Solution: Longest Valid Parentheses
Discover how to identify the longest well-formed parentheses substring by applying the stack pattern. This lesson teaches you to track indexes for matching pairs and calculate substring lengths efficiently using a single pass through the string.
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.
Constraints:
s.length...