Solution: Longest Valid Parentheses
Explore how to determine the longest valid parentheses substring using the stack data structure. This lesson guides you through implementing an algorithm that tracks indexes to identify well-formed segments efficiently. By the end, you'll understand the time and space complexities of this stack pattern solution.
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.
...