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Grokking the Coding Interview Patterns in C#

Solution: Minimum Remove to Make Valid Parentheses

Understand how to apply stack operations to identify and remove invalid parentheses in a string. This lesson teaches how to use a last-in, first-out method to validate parenthesis sequences efficiently and ensures you can implement a solution with linear time complexity.

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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 ≤103\leq 10^3
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