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docs/notes/9. 用两个栈实现队列.md
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@ -12,7 +12,7 @@
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。
<div align="center"> <img src="https://cs-notes-1256109796.cos.ap-guangzhou.myqcloud.com/3ea280b5-be7d-471b-ac76-ff020384357c.gif" width="400"/> </div><br>
<div align="center"> <img src="https://cs-notes-1256109796.cos.ap-guangzhou.myqcloud.com/3ea280b5-be7d-471b-ac76-ff020384357c.gif" width="450"/> </div><br>
```java
Stack<Integer> in = new Stack<Integer>();