# Problem Definition

## Description

Given a string containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid.

The brackets must close in the correct order, "()" and "()[]{}" are all valid but "(]" and "([)]" are not.

Return 0 / 1 ( 0 for false, 1 for true ) for this problem

## Notes

1. [CodeSchool video](https://www.youtube.com/watch?v=QZOLb0xHB_Q)
1. [Clark Feusier blog](http://clarkfeusier.com/2015/01/16/interview-question-balanced-parentheses-stack.html)