1Insert Delete GetRandom O(1)MediumArrayHash TableMath
Solve → 2Construct Target Array With Multiple SumsHardArrayHeap (Priority Queue)
Solve → 3Subarray Sum Equals KMediumArrayHash TablePrefix Sum
Solve → 4Insert Delete GetRandom O(1)MediumArrayHash TableMath
Solve → 5Text JustificationHardArrayStringSimulation
Solve → 6Longest Common PrefixEasyArrayStringTrie
Solve → 7Sort the Matrix DiagonallyMediumArraySortingMatrix
Solve → 8Get Biggest Three Rhombus Sums in a GridMediumArrayMathSorting
Solve → 9Finding Pairs With a Certain SumMediumArrayHash TableDesign
Solve → 101-bit and 2-bit CharactersEasyArray
Solve → 11Range Frequency QueriesMediumArrayHash TableBinary Search
Solve → 12Find Numbers with Even Number of DigitsEasyArrayMath
Solve → 133Sum With MultiplicityMediumArrayHash TableTwo Pointers
Solve → 14Construct Target Array With Multiple SumsHardArrayHeap (Priority Queue)
Solve → 15Range Frequency QueriesMediumArrayHash TableBinary Search
Solve → 161-bit and 2-bit CharactersEasyArray
Solve → 17Sort the Matrix DiagonallyMediumArraySortingMatrix
Solve → 18Find Numbers with Even Number of DigitsEasyArrayMath
Solve → 193Sum With MultiplicityMediumArrayHash TableTwo Pointers
Solve → 20Get Biggest Three Rhombus Sums in a GridMediumArrayMathSorting
Solve → 21Finding Pairs With a Certain SumMediumArrayHash TableDesign
Solve → 22Insert Delete GetRandom O(1)MediumArrayHash TableMath
Solve → 23Text JustificationHardArrayStringSimulation
Solve → 24Subarray Sum Equals KMediumArrayHash TablePrefix Sum
Solve → 25Longest Common PrefixEasyArrayStringTrie
Solve →