
259 3Sum Smaller Medium Google
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 Facebook
616 Add Bold Tag in String Medium Google
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 Google
351 Android Unlock Patterns Medium Google
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 Facebook
173 Binary Search Tree Iterator Medium Google
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 Facebook
549 Binary Tree Longest Consecutive Sequence II Medium Google
144 Binary Tree Preorder Traversal Medium Google
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 Google
361 Bomb Enemy Medium Amazon, Google
545 Boundary of Binary Tree Medium Amazon
554 Brick Wall Medium Facebook
319 Bulb Switcher Medium Facebook
299 Bulls and Cows Medium Amazon, Google
464 Can I Win Medium Google
723 Candy Crush Medium Google
1011 Capacity To Ship Packages Within D Days Medium Google
853 Car Fleet Medium Google
799 Champagne Tower Medium Google
787 Cheapest Flights Within K Stops Medium Airbnb, Microsoft
958 Check Completeness of a Binary Tree Medium Facebook, Microsoft
457 Circular Array Loop Medium Google
133 Clone Graph Medium Amazon, Facebook
742 Closest Leaf in a Binary Tree Medium Google
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 Facebook
77 Combinations Medium Facebook, Google, Microsoft
165 Compare Version Numbers Medium Amazon, Apple, Microsoft
180 Consecutive Numbers Medium Facebook
1008 Construct Binary Search Tree from Preorder Medium Facebook
106 Construct Binary Tree from Inorder and Postorder Medium Microsoft
105 Construct Binary Tree from Preorder and Inorder Medium Facebook
889 Construct Binary Tree from Preorder and PostorderTraversal Medium Facebook, Google
536 Construct Binary Tree from String Medium Facebook
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 Google
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 Google
379 Design Phone Directory Medium Google
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 Google
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 Google
535 Encode and Decode TinyURL Medium Adobe
663 Equal Tree Partition Medium Facebook
399 Evaluate Division Medium Adobe, Amazon, Facebook, Google
150 Evaluate Reverse Polish Notation Medium Microsoft
855 Exam Room Medium Google
626 Exchange Seats Medium Amazon
636 Exclusive Time of Functions Medium Microsoft
809 Expressive Words Medium Google
442 Find All Duplicates in an Array Medium Amazon, Microsoft
833 Find And Replace in String Medium Google
890 Find and Replace Pattern Medium Apple
609 Find Duplicate File in System Medium Amazon
652 Find Duplicate Subtrees Medium Google
34 Find First and Last Position of Element in Sorted Medium Facebook
658 Find K Closest Elements Medium Facebook
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 Google
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 Google
294 Flip Game II Medium Google
926 Flip String to Monotone Increasing Medium Google
166 Fraction to Recurring Decimal Medium Facebook
547 Friend Circles Medium Amazon, Facebook, Microsoft
825 Friends Of Appropriate Ages Medium Facebook
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 Google
22 Generate Parentheses Medium Adobe, Aetion
478 Generate Random Point in a Circle Medium Facebook
129 Google - LeetCodeSum Root to Leaf Numbers Medium Google
261 Graph Valid Tree Medium Amazon, Google
89 Gray Code Medium Google
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 Google
274 H-Index Medium Google
846 Hand of Straights Medium Google
337 House Robber III Medium Amazon, Facebook, Google
835 Image Overlap Medium Google
676 Implement Magic Dictionary Medium Google
470 Implement Rand10 Using Rand7 Medium Google
208 Implement Trie (Prefix Tree) Medium Amazon
491 Increasing Subsequences Medium Facebook
334 Increasing Triplet Subsequence Medium Amazon, Google, Facebook
285 Inorder Successor in BST Medium Facebook, Microsoft
510 Inorder Successor in BST II Medium Google
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 Google
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 Facebook
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 Google
817 Linked List Components Medium Google
