Solution: Longest Valid Parentheses
Explore how to use the stack pattern to solve the longest valid parentheses substring problem. Understand how to track indices of unmatched parentheses to calculate valid segment lengths efficiently in linear time.
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We'll cover the following...
Statement
You are given a string composed entirely of ‘(’ and ‘)’ characters. Your goal is to identify the longest contiguous segment (substring) within this string that represents a “well-formed” or “valid” sequence of parentheses.
A substring is considered valid if:
Every opening parenthesis ‘
(’ has a corresponding closing parenthesis ‘)’.The pairs of parentheses are correctly nested.
Return the length of this longest valid substring.
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