1Alternating Groups IIMediumArraySliding Window
Solve → 2Reverse PairsHardArrayBinary SearchDivide and Conquer
Solve → 3Alternating Groups IIMediumArraySliding Window
Solve → 5Top K Frequent ElementsMediumArrayHash TableDivide and Conquer
Solve → 6Reverse PairsHardArrayBinary SearchDivide and Conquer
Solve → 73SumMediumArrayTwo PointersSorting
Solve → 8Merge IntervalsMediumArraySorting
Solve → 9Alternating Groups IIMediumArraySliding Window
Solve → 10Spiral MatrixMediumArrayMatrixSimulation
Solve → 11Open the LockMediumArrayHash TableString
Solve → 12Number of IslandsMediumArrayDepth-First SearchBreadth-First Search
Solve → 13Remove One Element to Make the Array Strictly IncreasingEasyArray
Solve → 14Set Matrix ZeroesMediumArrayHash TableMatrix
Solve → 15Matchsticks to SquareMediumArrayDynamic ProgrammingBacktracking
Solve → 16Group AnagramsMediumArrayHash TableString
Solve → 17Rotting OrangesMediumArrayBreadth-First SearchMatrix
Solve → 18Two SumEasyArrayHash Table
Solve → 19Sort Array By ParityEasyArrayTwo PointersSorting
Solve → 20Longest Continuous Subarray With Absolute Diff Less Than or Equal to LimitMediumArrayQueueSliding Window
Solve → 21Partition Equal Subset SumMediumArrayDynamic Programming
Solve → 22Reconstruct ItineraryHardArrayStringDepth-First Search
Solve → 23Minimize Maximum Pair Sum in ArrayMediumArrayTwo PointersGreedy
Solve → 24Concatenated WordsHardArrayStringDynamic Programming
Solve → 25Nearest Exit from Entrance in MazeMediumArrayBreadth-First SearchMatrix
Solve → 26Kth Largest Element in an ArrayMediumArrayDivide and ConquerSorting
Solve → 27Find Peak ElementMediumArrayBinary Search
Solve → 28Sort ColorsMediumArrayTwo PointersSorting
Solve → 29Shortest Unsorted Continuous SubarrayMediumArrayTwo PointersStack
Solve → 30Walls and GatesMediumArrayBreadth-First SearchMatrix
Solve → 31Word SearchMediumArrayStringBacktracking
Solve → 32Design a Stack With Increment OperationMediumArrayStackDesign
Solve → 33Best Time to Buy and Sell Stock IIMediumArrayDynamic ProgrammingGreedy
Solve → 34Merge IntervalsMediumArraySorting
Solve → 35Top K Frequent WordsMediumArrayHash TableString
Solve → 36Top K Frequent ElementsMediumArrayHash TableDivide and Conquer
Solve → 37Maximal SquareMediumArrayDynamic ProgrammingMatrix
Solve → 38Jump Game IIMediumArrayDynamic ProgrammingGreedy
Solve → 39Restore the Array From Adjacent PairsMediumArrayHash TableDepth-First Search
Solve → 40Remove One Element to Make the Array Strictly IncreasingEasyArray
Solve → 41Partition Equal Subset SumMediumArrayDynamic Programming
Solve → 42Minimize Maximum Pair Sum in ArrayMediumArrayTwo PointersGreedy
Solve → 43Two SumEasyArrayHash Table
Solve → 44Spiral MatrixMediumArrayMatrixSimulation
Solve → 45Number of IslandsMediumArrayDepth-First SearchBreadth-First Search
Solve → 46Open the LockMediumArrayHash TableString
Solve → 47Top K Frequent ElementsMediumArrayHash TableDivide and Conquer
Solve → 48Set Matrix ZeroesMediumArrayHash TableMatrix
Solve → 49Group AnagramsMediumArrayHash TableString
Solve → 50Matchsticks to SquareMediumArrayDynamic ProgrammingBacktracking
Solve → 51Sort Array By ParityEasyArrayTwo PointersSorting
Solve → 52Merge IntervalsMediumArraySorting
Solve → 53Reverse PairsHardArrayBinary SearchDivide and Conquer
Solve → 54Kth Largest Element in an ArrayMediumArrayDivide and ConquerSorting
Solve → 55Reconstruct ItineraryHardArrayStringDepth-First Search
Solve → 56Rotting OrangesMediumArrayBreadth-First SearchMatrix
Solve → 57Sort ColorsMediumArrayTwo PointersSorting
Solve → 58Shortest Unsorted Continuous SubarrayMediumArrayTwo PointersStack
Solve → 59Maximal SquareMediumArrayDynamic ProgrammingMatrix
Solve → 60Jump Game IIMediumArrayDynamic ProgrammingGreedy
Solve → 61Restore the Array From Adjacent PairsMediumArrayHash TableDepth-First Search
Solve → 62Word SearchMediumArrayStringBacktracking
Solve → 633SumMediumArrayTwo PointersSorting
Solve → 64Best Time to Buy and Sell Stock IIMediumArrayDynamic ProgrammingGreedy
Solve → 65Design a Stack With Increment OperationMediumArrayStackDesign
Solve → 66Longest Continuous Subarray With Absolute Diff Less Than or Equal to LimitMediumArrayQueueSliding Window
Solve → 67Concatenated WordsHardArrayStringDynamic Programming
Solve → 68Nearest Exit from Entrance in MazeMediumArrayBreadth-First SearchMatrix
Solve → 69Find Peak ElementMediumArrayBinary Search
Solve → 70Walls and GatesMediumArrayBreadth-First SearchMatrix
Solve → 71Top K Frequent WordsMediumArrayHash TableString
Solve → 72Sudoku SolverHardArrayHash TableBacktracking
Solve → 73Product of Array Except SelfMediumArrayPrefix Sum
Solve → 74Block Placement QueriesHardArrayBinary SearchBinary Indexed Tree
Solve → 75Alternating Groups IIMediumArraySliding Window
Solve → 76Alien DictionaryHardArrayStringDepth-First Search
Solve →