142 Linked List Cycle II Medium Apple, Google, Microsoft
382 Linked List Random Node Medium Apple, Facebook
388 Longest Absolute File Path Medium Google
300 Longest Increasing Subsequence Medium Adobe, Airbnb, Amazon, Apple, Facebook, Google, Microsoft
562 Longest Line of Consecutive One in Matrix Medium Google
845 Longest Mountain in Array Medium Google
516 Longest Palindromic Subsequence Medium Apple, Microsoft
5 Longest Palindromic Substring Medium Alibaba
424 Longest Repeating Character Replacement Medium Google
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 Google
236 Lowest Common Ancestor of a Binary Tree Medium Google
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 Google
487 Max Consecutive Ones II Medium Google
1004 Max Consecutive Ones III Medium Facebook
807 Max Increase to Keep City Skyline Medium Google
221 Maximal Square Medium Google
654 Maximum Binary Tree Medium Amazon
318 Maximum Product of Word Lengths Medium Google
152 Maximum Product Subarray Medium Adobe
325 Maximum Size Subarray Sum Equals k Medium Facebook
918 Maximum Sum Circular Subarray Medium Facebook
670 Maximum Swap Medium Facebook
662 Maximum Width of Binary Tree Medium Google
253 Meeting Rooms II Medium Amazon, Facebook, Google, Microsoft
56 Merge Intervals Medium Adobe, Amazon, Apple, Facebook, Google, Microsoft
529 Minesweeper Medium Google
921 Minimum Add to Make Parentheses Valid Medium Facebook
939 Minimum Area Rectangle Medium Google
983 Minimum Cost For Tickets Medium Amazon
1007 Minimum Domino Rotations For Equal Row Medium Google
931 Minimum Falling Path Sum Medium Google
433 Minimum Genetic Mutation Medium Google
310 Minimum Height Trees Medium Google
452 Minimum Number of Arrows to Burst Balloons Medium Facebook
64 Minimum Path Sum Medium Adobe, Amazon, Google, Microsoft
209 Minimum Size Subarray Sum Medium Google, Microsoft
539 Minimum Time Difference Medium Google
163 Missing Ranges Medium Amazon
508 Most Frequent Subtree Sum Medium Amazon
947 Most Stones Removed with Same Row or Column Medium Google
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 Google
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 Google
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 Google
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 Google
113 Path Sum II Medium Amazon, appdynamics, Facebook, Google
284 Peeking Iterator Medium Google
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 Facebook
886 Possible Bipartition Medium Facebook
755 Pour Water Medium Airbnb
50 Pow(x, n) Medium Adobe, Alibaba, Amazon, Apple, Facebook, Microsoft
486 Predict the Winner Medium Google
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 Google
370 Range Addition Medium Google
938 Range Sum of BST Medium Google
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 Google
722 Remove Comments Medium Amazon, Facebook, Google, Microsoft
80 Remove Duplicates from Sorted Array II Medium Google
82 Remove Duplicates from Sorted List II Medium Google
402 Remove K Digits Medium Adobe, Amazon, Facebook, Microsoft
19 Remove Nth Node From End of List Medium Facebook
143 Reorder List Medium Amazon, Facebook, Google, Microsoft
767 Reorganize String Medium Amazon, Facebook, Google
187 Repeated DNA Sequences Medium Google
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 Facebook
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 Google
33 Search in Rotated Sorted Array Medium Alibaba, Amazon, Apple, Facebook, Google, Microsoft
81 Search in Rotated Sorted Array II Medium Google
418 Sentence Screen Fitting Medium Google
737 Sentence Similarity II Medium Google
444 Sequence Reconstruction Medium Google
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 Facebook
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 Facebook
659 Split Array into Consecutive Subsequences Medium Google
548 Split Array with Equal Sum Medium Facebook
776 Split BST Medium Google
725 Split Linked List in Parts Medium Google
877 Stone Game Medium Google
8 String to Integer (atoi) Medium Apple
247 Strobogrammatic Number II Medium Google
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 Google
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 Facebook
