362. Simple Stack Bracket Balance Check

Given a string s containing only 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.

Example 1: Input: s = "()[]{}" Output: true
Example 2: Input: s = "([)]" Output: false

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