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Array301 Database212 Hash Table116 String116 Depth-First Search78 Math78 Dynamic Programming76 Sorting64 Tree63 Breadth-First Search53 Greedy52 Binary Search50 Binary Tree48 Two Pointers40 Matrix39 All topics

Premium · 116 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

161. One Edit DistanceVideoPremium

Solution34.4%Medium

String, Two Pointers· 8 companies

186. Reverse Words in a String IIVideoPremium

Solution56.6%Medium

String, Two Pointers· 4 companies

243. Shortest Word DistanceVideoPremium

Solution66.3%Easy

Array, String· 8 companies

244. Shortest Word Distance IIVideoPremium

Solution62.8%Medium

Array, Design +3· 4 companies

245. Shortest Word Distance IIIVideoPremium

Solution59.4%Medium

Array, String· 2 companies

246. Strobogrammatic NumberVideoPremium

Solution47.6%Easy

Hash Table, String +1· 2 companies

247. Strobogrammatic Number IIVideoPremium

Solution53.5%Medium

Array, Recursion +1· 2 companies

248. Strobogrammatic Number IIIVideoPremium

Solution42.3%Hard

Array, Recursion +1

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

269. Alien DictionaryVideoPremium

Solution37.1%Hard

Array, Breadth-First Search +4· 18 companies

271. Encode and Decode StringsVideoPremium

Solution51.9%Medium

Array, Design +1· 11 companies

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

293. Flip GameVideoPremium

Solution64.8%Easy

String· 1 company

320. Generalized AbbreviationVideoPremium

Solution61.0%Medium

Backtracking, Bit Manipulation +1· 1 company

340. Longest Substring with At Most K Distinct CharactersVideoPremium

Solution49.9%Medium

Hash Table, Sliding Window +1· 12 companies

358. Rearrange String k Distance ApartVideoPremium

Solution39.9%Hard

Counting, Greedy +4· 4 companies

408. Valid Word AbbreviationVideoPremium

Solution37.0%Easy

String, Two Pointers· 7 companies

411. Minimum Unique Word AbbreviationVideoPremium

–40.5%Hard

Array, Backtracking +2· 2 companies

418. Sentence Screen FittingVideoPremium

Solution36.3%Medium

Array, Dynamic Programming +1· 1 company

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

439. Ternary Expression ParserVideoPremium

Solution62.6%Medium

Recursion, Stack +1· 1 company

471. Encode String with Shortest LengthVideoPremium

Solution50.5%Hard

Dynamic Programming, String· 1 company

484. Find PermutationVideoPremium

Solution67.0%Medium

Array, Greedy +2· 1 company

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

536. Construct Binary Tree from StringVideoPremium

Solution58.7%Medium

Binary Tree, Depth-First Search +3· 3 companies

544. Output Contest MatchesVideoPremium

Solution77.3%Medium

Recursion, Simulation +1· 1 company

555. Split Concatenated StringsVideoPremium

Solution43.4%Medium

Array, Greedy +1· 1 company

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

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

642. Design Search Autocomplete SystemVideoPremium

Solution49.9%Hard

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

681. Next Closest TimeVideoPremium

Solution46.8%Medium

Backtracking, Enumeration +2· 1 company

727. Minimum Window SubsequenceVideoPremium

Solution43.5%Hard

Dynamic Programming, Sliding Window +1· 5 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

751. IP to CIDRVideoPremium

–53.7%Medium

Bit Manipulation, String· 4 companies

758. Bold Words in StringVideoPremium

Solution53.2%Medium

Array, Hash Table +3· 1 company

772. Basic Calculator IIIVideoPremium

Solution53.2%Hard

Math, Recursion +2· 16 companies

800. Similar RGB ColorVideoPremium

Solution68.6%Easy

Enumeration, Math +1· 1 company

1055. Shortest Way to Form StringVideoPremium

Solution61.6%Medium

Binary Search, Greedy +2· 3 companies

1058. Minimize Rounding Error to Meet TargetVideoPremium

Solution45.9%Medium

Array, Greedy +3· 1 company

1062. Longest Repeating SubstringVideoPremium

Solution63.4%Medium

Binary Search, Dynamic Programming +4· 4 companies

1065. Index Pairs of a StringVideoPremium

Solution68.6%Easy

Array, Sorting +2· 1 company

Showing 1–50 of 116