A common programming problem is to determine whether a string of parentheses is valid. This is often referred to as the "valid parentheses" problem. In this problem, you are given a string of parentheses and your task is to determine whether the string is a valid combination of parentheses. A valid combination of parentheses consists of a series of open and close parentheses, where each open parenthesis has a corresponding close parenthesis that comes after it. The input may contain any combination of round, square or curly braces.
The problem can be approached using stack data structure. Where we can store the opening parenthesis on the stack as we encounter them and when closing parenthesis is encountered we check if the top of the stack is a corresponding opening parenthesis or not.
Given a string s containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid.
An input string is valid if:
Open brackets must be closed by the same type of brackets.
Open brackets must be closed in the correct order.
Example 1:
Input: s = "()"
Output: true
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