题解 | #用两个栈实现队列#
用两个栈实现队列
https://www.nowcoder.com/practice/54275ddae22f475981afa2244dd448c6
import java.util.Stack; public class Solution { Stack<Integer> stack1 = new Stack<Integer>(); Stack<Integer> stack2 = new Stack<Integer>(); public void push(int node) { stack1.push(node); } public int pop() { while (stack1.size() != 0){ stack2.push(stack1.pop()); } int res = stack2.pop(); while (stack2.size() != 0){ stack1.push(stack2.pop()); } return res; } }