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Problems

134 problems

Has videoPremium onlyReset
Array578Dynamic Programming332String191Math187Binary Search136Hash Table134Sorting106Greedy104Bit Manipulation103Graph96Depth-First Search91Heap (Priority Queue)78Prefix Sum77Matrix75Breadth-First Search71All topics

Hard · 134 results

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TitleSolutionAcceptDifficultyTopics
3329. Count Substrings With K-Frequency Characters IIVideoPremium
Solution72.2%Hard
Hash Table, Sliding Window +1
3337. Total Characters in String After Transformations IIVideo
Solution58.0%Hard
Counting, Dynamic Programming +3· 2 companies
3351. Sum of Good SubsequencesVideo
Solution30.9%Hard
Array, Dynamic Programming +1· 1 company
3369. Design an Array Statistics Tracker VideoPremium
Solution35.7%Hard
Binary Search, Hash Table +1· 1 company
3378. Count Connected Components in LCM GraphVideo
Solution31.3%Hard
Array, Hash Table +3
3389. Minimum Operations to Make Character Frequencies EqualVideo
–25.8%Hard
Counting, Dynamic Programming +3· 2 companies
3395. Subsequences with a Unique Middle Mode IVideo
–20.7%Hard
Array, Combinatorics +2
3416. Subsequences with a Unique Middle Mode IIPremium
–16.3%Hard
Array, Combinatorics +2
3425. Longest Special PathVideo
–23.2%Hard
Array, Depth-First Search +3
3486. Longest Special Path IIVideo
–19.8%Hard
Array, Depth-First Search +3· 1 company
3505. Minimum Operations to Make Elements Within K Subarrays EqualVideo
–27.8%Hard
Array, Dynamic Programming +4
3509. Maximum Product of Subsequences With an Alternating Sum Equal to KVideo
–13.7%Hard
Array, Dynamic Programming +1· 1 company
3510. Minimum Pair Removal to Sort Array IIVideo
Solution39.1%Hard
Array, Doubly-Linked List +5· 3 companies
3518. Smallest Palindromic Rearrangement IIVideo
Solution44.3%Hard
Combinatorics, Counting +3
3548. Equal Sum Grid Partition IIVideo
Solution39.5%Hard
Array, Enumeration +3· 2 companies
3625. Count Number of Trapezoids IIVideo
Solution40.0%Hard
Array, Geometry +2· 2 companies
3636. Threshold Majority QueriesVideo
–22.5%Hard
Array, Binary Search +4· 4 companies
3715. Sum of Perfect Square AncestorsVideo
–41.3%Hard
Array, Counting +5· 3 companies
3721. Longest Balanced Subarray IIVideo
Solution33.7%Hard
Array, Divide and Conquer +3· 2 companies
3729. Count Distinct Subarrays Divisible by K in Sorted ArrayVideo
Solution27.4%Hard
Array, Hash Table +1
3739. Count Subarrays With Majority Element IIVideo
Solution65.2%Hard
Array, Divide and Conquer +4· 2 companies
3749. Evaluate Valid ExpressionsPremium
Solution69.2%Hard
Divide and Conquer, Hash Table +3
3785. Minimum Swaps to Avoid Forbidden ValuesVideo
–30.4%Hard
Array, Counting +2· 1 company
3816. Lexicographically Smallest String After Deleting Duplicate CharactersVideo
Solution20.9%Hard
Greedy, Hash Table +3· 2 companies
3859. Count Subarrays With K Distinct IntegersVideo
Solution21.0%Hard
Array, Counting +2
3873. Maximum Points Activated with One AdditionVideo
Solution42.8%Hard
Array, Hash Table +1
3934. Smallest Unique SubarrayVideo
Solution39.7%Hard
Array, Binary Search +4
3943. Number of Pairs After IncrementVideo
–20.9%Hard
Array, Counting +2
3948. Lexicographically Maximum MEX ArrayVideo
–53.6%Hard
Array, Greedy +2· 2 companies
3953. Maximum Score with Co-Prime ElementVideo
–27.5%Hard
Array, Combinatorics +4· 2 companies
3962. Maximum Subarray Sum After at Most K SwapsVideo
Solution14.2%Hard
Array, Binary Indexed Tree +5· 1 company
3999. Minimum Number of String Groups Through TransformationsVideo
–47.9%Hard
Hash Table, String +1
4007. Widest Possible FenceVideo
Solution16.9%Hard
Array, Counting +2
4064. Longest Subarray Divisible by K with At Most One Negation IIVideo
Solution24.7%Hard
Array, Binary Search +2
Showing 101–134 of 134