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105 problems

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Array274 Database207 String109 Hash Table105 Depth-First Search75 Math70 Dynamic Programming69 Sorting61 Tree60 Breadth-First Search51 Binary Tree47 Greedy47 Binary Search46 Matrix38 Two Pointers37 All topics

With video · Premium · 105 results

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TitleSolutionAcceptDifficultyTopics

159. Longest Substring with At Most Two Distinct CharactersVideoPremium

Solution57.0%Medium

Hash Table, Sliding Window +1· 5 companies

170. Two Sum III - Data structure designVideoPremium

Solution39.1%Easy

Array, Data Stream +3· 2 companies

244. Shortest Word Distance IIVideoPremium

Solution62.8%Medium

Array, Design +3· 4 companies

246. Strobogrammatic NumberVideoPremium

Solution47.6%Easy

Hash Table, String +1· 2 companies

249. Group Shifted StringsVideoPremium

Solution67.8%Medium

Array, Hash Table +1· 4 companies

266. Palindrome PermutationVideoPremium

Solution68.6%Easy

Bit Manipulation, Hash Table +1· 5 companies

267. Palindrome Permutation IIVideoPremium

Solution41.9%Medium

Backtracking, Hash Table +1

288. Unique Word AbbreviationVideoPremium

Solution28.1%Medium

Array, Design +2· 1 company

291. Word Pattern IIVideoPremium

Solution49.1%Medium

Backtracking, Hash Table +1· 6 companies

305. Number of Islands IIVideoPremium

Solution40.5%Hard

Array, Hash Table +1· 10 companies

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

340. Longest Substring with At Most K Distinct CharactersVideoPremium

Solution49.9%Medium

Hash Table, Sliding Window +1· 12 companies

348. Design Tic-Tac-ToeVideoPremium

Solution58.8%Medium

Array, Design +3· 13 companies

353. Design Snake GameVideoPremium

Solution40.0%Medium

Array, Design +3· 10 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

531. Lonely Pixel IVideoPremium

Solution62.3%Medium

Array, Hash Table +1· 1 company

533. Lonely Pixel IIVideoPremium

Solution48.7%Medium

Array, Hash Table +1· 1 company

548. Split Array with Equal SumVideoPremium

Solution50.1%Hard

Array, Hash Table +1· 1 company

582. Kill ProcessVideoPremium

Solution70.4%Medium

Array, Breadth-First Search +3· 4 companies

588. Design In-Memory File SystemVideoPremium

Solution48.0%Hard

Design, Hash Table +3· 16 companies

616. Add Bold Tag in StringVideoPremium

Solution51.4%Medium

Array, Hash Table +3· 4 companies

635. Design Log Storage SystemVideoPremium

Solution59.8%Medium

Design, Hash Table +2· 4 companies

666. Path Sum IVVideoPremium

Solution62.5%Medium

Array, Binary Tree +3· 1 company

681. Next Closest TimeVideoPremium

Solution46.8%Medium

Backtracking, Enumeration +2· 1 company

694. Number of Distinct IslandsVideoPremium

Solution62.8%Medium

Breadth-First Search, Depth-First Search +3· 12 companies

711. Number of Distinct Islands IIVideoPremium

Solution55.3%Hard

Breadth-First Search, Depth-First Search +3· 2 companies

734. Sentence SimilarityVideoPremium

Solution44.5%Easy

Array, Hash Table +1· 1 company

737. Sentence Similarity IIVideoPremium

Solution51.2%Medium

Array, Breadth-First Search +4· 4 companies

758. Bold Words in StringVideoPremium

Solution53.2%Medium

Array, Hash Table +3· 1 company

760. Find Anagram MappingsVideoPremium

Solution83.8%Easy

Array, Hash Table· 1 company

1086. High FiveVideoPremium

Solution74.5%Easy

Array, Hash Table +2· 2 companies

1100. Find K-Length Substrings With No Repeated CharactersVideoPremium

Solution76.5%Medium

Hash Table, Sliding Window +1· 1 company

1133. Largest Unique NumberVideoPremium

Solution71.3%Easy

Array, Hash Table +1· 1 company

1152. Analyze User Website Visit PatternVideoPremium

Solution44.3%Medium

Array, Hash Table +1· 5 companies

1153. String Transforms Into Another StringVideoPremium

Solution34.9%Hard

Hash Table, String· 1 company

1165. Single-Row KeyboardVideoPremium

Solution87.6%Easy

Hash Table, String· 1 company

1166. Design File SystemVideoPremium

Solution65.1%Medium

Design, Hash Table +2· 12 companies

1181. Before and After PuzzleVideoPremium

Solution51.8%Medium

Array, Hash Table +2· 1 company

1198. Find Smallest Common Element in All RowsVideoPremium

Solution76.5%Medium

Array, Binary Search +3· 2 companies

1213. Intersection of Three Sorted ArraysVideoPremium

Solution80.2%Easy

Array, Binary Search +2· 2 companies

1244. Design A LeaderboardVideoPremium

Solution67.9%Medium

Design, Hash Table +1· 9 companies

1257. Smallest Common RegionVideoPremium

Solution68.6%Medium

Array, Breadth-First Search +4· 1 company

1258. Synonymous SentencesVideoPremium

Solution57.2%Medium

Array, Backtracking +3· 3 companies

1426. Counting ElementsVideoPremium

Solution60.9%Easy

Array, Hash Table· 1 company

1429. First Unique NumberVideoPremium

Solution57.8%Medium

Array, Data Stream +3· 5 companies

Showing 1–50 of 105