剑指offer-题21：包含min函数的栈

男娘i 2022-05-29 05:50 277阅读 0赞

## **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。

实验平台：[牛客网][Link 1]

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## **解决思路：** ##

![这里写图片描述][Image 1]  
![这里写图片描述][Image 1]  
![这里写图片描述][Image 1]

java:

import java.util.Stack;
    
    public class Solution {
        Stack<Integer> minStack = new Stack<>();
        Stack<Integer> dataStack = new Stack<>();
    
        public void push(int node) {
            this.dataStack.push(node);
            if (minStack.isEmpty() || node < minStack.peek()) {
                minStack.push(node);
            } else {
                minStack.push(minStack.peek());
            }
        }
    
        public void pop() {
            if (!dataStack.isEmpty()) {
                dataStack.pop();
                minStack.pop();
            }
        }
    
        public int top() {
            return dataStack.peek();
        }
    
        public int min() {
            return minStack.peek();
        }
    }

python:

# -*- coding:utf-8 -*-
    class Solution:
        data_stack = []
        min_stack = []
    
        def push(self, node):
            self.data_stack.append(node)
            if len(self.min_stack) == 0 or node < self.min_stack[-1]:
                self.min_stack.append(node)
            else:
                self.min_stack.append(self.min_stack[-1])
    
        def pop(self):
            if len(self.data_stack) > 0:
                self.data_stack.pop()
                self.min_stack.pop()
    
        def top(self):
            return self.data_stack[-1]
    
        def min(self):
            return self.min_stack[-1]

[Link 1]: https://www.nowcoder.com/ta/coding-interviews?page=1
[Image 1]: