题目链接:https://leetcode.com/problems/implement-queue-using-stacks/ 题目:Implement the following operations of a queue using stacks. push(x) -- Push element x to the back of queue. pop() -- Removes the element from in front of queue. peek() -- Get the fro…

题目 Implement the following operations of a queue using stacks. push(x) – Push element x to the back of queue. pop() – Removes the element from in front of queue. peek() – Get the front element. empty() – Return whether the queue is empty. Notes: You…

232 - Implement Queue using Stacks Implement the following operations of a queue using stacks. push(x) -- Push element x to the back of queue. pop() -- Removes the element from in front of queue. peek() -- Get the front element. empty() -- Return whe…

 Implement the following operations of a queue using stacks. push(x) -- Push element x to the back of queue. pop() -- Removes the element from in front of queue. peek() -- Get the front element. empty() -- Return whether the queue is empty. Notes:…

Implement the following operations of a queue using stacks. push(x) -- Push element x to the back of queue. pop() -- Removes the element from in front of queue. peek() -- Get the front element. empty() -- Return whether the queue is empty. Notes: You…

class Queue { public: // Push element x to the back of queue. void push(int x) { while (!nums.empty()) { nums_assist.push(nums.top()); nums.pop(); } nums.push(x); while (!nums_assist.empty()) { nums.push(nums_assist.top()); nums_assist.pop(); } } //…

题目链接:https://leetcode.com/problems/single-number/ 题目:Given an array of integers, every element appears twice except for one. Find that single one. Note: Your algorithm should have a linear runtime complexity. Could you implement it without using extr…

题目链接:https://leetcode.com/problems/missing-number/ 题目:Given an array containing n distinct numbers taken from 0, 1, 2, ..., n, find the one that is missing from the array. For example, Given nums = [0, 1, 3] return 2. Note: Your algorithm should run…

1.题目描述 2.思路 思路简单,这里用一个图来举例说明: 3.java代码 public class MyQueue { Stack<Integer> stack1=new Stack<Integer>(); Stack<Integer> stack2=new Stack<Integer>(); /** Push element x to the back of queue. */ public void push(int x) { stack1.push…

题目链接:https://leetcode.com/problems/3sum-closest/ 题目:Given an array S of n integers, find three integers in S such that the sum is closest to a given number, target. Return the sum of the three integers. You may assume that each input would have exact…