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Grokking the Coding Interview Patterns in Go

Solution: Minimum Remove to Make Valid Parentheses

Understand how to use a stack to remove the minimum number of invalid parentheses in a string. This lesson helps you apply Last In First Out operations to identify unmatched parentheses and achieve valid parenthesization, improving your ability to solve related coding interview problems.

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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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