【Leetcode 225】 Implement Stack using Queues - EASY 题目 思路 题解 反思 复杂度分析 思路反思 扩展学习 方法1 方法2 题目 Implement the following operations of a stack using queues. push(x) – Push element x onto stack. pop() &... 查看原文 Leetcode 225. Implement Stack using Queues ...
publicclassMyStack{ Queue<Integer> q;publicMyStack(){// int size():获取队列长度;//boolean add(E)/boolean offer(E):添加元素到队尾;//E remove()/E poll():获取队首元素并从队列中删除;//E element()/E peek():获取队首元素但并不从队列中删除。q =newLinkedList<>(); }publicvoidpush(int...
Implement the following operations of a stack using queues. 使用队列实现堆栈的以下操作。 push(x) -- Push element x onto stack. push(x) - 将元素x推入堆栈。 pop() -- Removes the element on top of the stack. pop() - 删除堆栈顶部的元素。 top() -- Get the top element. top() - 获...
Depending on your language, stack may not be supported natively. You may simulate a stack by using a list or deque (double-ended queue), as long as you use only standard operations of a stack. You may assume that all operations are valid (for example, no pop or peek operations will be...
Implement Stack using Queues 用队列实现栈 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....
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.
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. ...
classMyStack{Queue<Integer>queue;/** Initialize your data structure here. */publicMyStack(){queue=newLinkedList<>();}/** Push element x onto stack. */publicvoidpush(intx){queue.offer(x);intsize=queue.size();while(size>1){queue.offer(queue.poll());size--;}}/** Removes the element...
Queue using Stacks 双栈实现队列 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) 4)出栈:将有元素的队列出列即可。 参考这个博客...
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, and empty). Implement the MyStack class: void push(int x) Pushes element x to the top of the stack. int pop() Removes the el...