1Insert Delete GetRandom O(1)MediumArrayHash TableMath
Solve → 2Shortest Uncommon Substring in an ArrayMediumArrayHash TableString
Solve → 3Group AnagramsMediumArrayHash TableString
Solve → 4Insert Delete GetRandom O(1) - Duplicates allowedHardArrayHash TableMath
Solve → 5Design Hit CounterMediumArrayBinary SearchDesign
Solve → 6Coin ChangeMediumArrayDynamic ProgrammingBreadth-First Search
Solve → 7Optimal Account BalancingHardArrayDynamic ProgrammingBacktracking
Solve → 8Insert Delete GetRandom O(1)MediumArrayHash TableMath
Solve → 9Shortest Uncommon Substring in an ArrayMediumArrayHash TableString
Solve → 10Group AnagramsMediumArrayHash TableString
Solve → 11Insert Delete GetRandom O(1) - Duplicates allowedHardArrayHash TableMath
Solve → 12Design Hit CounterMediumArrayBinary SearchDesign
Solve → 13Coin ChangeMediumArrayDynamic ProgrammingBreadth-First Search
Solve → 14Optimal Account BalancingHardArrayDynamic ProgrammingBacktracking
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