Valid Parentheses

STRING
STACK

Problem

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

  1. Open brackets must be closed by the same type of brackets.
  2. Open brackets must be closed in the correct order.

Examples

validParentheses("{[()]}")
// true

validParentheses("{[(])}")
// false
validParentheses("({})[({})]")
// true
validParentheses("({})[({)}]")
// false
validParentheses("({[})")
// false
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