1Longest Valid ParenthesesHardStringDynamic ProgrammingStack
Solve → 2Generate ParenthesesMediumStringDynamic ProgrammingBacktracking
Solve → 3Generate ParenthesesMediumStringDynamic ProgrammingBacktracking
Solve → 4Regular Expression MatchingHardStringDynamic ProgrammingRecursion
Solve → 5Edit DistanceMediumStringDynamic Programming
Solve → 6Longest Valid ParenthesesHardStringDynamic ProgrammingStack
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