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Problems

437 problems

Has videoPremium onlyReset
Array1,212Hash Table473String437Math331Greedy330Dynamic Programming327Sorting302Depth-First Search208Binary Search189Breadth-First Search166Matrix163Tree158Prefix Sum155Two Pointers150Database137All topics

Medium · 437 results

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TitleSolutionAcceptDifficultyTopics
402. Remove K DigitsVideo
Solution37.7%Medium
Greedy, Monotonic Stack +2· 21 companies
418. Sentence Screen FittingVideoPremium
Solution36.3%Medium
Array, Dynamic Programming +1· 1 company
423. Reconstruct Original Digits from EnglishVideo
Solution53.4%Medium
Hash Table, Math +1· 4 companies
424. Longest Repeating Character ReplacementVideo
Solution60.4%Medium
Hash Table, Sliding Window +1· 22 companies
433. Minimum Genetic MutationVideo
Solution57.1%Medium
Breadth-First Search, Hash Table +1· 6 companies
438. Find All Anagrams in a StringVideo
Solution54.7%Medium
Hash Table, Sliding Window +1· 15 companies
439. Ternary Expression ParserVideoPremium
Solution62.6%Medium
Recursion, Stack +1· 1 company
443. String CompressionVideo
Solution60.9%Medium
String, Two Pointers· 41 companies
449. Serialize and Deserialize BSTVideo
Solution60.1%Medium
Binary Search Tree, Binary Tree +5· 4 companies
451. Sort Characters By FrequencyVideo
Solution75.8%Medium
Bucket Sort, Counting +4· 16 companies
467. Unique Substrings in Wraparound StringVideo
Solution44.0%Medium
Dynamic Programming, String· 2 companies
468. Validate IP AddressVideo
Solution28.2%Medium
String· 12 companies
474. Ones and ZeroesVideo
Solution53.7%Medium
Array, Dynamic Programming +1· 5 companies
481. Magical StringVideo
Solution56.6%Medium
String, Two Pointers· 3 companies
484. Find PermutationVideoPremium
Solution67.0%Medium
Array, Greedy +2· 1 company
516. Longest Palindromic SubsequenceVideo
Solution65.8%Medium
Dynamic Programming, String· 15 companies
522. Longest Uncommon Subsequence IIVideo
Solution45.8%Medium
Array, Hash Table +3· 1 company
524. Longest Word in Dictionary through DeletingVideo
Solution53.2%Medium
Array, Sorting +2· 2 companies
535. Encode and Decode TinyURLVideo
Solution86.5%Medium
Design, Hash Function +2· 9 companies
536. Construct Binary Tree from StringVideoPremium
Solution58.7%Medium
Binary Tree, Depth-First Search +3· 3 companies
537. Complex Number MultiplicationVideo
Solution73.9%Medium
Math, Simulation +1· 3 companies
539. Minimum Time DifferenceVideo
Solution62.7%Medium
Array, Math +2· 9 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
556. Next Greater Element IIIVideo
Solution35.2%Medium
Math, String +1· 11 companies
567. Permutation in StringVideo
Solution49.8%Medium
Hash Table, Sliding Window +2· 16 companies
583. Delete Operation for Two StringsVideo
Solution66.0%Medium
Dynamic Programming, String· 4 companies
592. Fraction Addition and SubtractionVideo
Solution66.6%Medium
Math, Simulation +1· 5 companies
606. Construct String from Binary TreeVideo
Solution70.6%Medium
Binary Tree, Depth-First Search +2· 3 companies
609. Find Duplicate File in SystemVideo
Solution67.6%Medium
Array, Hash Table +1· 7 companies
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
640. Solve the EquationVideo
Solution46.7%Medium
Math, Simulation +1· 2 companies
647. Palindromic SubstringsVideo
Solution73.2%Medium
Dynamic Programming, String +1· 25 companies
648. Replace WordsVideo
Solution68.7%Medium
Array, Hash Table +2· 4 companies
649. Dota2 SenateVideo
Solution50.3%Medium
Greedy, Queue +1· 6 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
678. Valid Parenthesis StringVideo
Solution42.8%Medium
Dynamic Programming, Greedy +2· 15 companies
681. Next Closest TimeVideoPremium
Solution46.8%Medium
Backtracking, Enumeration +2· 1 company
686. Repeated String MatchVideo
Solution39.7%Medium
String, String Matching· 6 companies
692. Top K Frequent WordsVideo
Solution60.6%Medium
Bucket Sort, Counting +5· 23 companies
712. Minimum ASCII Delete Sum for Two StringsVideo
Solution70.9%Medium
Dynamic Programming, String· 4 companies
720. Longest Word in DictionaryVideo
Solution55.2%Medium
Array, Hash Table +3· 3 companies
721. Accounts MergeVideo
Solution62.2%Medium
Array, Breadth-First Search +5· 17 companies
722. Remove CommentsVideo
Solution40.1%Medium
Array, String· 4 companies
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
752. Open the LockVideo
Solution61.2%Medium
Array, Breadth-First Search +2· 15 companies
758. Bold Words in StringVideoPremium
Solution53.2%Medium
Array, Hash Table +3· 1 company
Showing 51–100 of 437