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Problem: Minimum Remove to Make Valid Parentheses

Medium
30 min
Explore techniques using stacks to remove the minimal number of unmatched parentheses from a string. Learn how to ensure valid parenthesis structure by identifying and deleting only the necessary characters, sharpening your skills in string manipulation and stack usage.

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
  • s[i] is either an opening parenthesis (( , a closing parenthesiss )), or a lowercase English letter.
Problem
Ask
Submissions

Problem: Minimum Remove to Make Valid Parentheses

Medium
30 min
Explore techniques using stacks to remove the minimal number of unmatched parentheses from a string. Learn how to ensure valid parenthesis structure by identifying and deleting only the necessary characters, sharpening your skills in string manipulation and stack usage.

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
  • s[i] is either an opening parenthesis (( , a closing parenthesiss )), or a lowercase English letter.