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Array70 Database51 Dynamic Programming26 String25 Math22 Depth-First Search18 Hash Table16 Graph15 Binary Search14 Breadth-First Search12 Heap (Priority Queue)12 Sorting12 Tree12 Greedy10 Matrix10 All topics

Hard · Premium · 195 results

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TitleSolutionAcceptDifficultyTopics

158. Read N Characters Given read4 II - Call Multiple TimesVideoPremium

Solution43.2%Hard

Array, Interactive +1· 5 companies

248. Strobogrammatic Number IIIVideoPremium

Solution42.3%Hard

Array, Recursion +1

265. Paint House IIVideoPremium

Solution57.0%Hard

Array, Dynamic Programming· 2 companies

269. Alien DictionaryVideoPremium

Solution37.1%Hard

Array, Breadth-First Search +4· 18 companies

272. Closest Binary Search Tree Value IIVideoPremium

Solution61.1%Hard

Binary Search Tree, Binary Tree +5· 3 companies

296. Best Meeting PointVideoPremium

Solution61.1%Hard

Array, Math +2· 9 companies

302. Smallest Rectangle Enclosing Black PixelsVideoPremium

Solution60.9%Hard

Array, Binary Search +3· 1 company

305. Number of Islands IIVideoPremium

Solution40.5%Hard

Array, Hash Table +1· 10 companies

317. Shortest Distance from All BuildingsVideoPremium

Solution44.9%Hard

Array, Breadth-First Search +1· 15 companies

358. Rearrange String k Distance ApartVideoPremium

Solution39.9%Hard

Counting, Greedy +4· 4 companies

411. Minimum Unique Word AbbreviationVideoPremium

–40.5%Hard

Array, Backtracking +2· 2 companies

425. Word SquaresVideoPremium

Solution54.7%Hard

Array, Backtracking +2· 1 company

428. Serialize and Deserialize N-ary TreeVideoPremium

Solution68.7%Hard

Breadth-First Search, Depth-First Search +2· 7 companies

431. Encode N-ary Tree to Binary TreeVideoPremium

Solution80.6%Hard

Binary Tree, Breadth-First Search +3

465. Optimal Account BalancingVideoPremium

Solution50.9%Hard

Array, Backtracking +3· 12 companies

471. Encode String with Shortest LengthVideoPremium

Solution50.5%Hard

Dynamic Programming, String· 1 company

489. Robot Room CleanerVideoPremium

Solution77.9%Hard

Backtracking, Interactive· 7 companies

499. The Maze IIIVideoPremium

Solution52.3%Hard

Array, Breadth-First Search +6· 1 company

527. Word AbbreviationVideoPremium

Solution62.7%Hard

Array, Greedy +3· 4 companies

548. Split Array with Equal SumVideoPremium

Solution50.1%Hard

Array, Hash Table +1· 1 company

568. Maximum Vacation DaysVideoPremium

Solution46.7%Hard

Array, Dynamic Programming +1· 3 companies

569. Median Employee SalaryVideoPremium

Solution65.9%Hard

Database· 2 companies

571. Find Median Given Frequency of NumbersVideoPremium

Solution42.4%Hard

Database· 1 company

579. Find Cumulative Salary of an EmployeeVideoPremium

Solution49.6%Hard

Database· 1 company

588. Design In-Memory File SystemVideoPremium

Solution48.0%Hard

Design, Hash Table +3· 16 companies

615. Average Salary: Departments VS CompanyVideoPremium

Solution56.2%Hard

618. Students Report By GeographyVideoPremium

Solution63.5%Hard

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

644. Maximum Average Subarray IIVideoPremium

Solution37.7%Hard

Array, Binary Search +1· 1 company

656. Coin PathVideoPremium

Solution34.2%Hard

Array, Dynamic Programming· 1 company

660. Remove 9VideoPremium

–57.3%Hard

Math· 1 company

683. K Empty SlotsVideoPremium

Solution38.0%Hard

Array, Binary Indexed Tree +6· 1 company

711. Number of Distinct Islands IIVideoPremium

Solution55.3%Hard

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

716. Max StackVideoPremium

Solution45.9%Hard

Design, Doubly-Linked List +3· 10 companies

727. Minimum Window SubsequenceVideoPremium

Solution43.5%Hard

Dynamic Programming, Sliding Window +1· 5 companies

759. Employee Free TimeVideoPremium

Solution72.9%Hard

Array, Heap (Priority Queue) +1· 12 companies

772. Basic Calculator IIIVideoPremium

Solution53.2%Hard

Math, Recursion +2· 16 companies

774. Minimize Max Distance to Gas StationVideoPremium

Solution53.9%Hard

Array, Binary Search· 2 companies

1063. Number of Valid SubarraysVideoPremium

Solution79.9%Hard

Array, Monotonic Stack +1· 1 company

1067. Digit Count in RangeVideoPremium

Solution46.4%Hard

Dynamic Programming, Math· 1 company

1088. Confusing Number IIVideoPremium

Solution47.1%Hard

Backtracking, Math· 1 company

1097. Game Play Analysis VVideoPremium

Solution50.8%Hard

Database· 1 company

1121. Divide Array Into Increasing SequencesVideoPremium

Solution65.4%Hard

Array, Counting· 1 company

1127. User Purchase PlatformVideoPremium

Solution46.2%Hard

Database· 1 company

1153. String Transforms Into Another StringVideoPremium

Solution34.9%Hard

Hash Table, String· 1 company

1159. Market Analysis IIVideoPremium

Solution57.4%Hard

Database· 1 company

1168. Optimize Water Distribution in a VillageVideoPremium

Solution65.5%Hard

Graph, Heap (Priority Queue) +2· 2 companies

1183. Maximum Number of OnesVideoPremium

Solution70.6%Hard

Greedy, Heap (Priority Queue)· 1 company

1194. Tournament WinnersVideoPremium

Solution50.2%Hard

Database· 1 company

Showing 1–50 of 195