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Grokking the Coding Interview Patterns in Python

Solution: Minimum Remove to Make Valid Parentheses

Explore how to use stack data structures to identify and remove unmatched parentheses in a string. This lesson helps you implement a linear-time solution that ensures the resulting string is validly parenthesized. Understand the stack operations and their role in solving this common string manipulation 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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