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Grokking the Coding Interview Patterns in C++

Solution: Minimum Remove to Make Valid Parentheses

Understand how to apply stack data structures to identify and remove unmatched parentheses from a string, ensuring valid parentheses formation. Explore step-by-step traversal techniques and use indices to efficiently eliminate invalid characters.

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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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