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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.
» Solve this problem
A very easy problem. Push the char we read in a new string and compare.
Code更新了，这里不需要用一个str去存，直接比较就行了，节省了空间和时间。
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