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Problems

797 problems

Has videoPremium onlyReset
Array2,237String877Hash Table797Math691Dynamic Programming673Sorting508Greedy485Binary Search357Depth-First Search338Database308Bit Manipulation286Matrix279Tree264Breadth-First Search257Prefix Sum252All topics

797 results

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TitleSolutionAcceptDifficultyTopics
311. Sparse Matrix MultiplicationVideoPremium
Solution69.3%Medium
Array, Hash Table +1· 9 companies
314. Binary Tree Vertical Order TraversalVideoPremium
Solution57.8%Medium
Binary Tree, Breadth-First Search +4· 9 companies
325. Maximum Size Subarray Sum Equals kVideoPremium
Solution50.8%Medium
Array, Hash Table +1· 8 companies
336. Palindrome PairsVideo
Solution37.7%Hard
Array, Hash Table +2· 8 companies
340. Longest Substring with At Most K Distinct CharactersVideoPremium
Solution49.9%Medium
Hash Table, Sliding Window +1· 12 companies
347. Top K Frequent ElementsVideo
Solution67.3%Medium
Array, Bucket Sort +6· 53 companies
348. Design Tic-Tac-ToeVideoPremium
Solution58.8%Medium
Array, Design +3· 13 companies
349. Intersection of Two ArraysVideo
Solution78.2%Easy
Array, Binary Search +3· 16 companies
350. Intersection of Two Arrays IIVideo
Solution60.4%Easy
Array, Binary Search +3· 9 companies
353. Design Snake GameVideoPremium
Solution40.0%Medium
Array, Design +3· 10 companies
355. Design TwitterVideo
Solution45.6%Medium
Design, Hash Table +2· 14 companies
356. Line ReflectionVideoPremium
Solution36.3%Medium
Array, Hash Table +1· 2 companies
358. Rearrange String k Distance ApartVideoPremium
Solution39.9%Hard
Counting, Greedy +4· 4 companies
359. Logger Rate LimiterVideoPremium
Solution76.8%Easy
Data Stream, Design +1· 21 companies
379. Design Phone DirectoryVideoPremium
Solution53.3%Medium
Array, Design +3· 1 company
380. Insert Delete GetRandom O(1)Video
Solution55.3%Medium
Array, Design +3· 38 companies
381. Insert Delete GetRandom O(1) - Duplicates allowedVideo
Solution37.1%Hard
Array, Design +3· 11 companies
383. Ransom NoteVideo
Solution66.3%Easy
Counting, Hash Table +1· 14 companies
387. First Unique Character in a StringVideo
Solution66.4%Easy
Counting, Hash Table +2· 25 companies
389. Find the DifferenceVideo
Solution60.8%Easy
Bit Manipulation, Hash Table +2· 6 companies
395. Longest Substring with At Least K Repeating CharactersVideo
Solution46.8%Medium
Divide and Conquer, Hash Table +2· 10 companies
398. Random Pick IndexVideo
Solution65.0%Medium
Hash Table, Math +2· 4 companies
409. Longest PalindromeVideo
Solution55.9%Easy
Greedy, Hash Table +1· 8 companies
421. Maximum XOR of Two Numbers in an ArrayVideo
Solution53.8%Medium
Array, Bit Manipulation +2· 5 companies
423. Reconstruct Original Digits from EnglishVideo
Solution53.4%Medium
Hash Table, Math +1· 4 companies
424. Longest Repeating Character ReplacementVideo
Solution60.4%Medium
Hash Table, Sliding Window +1· 22 companies
432. All O`one Data StructureVideo
Solution44.2%Hard
Design, Doubly-Linked List +2· 13 companies
433. Minimum Genetic MutationVideo
Solution57.1%Medium
Breadth-First Search, Hash Table +1· 6 companies
438. Find All Anagrams in a StringVideo
Solution54.7%Medium
Hash Table, Sliding Window +1· 15 companies
442. Find All Duplicates in an ArrayVideo
Solution76.8%Medium
Array, Hash Table· 11 companies
447. Number of BoomerangsVideo
Solution58.0%Medium
Array, Hash Table +1· 2 companies
448. Find All Numbers Disappeared in an ArrayVideo
Solution64.4%Easy
Array, Hash Table· 7 companies
451. Sort Characters By FrequencyVideo
Solution75.8%Medium
Bucket Sort, Counting +4· 16 companies
454. 4Sum IIVideo
Solution57.9%Medium
Array, Hash Table· 4 companies
457. Circular Array LoopVideo
Solution38.3%Medium
Array, Hash Table +1· 4 companies
460. LFU CacheVideo
Solution50.0%Hard
Design, Doubly-Linked List +2· 32 companies
480. Sliding Window MedianVideo
Solution38.7%Hard
Array, Hash Table +2· 11 companies
491. Non-decreasing SubsequencesVideo
Solution63.1%Medium
Array, Backtracking +2· 3 companies
496. Next Greater Element IVideo
Solution76.5%Easy
Array, Hash Table +2· 17 companies
500. Keyboard RowVideo
Solution74.3%Easy
Array, Hash Table +1· 4 companies
508. Most Frequent Subtree SumVideo
Solution69.6%Medium
Binary Tree, Depth-First Search +2· 3 companies
519. Random Flip MatrixVideo
Solution46.9%Medium
Hash Table, Math +2· 1 company
522. Longest Uncommon Subsequence IIVideo
Solution45.8%Medium
Array, Hash Table +3· 1 company
523. Continuous Subarray SumVideo
Solution31.3%Medium
Array, Hash Table +2· 9 companies
525. Contiguous ArrayVideo
Solution52.2%Medium
Array, Hash Table +1· 16 companies
531. Lonely Pixel IVideoPremium
Solution62.3%Medium
Array, Hash Table +1· 1 company
532. K-diff Pairs in an ArrayVideo
Solution46.3%Medium
Array, Binary Search +3· 8 companies
533. Lonely Pixel IIVideoPremium
Solution48.7%Medium
Array, Hash Table +1· 1 company
535. Encode and Decode TinyURLVideo
Solution86.5%Medium
Design, Hash Function +2· 9 companies
548. Split Array with Equal SumVideoPremium
Solution50.1%Hard
Array, Hash Table +1· 1 company
Showing 51–100 of 797