문제
Given a string s containing just the characters ‘(‘, ‘)’, ‘{‘, ‘}’, ‘[’ and ‘]’, determine if the input string is valid.
An input string is valid if:
Open brackets must be closed by the same type of brackets. Open brackets must be closed in the correct order.
Example 1:
Input: s = “()” Output: true
Example 2:
Input: s = “()[]{}” Output: true
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