How to check Valid Parentheses: O(n) Stack solution explained
Problem overview We are given a string s containing only the characters '(', ')', '{', '}', '[', and ']'. We need to determine if the input string is valid or not. A string is valid if: Open brackets must be closed by the same type of bracket. Open brackets must be closed in the correct order. Every close bracket has a corresponding open bracket of the same type. Examples Valid ...