Solution: Longest Valid Parentheses
Explore how to use the stack pattern to identify the longest valid substring of parentheses. This lesson guides you through tracking indexes and matching pairs to efficiently solve parentheses matching problems in linear time.
We'll cover the following...
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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