}/** Push element x to the back of queue. */publicvoidpush(intx){if(inStack.empty()) { front = x; } inStack.push(x); }/** Removes the element from in front of queue and returns that element. */publicintpop(){if(empty()) {thrownewIllegalArgumentException("[ERROR] The queue ...
LeetCode | 232 Implement Queue Using Stacks 分析 peek:In computer science, peek is an operation on certain abstract data types, specifically sequential collections such as stacks and queues, which returns the value of thetop("front")of the collectionwithout removing the element from the collection...
1 读题 LeetCode 232E 用栈实现队列 Implement Queue using Stacks 2 Python 解题 正如咱们前面那个问题,list 既可以实现栈,还能实现列表,所以咱这题的代码,和那个队列模拟栈的就很类似了。 ## LeetCode 232## Impletement Queue using StackclassMyQueue:def__init__(self):self.l1=[]## stack 1 = l1se...
public class MyQueue { Stack<Integer> s1; Stack<Integer> s2; public MyQueue() { s1 = new Stack(); s2 = new Stack(); } /** Push element x to the back of queue. */ public void push(int x) { s1.push(x); } /** Removes the element from in front of queue and returns that...
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. ...
/* * @lc app=leetcode id=232 lang=javascript * * [232] Implement Queue using Stacks *//** * Initialize your data structure here. */var MyQueue = function () { // tag: queue stack array this.stack = []; this.helperStack = [];};/** * Push element x to the back of ...
建议和这道题leetcode 232. Implement Queue using Stacks 双栈实现队列 一起学习。 1)取栈顶元素: 返回有元素的队列的首元素 2)判栈空:若队列a和b均为空则栈空 3)入栈:a队列当前有元素,b为空(倒过来也一样)则将需要入栈的元素先放b中,然后将a中的元素依次出列并入列倒b中。(保证有一个队列是空的...
leetcode225 implement stack using queues 题目要求 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....
shiftStack();if(!_old.empty())return_old.top();return0; }//Return whether the queue is empty.boolempty(void) {return_old.empty() &&_new.empty(); }private: stack<int>_old, _new; }; 用栈来实现队列[LeetCode] Implement Queue using Stacks,如需转载请自行联系原博主。
A classic interview question. This link has a nice explanation of the idea using two stacks and its amortized time complexity.