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Problems

985 problems

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

Hard · 985 results

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TitleSolutionAcceptDifficultyTopics
3617. Find Students with Study Spiral PatternVideo
Solution21.9%Hard
–
3620. Network Recovery PathwaysVideo
Solution50.8%Hard
Array, Binary Search +5· 2 companies
3621. Number of Integers With Popcount-Depth Equal to K IVideo
–23.0%Hard
Bit Manipulation, Combinatorics +2
3624. Number of Integers With Popcount-Depth Equal to K IIVideo
–58.5%Hard
Array, Binary Indexed Tree +2
3625. Count Number of Trapezoids IIVideo
Solution40.0%Hard
Array, Geometry +2· 2 companies
3630. Partition Array for Maximum XOR and ANDVideo
–17.6%Hard
Array, Bit Manipulation +3· 1 company
3632. Subarrays with XOR at Least KPremium
–46.3%Hard
Array, Bit Manipulation +2
3636. Threshold Majority QueriesVideo
–22.5%Hard
Array, Binary Search +4· 4 companies
3640. Trionic Array IIVideo
Solution47.3%Hard
Array, Dynamic Programming· 6 companies
3646. Next Special Palindrome NumberVideo
–28.0%Hard
Backtracking, Bit Manipulation· 1 company
3651. Minimum Cost Path with TeleportationsVideo
Solution45.1%Hard
Array, Dynamic Programming +1· 4 companies
3655. XOR After Range Multiplication Queries IIVideo
Solution47.8%Hard
Array, Divide and Conquer· 2 companies
3661. Maximum Walls Destroyed by RobotsVideo
Solution48.0%Hard
Array, Binary Search +2· 3 companies
3666. Minimum Operations to Equalize Binary StringVideo
Solution45.2%Hard
Breadth-First Search, Math +3· 4 companies
3671. Sum of Beautiful SubsequencesVideo
–31.5%Hard
Array, Binary Indexed Tree +2· 2 companies
3673. Find Zombie SessionsVideo
Solution53.3%Hard
–
3677. Count Binary Palindromic NumbersVideo
–33.2%Hard
Bit Manipulation, Math
3681. Maximum XOR of SubsequencesVideo
–49.5%Hard
Array, Bit Manipulation +2
3686. Number of Stable SubsequencesVideo
–58.9%Hard
Array, Dynamic Programming· 1 company
3691. Maximum Total Subarray Value IIVideo
Solution41.6%Hard
Array, Greedy +2· 3 companies
3695. Maximize Alternating Sum Using SwapsVideo
–62.5%Hard
Array, Greedy +2· 1 company
3699. Number of ZigZag Arrays IVideo
Solution50.2%Hard
Dynamic Programming, Prefix Sum· 5 companies
3700. Number of ZigZag Arrays IIVideo
Solution67.7%Hard
Dynamic Programming, Math· 3 companies
3704. Count No-Zero Pairs That Sum to NVideo
Solution15.6%Hard
Dynamic Programming, Math
3710. Maximum Partition FactorVideo
–31.8%Hard
Array, Binary Search +4· 2 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
3725. Count Ways to Choose Coprime Integers from RowsVideo
–46.8%Hard
Array, Combinatorics +4
3729. Count Distinct Subarrays Divisible by K in Sorted ArrayVideo
Solution27.4%Hard
Array, Hash Table +1
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
3739. Count Subarrays With Majority Element IIVideo
Solution65.2%Hard
Array, Divide and Conquer +4· 2 companies
3743. Maximize Cyclic Partition ScoreVideo
–14.5%Hard
Array, Dynamic Programming· 2 companies
3748. Count Stable SubarraysVideo
Solution31.9%Hard
Array, Binary Search +1
3749. Evaluate Valid ExpressionsPremium
Solution69.2%Hard
Divide and Conquer, Hash Table +3
3753. Total Waviness of Numbers in Range IIVideo
Solution56.2%Hard
Dynamic Programming, Math· 4 companies
3757. Number of Effective SubsequencesVideo
–30.4%Hard
Array, Bit Manipulation +3
3762. Minimum Operations to Equalize SubarraysVideo
–20.0%Hard
Array, Binary Search +2
3764. Most Common Course PairsVideo
Solution56.6%Hard
–
3768. Minimum Inversion Count in Subarrays of Fixed LengthVideo
–40.3%Hard
Array, Segment Tree +1
3772. Maximum Subgraph Score in a TreeVideo
–65.4%Hard
Array, Depth-First Search +2· 1 company
3777. Minimum Deletions to Make Alternating SubstringVideo
Solution43.0%Hard
Segment Tree, String
3782. Last Remaining Integer After Alternating Deletion OperationsVideo
–46.3%Hard
Math, Recursion
3785. Minimum Swaps to Avoid Forbidden ValuesVideo
–30.4%Hard
Array, Counting +2· 1 company
3786. Total Sum of Interaction Cost in Tree GroupsVideo
–50.8%Hard
Array, Depth-First Search +1· 1 company
3791. Number of Balanced Integers in a RangeVideo
Solution35.0%Hard
Dynamic Programming
3797. Count Routes to Climb a Rectangular GridVideo
–23.1%Hard
Array, Dynamic Programming +2· 1 company
3801. Minimum Cost to Merge Sorted ListsVideo
Solution33.8%Hard
Array, Binary Search +3
3802. Number of Ways to Paint SheetsPremium
–66.7%Hard
–
3806. Maximum Bitwise AND After Increment OperationsVideo
Solution31.8%Hard
Array, Bit Manipulation +2· 1 company
Showing 851–900 of 985