1Count the Hidden SequencesMediumArrayPrefix Sum
Solve → 2First Missing PositiveHardArrayHash Table
Solve → 3Maximum Spending After Buying ItemsHardArrayGreedySorting
Solve → 4Bitwise OR of All Subsequence SumsMediumArrayMathBit Manipulation
Solve → 5Split the Array to Make Coprime ProductsHardArrayHash TableMath
Solve → 6Number of IslandsMediumArrayDepth-First SearchBreadth-First Search
Solve → 73SumMediumArrayTwo PointersSorting
Solve → 8Snakes and LaddersMediumArrayBreadth-First SearchMatrix
Solve → 9Move ZeroesEasyArrayTwo Pointers
Solve → 10Single Element in a Sorted ArrayMediumArrayBinary Search
Solve → 11Single Number IIIMediumArrayBit Manipulation
Solve → 12Maximal SquareMediumArrayDynamic ProgrammingMatrix
Solve → 13Maximum SubarrayMediumArrayDivide and ConquerDynamic Programming
Solve → 14The Skyline ProblemHardArrayDivide and ConquerBinary Indexed Tree
Solve → 15PermutationsMediumArrayBacktracking
Solve → 16Merge IntervalsMediumArraySorting
Solve → 17Container With Most WaterMediumArrayTwo PointersGreedy
Solve → 18Maximum Spending After Buying ItemsHardArrayGreedySorting
Solve → 19Split the Array to Make Coprime ProductsHardArrayHash TableMath
Solve → 20Bitwise OR of All Subsequence SumsMediumArrayMathBit Manipulation
Solve → 21Count the Hidden SequencesMediumArrayPrefix Sum
Solve → 22First Missing PositiveHardArrayHash Table
Solve → 23Number of IslandsMediumArrayDepth-First SearchBreadth-First Search
Solve → 24Maximum SubarrayMediumArrayDivide and ConquerDynamic Programming
Solve → 253SumMediumArrayTwo PointersSorting
Solve → 26Snakes and LaddersMediumArrayBreadth-First SearchMatrix
Solve → 27Single Number IIIMediumArrayBit Manipulation
Solve → 28Maximal SquareMediumArrayDynamic ProgrammingMatrix
Solve → 29Single Element in a Sorted ArrayMediumArrayBinary Search
Solve → 30The Skyline ProblemHardArrayDivide and ConquerBinary Indexed Tree
Solve → 31PermutationsMediumArrayBacktracking
Solve → 32Move ZeroesEasyArrayTwo Pointers
Solve → 33Combination SumMediumArrayBacktracking
Solve → 34Search a 2D Matrix IIMediumArrayBinary SearchDivide and Conquer
Solve → 35Merge IntervalsMediumArraySorting
Solve → 36Container With Most WaterMediumArrayTwo PointersGreedy
Solve →