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191 problems

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Array578 Dynamic Programming332 String191 Math187 Binary Search136 Hash Table134 Sorting106 Greedy104 Bit Manipulation103 Graph96 Depth-First Search91 Heap (Priority Queue)78 Prefix Sum77 Matrix75 Breadth-First Search71 All topics

Hard · 191 results

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TitleSolutionAcceptDifficultyTopics

2030. Smallest K-Length Subsequence With Occurrences of a LetterVideo

Solution40.0%Hard

Greedy, Monotonic Stack +2· 1 company

2056. Number of Valid Move Combinations On ChessboardVideo

Solution48.7%Hard

Array, Backtracking +2· 2 companies

2060. Check if an Original String Exists Given Two Encoded StringsVideo

Solution43.6%Hard

Dynamic Programming, String· 2 companies

2147. Number of Ways to Divide a Long CorridorVideo

Solution54.6%Hard

Dynamic Programming, Math +1· 3 companies

2156. Find Substring With Given Hash ValueVideo

Solution27.3%Hard

Hash Function, Rolling Hash +2· 1 company

2157. Groups of StringsVideo

Solution28.2%Hard

Bit Manipulation, String +1· 1 company

2167. Minimum Time to Remove All Cars Containing Illegal GoodsVideo

Solution42.2%Hard

Dynamic Programming, String· 1 company

2193. Minimum Number of Moves to Make PalindromeVideo

Solution52.7%Hard

Binary Indexed Tree, Greedy +2· 5 companies

2209. Minimum White Tiles After Covering With CarpetsVideo

Solution39.3%Hard

Dynamic Programming, Prefix Sum +1· 1 company

2213. Longest Substring of One Repeating CharacterVideo

Solution65.8%Hard

Array, Ordered Set +2· 1 company

2223. Sum of Scores of Built StringsVideo

Solution51.0%Hard

Binary Search, Hash Function +4· 1 company

2227. Encrypt and Decrypt StringsVideo

Solution38.8%Hard

Array, Design +3· 3 companies

2246. Longest Path With Different Adjacent CharactersVideo

Solution54.2%Hard

Array, Depth-First Search +4· 5 companies

2262. Total Appeal of A StringVideo

Solution56.4%Hard

Dynamic Programming, Hash Table +1· 2 companies

2296. Design a Text EditorVideo

Solution52.1%Hard

Design, Doubly-Linked List +4· 10 companies

2301. Match Substring After ReplacementVideo

Solution43.3%Hard

Array, Hash Table +2· 1 company

2306. Naming a CompanyVideo

Solution46.4%Hard

Array, Bit Manipulation +3· 1 company

2416. Sum of Prefix Scores of StringsVideo

Solution60.6%Hard

Array, Counting +2· 3 companies

2430. Maximum Deletions on a StringVideo

Solution36.4%Hard

Dynamic Programming, Hash Function +3· 1 company

2468. Split Message Based on LimitVideo

Solution42.1%Hard

Binary Search, String· 5 companies

2472. Maximum Number of Non-overlapping Palindrome SubstringsVideo

Solution60.9%Hard

Dynamic Programming, Greedy +2· 5 companies

2478. Number of Beautiful PartitionsVideo

Solution33.5%Hard

Dynamic Programming, String· 1 company

2484. Count Palindromic SubsequencesVideo

Solution41.7%Hard

Dynamic Programming, String· 11 companies

2514. Count AnagramsVideo

Solution38.4%Hard

Combinatorics, Counting +3· 1 company

2565. Subsequence With the Minimum ScoreVideo

Solution33.8%Hard

Binary Search, String +1· 1 company

2573. Find the String with LCPVideo

Solution63.3%Hard

Array, Dynamic Programming +4· 1 company

2663. Lexicographically Smallest Beautiful StringVideo

Solution37.9%Hard

Greedy, String· 2 companies

2719. Count of IntegersVideo

Solution38.9%Hard

Dynamic Programming, Math +1· 2 companies

2781. Length of the Longest Valid SubstringVideo

Solution38.3%Hard

Array, Hash Table +2· 3 companies

2801. Count Stepping Numbers in RangeVideo

Solution28.7%Hard

Dynamic Programming, String· 2 companies

2842. Count K-Subsequences of a String With Maximum BeautyVideo

Solution30.2%Hard

Combinatorics, Greedy +3· 1 company

2851. String TransformationVideo

Solution27.4%Hard

Dynamic Programming, Math +2· 3 companies

2868. The Wording GamePremium

Solution53.6%Hard

Array, Game Theory +4

2911. Minimum Changes to Make K Semi-palindromesVideo

Solution35.3%Hard

Dynamic Programming, String +1

2949. Count Beautiful Substrings IIVideo

Solution27.5%Hard

Hash Table, Math +3· 1 company

2953. Count Complete SubstringsVideo

Solution31.3%Hard

Hash Table, Sliding Window +1· 1 company

2977. Minimum Cost to Convert String IIVideo

Solution59.1%Hard

Array, Dynamic Programming +4· 4 companies

2983. Palindrome Rearrangement QueriesVideo

Solution24.4%Hard

Hash Table, Prefix Sum +1

2999. Count the Number of Powerful IntegersVideo

Solution46.3%Hard

Dynamic Programming, Math +1· 5 companies

3003. Maximize the Number of Partitions After OperationsVideo

Solution53.5%Hard

Bit Manipulation, Bitmask +2· 1 company

3008. Find Beautiful Indices in the Given Array IIVideo

Solution28.3%Hard

Binary Search, Hash Function +4· 3 companies

3031. Minimum Time to Revert Word to Initial State IIVideo

Solution35.1%Hard

Hash Function, Rolling Hash +2· 1 company

3045. Count Prefix and Suffix Pairs IIVideo

Solution28.2%Hard

Array, Hash Function +4· 4 companies

3088. Make String Anti-palindromeVideoPremium

Solution46.6%Hard

Counting Sort, Greedy +2· 1 company

3093. Longest Common Suffix QueriesVideo

Solution52.8%Hard

Array, String +1· 2 companies

3104. Find Longest Self-Contained SubstringVideoPremium

Solution58.6%Hard

Binary Search, Hash Table +2· 1 company

3213. Construct String with Minimum CostVideo

Solution19.0%Hard

Array, Dynamic Programming +2· 1 company

3260. Find the Largest Palindrome Divisible by KVideo

Solution17.0%Hard

Dynamic Programming, Greedy +3· 2 companies

3261. Count Substrings That Satisfy K-Constraint IIVideo

Solution24.1%Hard

Array, Binary Search +3

3279. Maximum Total Area Occupied by PistonsVideoPremium

Solution41.3%Hard

Array, Counting +4

Showing 101–150 of 191