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103 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 · 103 results

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TitleSolutionAcceptDifficultyTopics

2791. Count Paths That Can Form a Palindrome in a TreeVideo

Solution52.6%Hard

Bit Manipulation, Bitmask +3· 4 companies

2835. Minimum Operations to Form Subsequence With Target SumVideo

Solution32.5%Hard

Array, Bit Manipulation +1· 1 company

2836. Maximize Value of Function in a Ball Passing GameVideo

Solution31.3%Hard

Array, Bit Manipulation +1· 1 company

2897. Apply Operations on Array to Maximize Sum of SquaresVideo

Solution73.9%Hard

Array, Bit Manipulation +2· 1 company

2920. Maximum Points After Collecting Coins From All NodesVideo

Solution36.6%Hard

Array, Bit Manipulation +3· 1 company

2935. Maximum Strong Pair XOR IIVideo

Solution32.9%Hard

Array, Bit Manipulation +3· 1 company

2959. Number of Possible Sets of Closing BranchesVideo

Solution51.2%Hard

Bit Manipulation, Enumeration +3· 3 companies

3003. Maximize the Number of Partitions After OperationsVideo

Solution53.5%Hard

Bit Manipulation, Bitmask +2· 1 company

3022. Minimize OR of Remaining Elements Using OperationsVideo

Solution30.2%Hard

Array, Bit Manipulation +1· 1 company

3068. Find the Maximum Sum of Node ValuesVideo

Solution69.5%Hard

Array, Bit Manipulation +4· 4 companies

3108. Minimum Cost Walk in Weighted GraphVideo

Solution68.3%Hard

Array, Bit Manipulation +2· 6 companies

3116. Kth Smallest Amount With Single Denomination CombinationVideo

Solution50.3%Hard

Array, Binary Search +4

3117. Minimum Sum of Values by Dividing ArrayVideo

Solution28.5%Hard

Array, Binary Search +4· 1 company

3141. Maximum Hamming DistancesVideoPremium

Solution50.0%Hard

Array, Bit Manipulation +1

3145. Find Products of Elements of Big ArrayVideo

Solution25.0%Hard

Array, Binary Search +1· 1 company

3149. Find the Minimum Cost Array PermutationVideo

Solution26.1%Hard

Array, Bit Manipulation +2· 1 company

3154. Find Number of Ways to Reach the K-th StairVideo

Solution38.2%Hard

Bit Manipulation, Combinatorics +3· 1 company

3171. Find Subarray With Bitwise OR Closest to KVideo

Solution31.5%Hard

Array, Binary Search +2· 1 company

3181. Maximum Total Reward Using Operations IIVideo

Solution21.9%Hard

Array, Bit Manipulation +1· 1 company

3209. Number of Subarrays With AND Value of KVideo

Solution35.7%Hard

Array, Binary Search +2· 1 company

3276. Select Cells in Grid With Maximum ScoreVideo

Solution15.7%Hard

Array, Bit Manipulation +3

3283. Maximum Number of Moves to Kill All PawnsVideo

Solution33.7%Hard

Array, Bit Manipulation +4· 1 company

3287. Find the Maximum Sequence Value of ArrayVideo

Solution21.9%Hard

Array, Bit Manipulation +1· 1 company

3307. Find the K-th Character in String Game IIVideo

Solution48.5%Hard

Bit Manipulation, Math +1· 3 companies

3435. Frequencies of Shortest SupersequencesVideo

–22.2%Hard

Array, Bit Manipulation +4· 1 company

3444. Minimum Increments for Target Multiples in an ArrayVideo

–27.5%Hard

Array, Bit Manipulation +4

3495. Minimum Operations to Make Array Elements ZeroVideo

Solution60.4%Hard

Array, Bit Manipulation +1· 4 companies

3530. Maximum Profit from Valid Topological Order in DAGVideo

–29.7%Hard

Array, Bit Manipulation +4

3533. Concatenated DivisibilityVideo

–30.6%Hard

Array, Bit Manipulation +2· 1 company

3534. Path Existence Queries in a Graph IIVideo

Solution64.2%Hard

Array, Binary Search +6· 4 companies

3539. Find Sum of Array Product of Magical SequencesVideo

Solution61.9%Hard

Array, Bit Manipulation +4· 2 companies

3553. Minimum Weighted Subgraph With the Required Paths IIVideo

–48.2%Hard

Array, Bit Manipulation +3

3559. Number of Ways to Assign Edge Weights IIVideo

Solution71.8%Hard

Array, Bit Manipulation +4· 3 companies

3575. Maximum Good Subtree ScoreVideo

–44.0%Hard

Array, Bit Manipulation +4· 1 company

3585. Find Weighted Median Node in TreeVideo

Solution26.7%Hard

Array, Binary Search +4· 1 company

3594. Minimum Time to Transport All IndividualsVideo

–28.3%Hard

Array, Bit Manipulation +4

3615. Longest Palindromic Path in GraphVideo

–22.6%Hard

Bit Manipulation, Bitmask +3· 1 company

3621. Number of Integers With Popcount-Depth Equal to K IVideo

–23.0%Hard

Bit Manipulation, Combinatorics +2

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

3646. Next Special Palindrome NumberVideo

–28.0%Hard

Backtracking, Bit Manipulation· 1 company

3677. Count Binary Palindromic NumbersVideo

–33.2%Hard

Bit Manipulation, Math

3681. Maximum XOR of SubsequencesVideo

–49.5%Hard

Array, Bit Manipulation +2

3757. Number of Effective SubsequencesVideo

–30.4%Hard

Array, Bit Manipulation +3

3801. Minimum Cost to Merge Sorted ListsVideo

Solution33.8%Hard

Array, Binary Search +3

3806. Maximum Bitwise AND After Increment OperationsVideo

Solution31.8%Hard

Array, Bit Manipulation +2· 1 company

3821. Find Nth Smallest Integer With K One BitsVideo

Solution34.7%Hard

Bit Manipulation, Combinatorics +1· 1 company

3845. Maximum Subarray XOR with Bounded RangeVideo

Solution32.3%Hard

Array, Bit Manipulation +5

3878. Count Good SubarraysVideo

Solution26.2%Hard

Array, Bit Manipulation +2· 3 companies

3910. Count Connected Subgraphs with Even Node SumVideo

Solution59.0%Hard

Array, Bit Manipulation +5

Showing 51–100 of 103