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Problems

25 problems

Has videoPremium onlyReset
Array70Database51Dynamic Programming26String25Math22Depth-First Search18Hash Table16Graph15Binary Search14Breadth-First Search12Heap (Priority Queue)12Sorting12Tree12Greedy10Matrix10All topics

Hard · Premium · 25 results

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TitleSolutionAcceptDifficultyTopics
248. Strobogrammatic Number IIIVideoPremium
Solution42.3%Hard
Array, Recursion +1
269. Alien DictionaryVideoPremium
Solution37.1%Hard
Array, Breadth-First Search +4· 18 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
471. Encode String with Shortest LengthVideoPremium
Solution50.5%Hard
Dynamic Programming, String· 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
588. Design In-Memory File SystemVideoPremium
Solution48.0%Hard
Design, Hash Table +3· 16 companies
642. Design Search Autocomplete SystemVideoPremium
Solution49.9%Hard
Data Stream, Depth-First Search +5· 12 companies
727. Minimum Window SubsequenceVideoPremium
Solution43.5%Hard
Dynamic Programming, Sliding Window +1· 5 companies
772. Basic Calculator IIIVideoPremium
Solution53.2%Hard
Math, Recursion +2· 16 companies
1153. String Transforms Into Another StringVideoPremium
Solution34.9%Hard
Hash Table, String· 1 company
1216. Valid Palindrome IIIVideoPremium
Solution49.2%Hard
Dynamic Programming, String· 3 companies
1597. Build Binary Expression Tree From Infix ExpressionVideoPremium
–62.5%Hard
Binary Tree, Stack +2· 1 company
1842. Next Palindrome Using Same DigitsVideoPremium
Solution54.2%Hard
String, Two Pointers· 1 company
2868. The Wording GamePremium
Solution53.6%Hard
Array, Game Theory +4
3088. Make String Anti-palindromeVideoPremium
Solution46.6%Hard
Counting Sort, Greedy +2· 1 company
3104. Find Longest Self-Contained SubstringVideoPremium
Solution58.6%Hard
Binary Search, Hash Table +2· 1 company
3279. Maximum Total Area Occupied by PistonsVideoPremium
Solution41.3%Hard
Array, Counting +4
3329. Count Substrings With K-Frequency Characters IIVideoPremium
Solution72.2%Hard
Hash Table, Sliding Window +1
3406. Find the Lexicographically Largest String From the Box IIVideoPremium
Solution48.9%Hard
String, Two Pointers
3735. Lexicographically Smallest String After Reverse IIPremium
–49.0%Hard
Binary Search, Hash Function +3
3749. Evaluate Valid ExpressionsPremium
Solution69.2%Hard
Divide and Conquer, Hash Table +3
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