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in 栈用来处理入栈(push)操作,out 栈用来处理出栈(pop)操作。一个元素进入 in 栈之后,出栈的顺序被反转。当元素要出栈时,需要先进入 out 栈,此时元素出栈顺序再一次被反转,因此出栈顺序就和最开始入栈顺序是相同的,先进入的元素先退出,这就是队列的顺序。
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<div align="center"> <img src="pics/3ea280b5-be7d-471b-ac76-ff020384357c.gif" width="450"/> </div><br>
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<div align="center"> <img src="https://cs-notes-1256109796.cos.ap-guangzhou.myqcloud.com/3ea280b5-be7d-471b-ac76-ff020384357c.gif" width="450"/> </div><br>
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```java
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Stack<Integer> in = new Stack<Integer>();
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