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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

3292. Minimum Number of Valid Strings to Form Target IIVideo

Solution21.1%Hard

Array, Binary Search +6

3298. Count Substrings That Can Be Rearranged to Contain a String IIVideo

Solution55.2%Hard

Hash Table, Sliding Window +1

3303. Find the Occurrence of First Almost Equal SubstringVideo

Solution16.0%Hard

String, String Matching· 1 company

3320. Count The Number of Winning SequencesVideo

Solution32.4%Hard

Dynamic Programming, String· 1 company

3327. Check if DFS Strings Are PalindromesVideo

Solution20.9%Hard

Array, Depth-First Search +4· 1 company

3329. Count Substrings With K-Frequency Characters IIVideoPremium

Solution72.2%Hard

Hash Table, Sliding Window +1

3333. Find the Original Typed String IIVideo

Solution45.6%Hard

Dynamic Programming, Prefix Sum +1· 5 companies

3337. Total Characters in String After Transformations IIVideo

Solution58.0%Hard

Counting, Dynamic Programming +3· 2 companies

3343. Count Number of Balanced PermutationsVideo

Solution49.1%Hard

Combinatorics, Dynamic Programming +2· 2 companies

3348. Smallest Divisible Digit Product IIVideo

Solution45.3%Hard

Backtracking, Greedy +3· 3 companies

3352. Count K-Reducible Numbers Less Than NVideo

Solution27.8%Hard

Combinatorics, Dynamic Programming +2· 1 company

3389. Minimum Operations to Make Character Frequencies EqualVideo

–25.8%Hard

Counting, Dynamic Programming +3· 2 companies

3399. Smallest Substring With Identical Characters IIVideo

Solution39.0%Hard

Binary Search, String· 1 company

3406. Find the Lexicographically Largest String From the Box IIVideoPremium

Solution48.9%Hard

String, Two Pointers

3435. Frequencies of Shortest SupersequencesVideo

–22.2%Hard

Array, Bit Manipulation +4· 1 company

3441. Minimum Cost Good CaptionVideo

–20.5%Hard

Dynamic Programming, String· 2 companies

3445. Maximum Difference Between Even and Odd Frequency IIVideo

Solution48.7%Hard

Enumeration, Prefix Sum +2· 6 companies

3448. Count Substrings Divisible By Last DigitVideo

–23.7%Hard

Dynamic Programming, String· 1 company

3455. Shortest Matching SubstringVideo

Solution24.5%Hard

Binary Search, String +2· 1 company

3463. Check If Digits Are Equal in String After Operations IIVideo

–14.3%Hard

Combinatorics, Math +2· 2 companies

3474. Lexicographically Smallest Generated StringVideo

Solution53.3%Hard

Greedy, String +1· 5 companies

3485. Longest Common Prefix of K Strings After RemovalVideo

Solution24.3%Hard

Array, String +1

3501. Maximize Active Section with Trade IIVideo

Solution64.7%Hard

Array, Binary Search +2

3504. Longest Palindrome After Substring Concatenation IIVideo

Solution18.4%Hard

Dynamic Programming, String +1· 1 company

3518. Smallest Palindromic Rearrangement IIVideo

Solution44.3%Hard

Combinatorics, Counting +3

3519. Count Numbers with Non-Decreasing Digits Video

–37.3%Hard

Dynamic Programming, Math +1

3563. Lexicographically Smallest String After Adjacent RemovalsVideo

–17.9%Hard

Dynamic Programming, String

3579. Minimum Steps to Convert String with OperationsVideo

Solution42.5%Hard

Dynamic Programming, String

3614. Process String with Special Operations IIVideo

Solution39.9%Hard

Simulation, String· 3 companies

3615. Longest Palindromic Path in GraphVideo

–22.6%Hard

Bit Manipulation, Bitmask +3· 1 company

3666. Minimum Operations to Equalize Binary StringVideo

Solution45.2%Hard

Breadth-First Search, Math +3· 4 companies

3734. Lexicographically Smallest Palindromic Permutation Greater Than TargetVideo

Solution55.3%Hard

Enumeration, String +1

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

3777. Minimum Deletions to Make Alternating SubstringVideo

Solution43.0%Hard

Segment Tree, String

3816. Lexicographically Smallest String After Deleting Duplicate CharactersVideo

Solution20.9%Hard

Greedy, Hash Table +3· 2 companies

3841. Palindromic Path Queries in a TreeVideo

–34.8%Hard

Array, Divide and Conquer +3

3864. Minimum Cost to Partition a Binary StringVideo

Solution50.5%Hard

Divide and Conquer, Prefix Sum +1· 1 company

3981. Count Distinct Ways to Form Target from Two StringsVideo

–46.4%Hard

Dynamic Programming, Prefix Sum +1

3995. Minimum Cost to Convert String IIIVideo

–55.6%Hard

Array, Dynamic Programming +1

3999. Minimum Number of String Groups Through TransformationsVideo

–47.9%Hard

Hash Table, String +1

Showing 151–191 of 191