DIY: Valid Parentheses

Problem statement

For this problem, you are given a string that may be empty or may consist of opening and closing parentheses. Your task is to check that the string contains valid parenthesization or not.

Constraints

• 1 <= string.length <= $10^4$
• The string will only contain parentheses (), square brackets [], and braces {}.

Input

The function will take a string. Here is an example of the input:

input = "(){[{()}]}"

Output

The function will return true if the given string contains a properly matched sequence of brackets. Otherwise, it will return false. The following is the output of the input given above:

true

Coding exercise

For this coding exercise, you need to implement the is_valid(string) function, wherein the string will either be empty or a set of parentheses.