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# slt

不管哪种方法，如果 长度是奇数，直接返回false

## 思路1 stack 直接把当前左括号对应的右括号入栈

注意括号交错要返回False

一种映射方法是只把右括号push入栈

## 思路2 stack 把左括号入栈，遇到对应的右括号则弹出

* 时间复杂度 O(n)
* 空间复杂度 O(n)

这是最容易想到的方法


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