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Array301 Database212 Hash Table116 String116 Depth-First Search78 Math78 Dynamic Programming76 Sorting64 Tree63 Breadth-First Search53 Greedy52 Binary Search50 Binary Tree48 Two Pointers40 Matrix39 All topics

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TitleSolutionAcceptDifficultyTopics

3817. Good Indices in a Digit StringVideoPremium

Solution85.3%Medium

3822. Design Order Management SystemVideoPremium

Solution79.0%Medium

Design, Hash Table· 1 company

3831. Median of a Binary Search Tree LevelVideoPremium

Solution86.4%Medium

Binary Search Tree, Binary Tree +3

3837. Delayed Count of Equal ElementsPremium

Solution49.2%Medium

Array, Counting +1· 1 company

3846. Total Distance to Type a String Using One FingerVideoPremium

Solution89.9%Medium

Hash Table, String

3851. Maximum Requests Without Violating the LimitPremium

Solution64.7%Medium

Array, Greedy +3

3860. Unique Email GroupsPremium

Solution84.8%Medium

Array, Hash Table +1

3865. Reverse K SubarraysPremium

Solution88.6%Medium

Array, Two Pointers

3874. Valid Subarrays With Exactly One PeakPremium

Solution67.5%Medium

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3879. Maximum Distinct Path Sum in a Binary TreePremium

Solution51.2%Medium

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3888. Minimum Operations to Make All Grid Elements EqualPremium

Solution38.1%Hard

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3893. Maximum Team Size with Overlapping IntervalsPremium

Solution42.6%Medium

–· 2 companies

3902. Zigzag Level Sum of Binary TreePremium

Solution68.7%Medium

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3907. Count Smaller Elements With Opposite ParityVideoPremium

Solution71.5%Medium

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3916. Number of ZigZag Arrays IIIPremium

–62.2%Hard

–

3929. Minimum Partition Score IIPremium

–43.5%Hard

–

3930. Power Update After K-th Largest Insertion IIPremium

Solution79.2%Hard

–

3935. Power Update After K-th Largest Insertion IPremium

Solution66.3%Medium

–· 1 company

3944. Minimum Operations to Make Array Modulo Alternating IIPremium

–64.5%Hard

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3949. Subtree Inversion Sum IIPremium

–67.6%Hard

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3958. Minimum Cost to Split into Ones IIVideoPremium

Solution69.2%Medium

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3967. Finish Time of Tasks IIPremium

–18.9%Hard

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3972. Valid Subarrays With Matching Sum Digits IIPremium

–25.6%Hard

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3973. Distinct Gate Paths to LCAPremium

–59.1%Hard

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3990. Create Grid With Exactly K Paths IIPremium

–65.3%Hard

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3991. Sort Array Using Prefix ReversalsPremium

Solution73.8%Medium

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4004. Minimum Moves to Balance Circular Array IIPremium

Solution60.7%Hard

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4005. Minimum Operations to Make Array Equal IIIPremium

–26.3%Hard

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4018. Total Sum of Interaction Cost in Tree Groups IIPremium

–67.5%Hard

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4019. Merge Close Characters IIVideoPremium

Solution78.7%Medium

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4028. Minimum Operations to Make a Rotated Palindrome IIPremium

Solution65.8%Hard

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4029. Elevator Requests IVVideoPremium

Solution58.3%Hard

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4042. Valid K-Unique Subarrays IIPremium

–68.5%Hard

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4047. Minimum Operations to Make XOR of All Elements ZeroPremium

–56.7%Hard

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4060. Count Evenly Good IntegersPremium

Solution77.8%Hard

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4069. Best Time to Buy and Sell Stock with Cooldown IIPremium

–58.0%Medium

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4082. Minimum Operations to Stabilize a Binary TreePremium

–62.9%Hard

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4087. Maximum Subarray Sum of Fixed Length After at Most K SwapsPremium

Solution66.2%Medium

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4096. Simulate Bomb Explosions and Falling BoxesPremium

–56.7%Medium

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