Grokking the Coding Interview: Patterns for Coding Questions
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Longest Valid Parentheses (hard)
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Problem Statement

You are given a string containing just the characters '(' and ')'. Your task is to find the length of the longest valid (well-formed) parentheses substring.

Example 1:

  • Input: "(())"
  • Expected Output: 4
  • Justification: The entire string is a valid parentheses substring.

Example 2:

  • Input: ")()())"
  • Expected Output: 4
  • Justification: The longest valid parentheses substring is "()()".

Example 3:

  • Input: "(()"
  • Expected Output: 2

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