Balanced Parentheses String Validation

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Your question is Balanced Parentheses String Validation. Start with the requirements on the right.

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Problem

Given a string s containing only the characters (, ), {, }, [ and ], return true if the string is balanced and false otherwise. A string is balanced if every opening bracket has a matching closing bracket of the same type and the pairs are properly nested.

Constraints

1 <= len(s) <= 10^5
s contains only the characters (, ), {, }, [ and ]
A valid solution should run in O(n) time

Function Signature

def is_balanced(s):

Your solutionPython 3

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