Implement a first in first out (FIFO) queue using only two stacks. The implemented queue should support all the functions of a normal queue (push, peek, pop, and empty). Implement the MyQueue class: void push(int x) Pushes element x to the back of the queue. int pop() Removes the...
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...
* Initialize your data structure here. */function__construct(){$this->stack1 = [];$this->stack2 = []; }/** * Push element x to the back of queue. *@paramInteger $x *@returnNULL */functionpush($x){$this->stack1[] =$x; }/** * Removes the element from in front of queue...
二、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 whether the queue is empty. Notes:...
queue.empty(); // returns false 1. 2. 3. 4. 5. 6. 7. 思路是需要用到两个栈,用first和second表示。以下分别解释一下每个函数的实现方式。 push() - 将元素加入队列。这没什么可说的,加入到第一个栈first中。时间O(1) pop() - 弹出队列的首个元素。因为stack只会弹出最后一个放入的元素,所以只...
Implement a first in first out (FIFO) queue using only two stacks. The implemented queue should support all the functions of a normal queue (push,peek,pop, andempty). Implement theMyQueueclass: void push(int x)Pushes element x to the back of the queue. ...
queue:2->1->3--->queue:1->3->2--->queue:3->2->1... 这样不管什么时候出队顺序都和出栈的顺序相同,并且题目要求实现的所有方法可直接套用队列的方法。 Java: 方法一 代码语言:javascript 复制 classMyStack{Queue<Integer>queue1;Queue<Integer>queue2;privateint top;//指向栈顶元素publicMyStack(...
queue.empty(); //返回false 本次解题使用的开发工具是eclipse,jdk使用的版本是1.8,环境是win7 64位系统,使用Java语言编写和测试。 02 第一种解法 队列的特性是先进先出,而栈的特性是先进后去,在使用栈进行队列的出队列和队顶操作时,需要借助另外一个栈来进行反转然后再还原,而入队列的操作还是无需特殊处理。
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. ...
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. ...