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notes/30. 包含 min 函数的栈.md
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## 题目链接
[牛客网](https://www.nowcoder.com/practice/4c776177d2c04c2494f2555c9fcc1e49?tpId=13&tqId=11173&tPage=1&rp=1&ru=/ta/coding-interviews&qru=/ta/coding-interviews/question-ranking&from=cyc_github)
[牛客网](https://www.nowcoder.com/practice/4c776177d2c04c2494f2555c9fcc1e49?tpId=13\&tqId=11173\&tPage=1\&rp=1\&ru=/ta/coding-interviews\&qru=/ta/coding-interviews/question-ranking\&from=cyc\_github)
## 题目描述
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使用一个额外的 minStack，栈顶元素为当前栈中最小的值。在对栈进行 push 入栈和 pop 出栈操作时，同样需要对 minStack 进行入栈出栈操作，从而使 minStack 栈顶元素一直为当前栈中最小的值。在进行 push 操作时，需要比较入栈元素和当前栈中最小值，将值较小的元素 push 到 minStack 中。
<div align="center"> <img src="https://cs-notes-1256109796.cos.ap-guangzhou.myqcloud.com/image-20201104013936126.png" width="350px"> </div><br>
![](https://cs-notes-1256109796.cos.ap-guangzhou.myqcloud.com/image-20201104013936126.png)\
```java
private Stack<Integer> dataStack = new Stack<>();