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Grokking the Coding Interview Patterns in Python

Solution: Minimum Remove to Make Valid Parentheses

Explore how to apply stack data structures to solve the problem of invalid parentheses in a string. Learn to identify unmatched parentheses and remove them with an efficient O(n) time algorithm. This lesson helps you build skills in string manipulation and stack operations to ensure valid balanced parentheses in coding interview questions.

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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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