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Grokking the Coding Interview Patterns

Solution: Minimum Remove to Make Valid Parentheses

Understand how to apply stack data structures to remove invalid parentheses from a string for valid parenthesization. Learn to identify unmatched parentheses, use stacks with LIFO logic, and implement an O(n) time complexity solution. This lesson equips you with the skills to handle such problems during coding interviews effectively.

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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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