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Problem: Minimum Remove to Make Valid Parentheses

Medium
30 min
Understand how to solve problems involving invalid parentheses by removing the fewest characters to achieve valid strings. This lesson guides you to apply stack data structures to efficiently validate and manipulate parentheses in strings, enhancing your coding interview preparation.

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
Understand how to solve problems involving invalid parentheses by removing the fewest characters to achieve valid strings. This lesson guides you to apply stack data structures to efficiently validate and manipulate parentheses in strings, enhancing your coding interview preparation.

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.