Implement a last-in-first-out (LIFO) stack using only two queues. The implemented stack should support all the functions of a normal stack (push,top,pop, andempty). Implement theMyStackclass: void push(int x)Pushes element x to the top of the stack. int pop()Removes the element on t...
## LeetCode 232classMyQueue:def__init__(self):self.l1=[]## queue1 = l1self.l2=[]## queue2 = l2defpush(self,x:int)->None:## Push x onto stackself.l1.append(x)## The right of the list = the top of the stack = the back of the queuedefpop(self)->int:## pop 抽取## ...
importjava.util.NoSuchElementException;importjava.util.LinkedList;importjava.util.Queue;classMyStack{/** * The main queue using to store all the elements in the stack */privateQueue<Integer> q1;/** * The auxiliary queue using to implement `pop` operation */privateQueue<Integer> q2;/** * ...
You may assume that all operations are valid (for example, no pop or top operations will be called on an empty stack). 要求使用双队列实现一个栈的所有的功能,是一个很经典的问题,需要记住学习。 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: ...
Implement the following operations of a stack using queues. push(x) -- Push element x onto stack. pop() -- Removes the element on top of the stack. top() -- Get the top element. empty() -- Return whether the stack is empty. ...
LeetCode 225 Implement Stack using Queues 用队列实现栈,1、两个队列实现,始终保持一个队列为空即可2、一个队列实现栈
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. ...
LeetCode 225. Implement Stack using Queues 简介:使用队列实现栈的下列操作:push(x) -- 元素 x 入栈;pop() -- 移除栈顶元素;top() -- 获取栈顶元素;empty() -- 返回栈是否为空 Description Implement the following operations of a stack using queues....
# Implement the following operations of a stack using queues. # # push(x) -- Push element x onto stack. # pop() -- Removes the element on top of the stack. # top() -- Get the top element. # empty() -- Return whether the stack is empty. # Notes: # You must use only ...
用两个栈实现队列:https://leetcode.cn/problems/implement-queue-using-stacks/submissions/564009874/ 🌉stack的模拟实现 从栈的接口中可以看出,栈实际是一种特殊的vector,因此使用vector完全可以模拟实现stack。 stack.c 代码语言:javascript 代码运行次数:0 ...