updaye 0232.用栈实现队列:添加复杂度分析
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@ -112,6 +112,10 @@ public:
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```
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* 时间复杂度: push和empty为O(1), pop和peek为O(n)
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* 空间复杂度: O(n)
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## 拓展
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可以看出peek()的实现,直接复用了pop(), 要不然,对stOut判空的逻辑又要重写一遍。
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