Given a string `s` containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid. Intuition: To determine if a string of parentheses is valid, we can utilize a ...

Given a string s of '(' , ')' and lowercase English characters. Your task is to remove the minimum number of parentheses ( '(' or ')', in any positions ) so that the resulting parentheses string is ...