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 Facebook
120 Triangle Medium Amazon, Microsoft
264 Ugly Number II Medium Google
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 Google
393 UTF-8 Validation Medium Facebook, Google
678 Valid Parenthesis String Medium Facebook
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 Google
280 Wiggle Sort Medium Google
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 Google
48 Rotate Image Medium Facebook
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 Google
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 Google
124 Binary Tree Maximum Path Sum Hard Apple
145 Binary Tree Postorder Traversal Hard Amazon
803 Bricks Falling When Hit Hard Google
312 Burst Balloons Hard Amazon, Google
815 Bus Routes Hard Airbnb, Amazon, Google
135 Candy Hard Google
913 Cat and Mouse Hard Google
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 Google
315 Count of Smaller Numbers After Self Hard Adobe, Apple
630 Course Schedule III Hard Google
753 Cracking the Safe Hard Amazon, Google
675 Cut Off Trees for Golf Event Hard Amazon
639 Decode Ways II Hard Facebook
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 Google
115 Distinct Subsequences Hard Google
940 Distinct Subsequences II Hard Google
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 Google
282 Expression Add Operators Hard Google, Apple, Facebook
336 Facebook - LeetCodePalindrome Pairs 30.7% Hard Facebook
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 Google
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 Google
668 Kth Smallest Number in Multiplication Table Hard Google
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 Facebook
340 Longest Substring with At Most K Distinct Characters Hard Facebook, Google
159 Longest Substring with At Most Two Distinct Hard Facebook
32 Longest Valid Parentheses Hard Amazon
146 LRU Cache Hard Alibaba
827 Making A Large Island Hard Google
768 Max Chunks To Make Sorted II Hard Google
149 Max Points on a Line Hard Adobe, Amazon, Google, Microsoft
363 Max Sum of Rectangle No Larger Than K Hard Google
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 Google
857 Minimum Cost to Hire K Workers Hard Google
995 Minimum Number of K Consecutive Bit Flips Hard Akuna Capital
871 Minimum Number of Refueling Stops Hard Amazon
727 Minimum Window Subsequence Hard Google
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 Google
975 Odd Even Jump Hard Google
465 Optimal Account Balancing Hard Google
132 Palindrome Partitioning II Hard Google
736 Parse Lisp Expression Hard Affirm
745 Prefix and Suffix Search Hard Google
793 Preimage Size of Factorial Zeroes Function Hard Amazon
818 Race Car Hard Google
710 Random Pick with Blacklist Hard Amazon, Google
715 Range Module Hard Google
308 Range Sum Query 2D - Mutable Hard Facebook, Google
158 Read N Characters Given Read4 II - Call multiple Hard Facebook
99 Recover Binary Search Tree Hard Facebook, Google
850 Rectangle Area II Hard Google
685 Redundant Connection II Hard Google
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 Google
87 Scramble String Hard Google
297 Serialize and Deserialize Binary Tree Hard Amazon, Facebook, Google, Microsoft
428 Serialize and Deserialize N-ary Tree Hard Facebook
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 Facebook
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 Google
761 Special Binary String Hard Google
410 Split Array Largest Sum Hard Google
805 Split Array With Same Average Hard Google
936 Stamping The Sequence Hard Google
248 Strobogrammatic Number III Hard Facebook
552 Student Attendance Record II Hard Google
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 Google
778 Swim in Rising Water Hard Amazon
591 Tag Validator Hard Google
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 Google
140 Word Break II Hard Amazon, Apple, Facebook
126 Word Ladder II Hard Facebook, Google, Microsoft
291 Word Pattern II Hard Facebook
212 Word Search II Hard Airbnb, Amazon, Apple, Facebook, Microsoft
425 Word Squares Hard Google
218 The Skyline Problem Hard Facebook

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