40 lines
934 B
Java
40 lines
934 B
Java
# 30. 包含 min 函数的栈
|
||
|
||
[NowCoder](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
|
||
|
||
定义栈的数据结构，请在该类型中实现一个能够得到栈最小元素的 min 函数。
|
||
|
||
## 解题思路
|
||
|
||
```java
|
||
private Stack<Integer> dataStack = new Stack<>();
|
||
private Stack<Integer> minStack = new Stack<>();
|
||
|
||
public void push(int node) {
|
||
dataStack.push(node);
|
||
minStack.push(minStack.isEmpty() ? node : Math.min(minStack.peek(), node));
|
||
}
|
||
|
||
public void pop() {
|
||
dataStack.pop();
|
||
minStack.pop();
|
||
}
|
||
|
||
public int top() {
|
||
return dataStack.peek();
|
||
}
|
||
|
||
public int min() {
|
||
return minStack.peek();
|
||
}
|
||
```
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<div align="center"><img width="320px" src="https://cs-notes-1256109796.cos.ap-guangzhou.myqcloud.com/githubio/公众号二维码-2.png"></img></div>
|