## Leetcode : Longest Valid Parentheses

Problem Statement Solution: Most of us must have encountered a similar problem of finding the maximum number of valid parentheses pairs, which is pretty straightforward and quite commonly asked in many programming interviews. This is one variant where we need to find the longest sub-string which is a valid parentheses. The sub-string may contain any number of parenthesis pairs. One naive approach is to check for all pair of indices […]