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Problems

34 problems

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DesignArray301Database212Hash Table116String116Depth-First Search78Math78Dynamic Programming76Sorting64Tree63Breadth-First Search53Greedy52Binary Search50Binary Tree48Two Pointers40Matrix39All topics

Premium · 34 results

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TitleSolutionAcceptDifficultyTopics
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
251. Flatten 2D VectorVideoPremium
Solution50.5%Medium
Array, Design +2· 4 companies
271. Encode and Decode StringsVideoPremium
Solution51.9%Medium
Array, Design +1· 11 companies
281. Zigzag IteratorVideoPremium
Solution67.1%Medium
Array, Design +2· 5 companies
288. Unique Word AbbreviationVideoPremium
Solution28.1%Medium
Array, Design +2· 1 company
308. Range Sum Query 2D - MutableVideoPremium
Solution46.0%Medium
Array, Binary Indexed Tree +3· 3 companies
346. Moving Average from Data StreamVideoPremium
Solution80.2%Easy
Array, Data Stream +2· 11 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
359. Logger Rate LimiterVideoPremium
Solution76.8%Easy
Data Stream, Design +1· 21 companies
362. Design Hit CounterVideoPremium
Solution69.6%Medium
Array, Binary Search +3· 25 companies
379. Design Phone DirectoryVideoPremium
Solution53.3%Medium
Array, Design +3· 1 company
431. Encode N-ary Tree to Binary TreeVideoPremium
Solution80.6%Hard
Binary Tree, Breadth-First Search +3
588. Design In-Memory File SystemVideoPremium
Solution48.0%Hard
Design, Hash Table +3· 16 companies
604. Design Compressed String IteratorVideoPremium
Solution40.5%Easy
Array, Design +2· 1 company
631. Design Excel Sum FormulaVideoPremium
–39.3%Hard
Array, Design +3· 9 companies
635. Design Log Storage SystemVideoPremium
Solution59.8%Medium
Design, Hash Table +2· 4 companies
642. Design Search Autocomplete SystemVideoPremium
Solution49.9%Hard
Data Stream, Depth-First Search +5· 12 companies
716. Max StackVideoPremium
Solution45.9%Hard
Design, Doubly-Linked List +3· 10 companies
1166. Design File SystemVideoPremium
Solution65.1%Medium
Design, Hash Table +2· 12 companies
1244. Design A LeaderboardVideoPremium
Solution67.9%Medium
Design, Hash Table +1· 9 companies
1429. First Unique NumberVideoPremium
Solution57.8%Medium
Array, Data Stream +3· 5 companies
1500. Design a File Sharing SystemVideoPremium
Solution41.7%Medium
Data Stream, Design +3· 1 company
1570. Dot Product of Two Sparse VectorsVideoPremium
Solution89.9%Medium
Array, Design +2· 12 companies
1586. Binary Search Tree Iterator IIVideoPremium
Solution63.4%Medium
Binary Search Tree, Binary Tree +4· 1 company
1628. Design an Expression Tree With Evaluate FunctionVideoPremium
Solution82.4%Medium
Array, Binary Tree +4· 1 company
1756. Design Most Recently Used QueueVideoPremium
Solution78.0%Medium
Array, Binary Indexed Tree +4· 2 companies
1804. Implement Trie II (Prefix Tree)VideoPremium
Solution63.6%Medium
Design, Hash Table +2· 2 companies
2254. Design Video Sharing PlatformVideoPremium
–64.1%Hard
Design, Hash Table +2· 1 company
2408. Design SQLVideoPremium
Solution63.9%Medium
Array, Design +2· 2 companies
2590. Design a Todo ListVideoPremium
Solution59.8%Medium
Array, Design +3· 1 company
3391. Design a 3D Binary Matrix with Efficient Layer TrackingVideoPremium
Solution66.1%Medium
Array, Design +4· 1 company
3822. Design Order Management SystemVideoPremium
Solution79.0%Medium
Design, Hash Table· 1 company
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