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Grokking the Coding Interview Patterns

Solution: Minimum Remove to Make Valid Parentheses

Explore how to use stack methods to identify and remove unmatched parentheses in a string. Learn to traverse strings efficiently while tracking indices to ensure valid parentheses configuration, achieving optimal time and space complexity for this common coding interview problem.

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Statement

Given a string, s, that may have matchedEach opening parenthesis, (, has a closing parenthesis, ), for it. and unmatchedThere is no corresponding closing parenthesis, ), for an opening parenthesis, (. parentheses, remove the minimum number of parentheses so that the resulting string represents a valid parenthesization. For example, the string “a(b)” represents a valid parenthesization while the string “a(b” doesn’t, since the opening parenthesis doesn’t have any corresponding closing parenthesis.

Constraints:

  • 1≤1 \leq s.length
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