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Problems

88 problems

Has videoPremium onlyReset
DesignArray1,196Hash Table465String434Greedy327Math327Dynamic Programming324Sorting300Depth-First Search208Binary Search187Breadth-First Search165Matrix163Tree157Prefix Sum153Two Pointers148Database135All topics

Medium · With video · 88 results

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TitleSolutionAcceptDifficultyTopics
146. LRU CacheVideo
Solution48.2%Medium
Design, Doubly-Linked List +2· 120 companies
155. Min StackVideo
Solution58.5%Medium
Design, Stack· 37 companies
173. Binary Search Tree IteratorVideo
Solution76.9%Medium
Binary Search Tree, Binary Tree +4· 8 companies
208. Implement Trie (Prefix Tree)Video
Solution69.9%Medium
Design, Hash Table +2· 21 companies
211. Design Add and Search Words Data StructureVideo
Solution48.9%Medium
Depth-First Search, Design +2· 13 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
284. Peeking IteratorVideo
Solution61.9%Medium
Array, Design +1· 3 companies
288. Unique Word AbbreviationVideoPremium
Solution28.1%Medium
Array, Design +2· 1 company
304. Range Sum Query 2D - ImmutableVideo
Solution59.2%Medium
Array, Design +2· 10 companies
307. Range Sum Query - MutableVideo
Solution43.9%Medium
Array, Binary Indexed Tree +2· 4 companies
308. Range Sum Query 2D - MutableVideoPremium
Solution46.0%Medium
Array, Binary Indexed Tree +3· 3 companies
341. Flatten Nested List IteratorVideo
Solution65.6%Medium
Depth-First Search, Design +4· 19 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
355. Design TwitterVideo
Solution45.6%Medium
Design, Hash Table +2· 14 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
380. Insert Delete GetRandom O(1)Video
Solution55.3%Medium
Array, Design +3· 38 companies
384. Shuffle an ArrayVideo
Solution59.6%Medium
Array, Design +2· 8 companies
449. Serialize and Deserialize BSTVideo
Solution60.1%Medium
Binary Search Tree, Binary Tree +5· 4 companies
535. Encode and Decode TinyURLVideo
Solution86.5%Medium
Design, Hash Function +2· 9 companies
622. Design Circular QueueVideo
Solution55.4%Medium
Array, Design +2· 21 companies
635. Design Log Storage SystemVideoPremium
Solution59.8%Medium
Design, Hash Table +2· 4 companies
641. Design Circular DequeVideo
Solution65.2%Medium
Array, Design +2· 5 companies
676. Implement Magic DictionaryVideo
Solution57.8%Medium
Depth-First Search, Design +3· 2 companies
677. Map Sum PairsVideo
Solution57.4%Medium
Design, Hash Table +2· 3 companies
707. Design Linked ListVideo
Solution30.6%Medium
Design, Linked List· 6 companies
729. My Calendar IVideo
Solution58.4%Medium
Array, Binary Search +3· 12 companies
731. My Calendar IIVideo
Solution63.3%Medium
Array, Binary Search +4· 3 companies
855. Exam RoomVideo
Solution43.6%Medium
Design, Heap (Priority Queue) +1· 6 companies
900. RLE IteratorVideo
Solution59.6%Medium
Array, Counting +2· 2 companies
901. Online Stock SpanVideo
Solution69.5%Medium
Data Stream, Design +2· 7 companies
911. Online ElectionVideo
Solution52.8%Medium
Array, Binary Search +2· 3 companies
919. Complete Binary Tree InserterVideo
Solution65.0%Medium
Binary Tree, Breadth-First Search +2· 3 companies
981. Time Based Key-Value StoreVideo
Solution49.8%Medium
Binary Search, Design +2· 34 companies
1146. Snapshot ArrayVideo
Solution36.8%Medium
Array, Binary Search +2· 20 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
1261. Find Elements in a Contaminated Binary TreeVideo
Solution84.1%Medium
Binary Tree, Breadth-First Search +4· 2 companies
1286. Iterator for CombinationVideo
Solution72.7%Medium
Backtracking, Design +2· 1 company
1348. Tweet Counts Per FrequencyVideo
Solution46.6%Medium
Binary Search, Design +3· 4 companies
1352. Product of the Last K NumbersVideo
Solution62.9%Medium
Array, Data Stream +3· 11 companies
1357. Apply Discount Every n OrdersVideo
Solution66.1%Medium
Array, Design +1· 1 company
1381. Design a Stack With Increment OperationVideo
Solution79.9%Medium
Array, Design +1· 6 companies
1396. Design Underground SystemVideo
Solution74.8%Medium
Design, Hash Table +1· 7 companies
1429. First Unique NumberVideoPremium
Solution57.8%Medium
Array, Data Stream +3· 5 companies
1472. Design Browser HistoryVideo
Solution78.3%Medium
Array, Data Stream +4· 13 companies
Showing 1–50 of 88