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Problems

30 problems

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Design Array578 Dynamic Programming332 String191 Math187 Binary Search136 Hash Table134 Sorting106 Greedy104 Bit Manipulation103 Graph96 Depth-First Search91 Heap (Priority Queue)78 Prefix Sum77 Matrix75 Breadth-First Search71 All topics

Hard · 30 results

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TitleSolutionAcceptDifficultyTopics

295. Find Median from Data StreamVideo

Solution54.9%Hard

Data Stream, Design +3· 40 companies

297. Serialize and Deserialize Binary TreeVideo

Solution61.1%Hard

Binary Tree, Breadth-First Search +4· 23 companies

352. Data Stream as Disjoint IntervalsVideo

Solution60.8%Hard

Binary Search, Design +1· 2 companies

381. Insert Delete GetRandom O(1) - Duplicates allowedVideo

Solution37.1%Hard

Array, Design +3· 11 companies

431. Encode N-ary Tree to Binary TreeVideoPremium

Solution80.6%Hard

Binary Tree, Breadth-First Search +3

432. All O`one Data StructureVideo

Solution44.2%Hard

Design, Doubly-Linked List +2· 13 companies

460. LFU CacheVideo

Solution50.0%Hard

Design, Doubly-Linked List +2· 32 companies

588. Design In-Memory File SystemVideoPremium

Solution48.0%Hard

Design, Hash Table +3· 16 companies

631. Design Excel Sum FormulaVideoPremium

–39.3%Hard

Array, Design +3· 9 companies

642. Design Search Autocomplete SystemVideoPremium

Solution49.9%Hard

Data Stream, Depth-First Search +5· 12 companies

715. Range ModuleVideo

Solution45.4%Hard

Design, Ordered Set +1· 5 companies

716. Max StackVideoPremium

Solution45.9%Hard

Design, Doubly-Linked List +3· 10 companies

732. My Calendar IIIVideo

Solution72.4%Hard

Binary Search, Design +3· 1 company

745. Prefix and Suffix SearchVideo

Solution41.2%Hard

Array, Design +3· 3 companies

895. Maximum Frequency StackVideo

Solution67.1%Hard

Design, Hash Table +2· 12 companies

1032. Stream of CharactersVideo

Solution52.8%Hard

Array, Data Stream +3· 4 companies

1157. Online Majority Element In SubarrayVideo

Solution40.9%Hard

Array, Binary Indexed Tree +3· 1 company

1172. Dinner Plate StacksVideo

Solution34.2%Hard

Design, Hash Table +2· 2 companies

1206. Design SkiplistVideo

Solution59.7%Hard

Design, Linked List· 8 companies

1483. Kth Ancestor of a Tree NodeVideo

Solution39.7%Hard

Binary Search, Breadth-First Search +4· 3 companies

1622. Fancy SequenceVideo

Solution41.3%Hard

Design, Math +1· 3 companies

1825. Finding MK AverageVideo

Solution38.7%Hard

Data Stream, Design +3· 1 company

1912. Design Movie Rental SystemVideo

Solution62.5%Hard

Array, Design +3· 2 companies

2102. Sequentially Ordinal Rank TrackerVideo

Solution61.5%Hard

Data Stream, Design +2· 1 company

2227. Encrypt and Decrypt StringsVideo

Solution38.8%Hard

Array, Design +3· 3 companies

2254. Design Video Sharing PlatformVideoPremium

–64.1%Hard

Design, Hash Table +2· 1 company

2276. Count Integers in IntervalsVideo

Solution36.1%Hard

Design, Ordered Set +1· 4 companies

2286. Booking Concert Tickets in GroupsVideo

Solution20.1%Hard

Binary Indexed Tree, Binary Search +2· 1 company

2296. Design a Text EditorVideo

Solution52.1%Hard

Design, Doubly-Linked List +4· 10 companies

2642. Design Graph With Shortest Path CalculatorVideo

Solution65.6%Hard

Design, Graph +2· 2 companies

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