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Grokking the Coding Interview Patterns in C#

Remove Invalid Parentheses

Explore how to use backtracking to remove invalid parentheses from a string while ensuring minimal removals. Learn to generate all valid string combinations by assessing parentheses validity and applying efficient search strategies.

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Statement

You are given a string, s, that contains:

  • Lowercase English letters

  • Opening '(' and closing ')' parentheses

A string is considered valid if:

  1. All opening parentheses '(' are closed properly by a matching ')'.

  2. The parentheses are in ...