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Solution: Minimum Remove to Make Valid Parentheses

Explore how to use stacks to remove invalid parentheses from a string, ensuring valid parenthesization. Learn the step-by-step approach, time and space complexity, and practice solving these coding interview pattern problems effectively.

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:

  • 11 \leq s.length 103\leq 10^3
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