1. 232 Implement Queue using Stacks 1.1 问题描写叙述 使用栈模拟实现队列.模拟实现例如以下操作: push(x). 将元素x放入队尾. pop(). 移除队首元素. peek(). 获取队首元素. empty(). 推断队列是否为空. 注意:仅仅能使用栈的标准操作,push,pop,size和empty函数. 1.2 方法与思路 本题和用队列实现栈思路一样,设两个辅助栈stk1和stk2. push(x): 将x入栈stk1. pop(): 依次将stk1…

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…

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…

题目描述: 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. Note…

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…

Stack<Integer> stack=new Stack<Integer>(); public void push(int x) { stack.push(x); } // Removes the element from in front of queue. public void pop() { stack.remove(0); } // Get the front element. public int peek() { return stack.get(0); } //…

本题用两个栈实现队列,用栈的基本操作去实现队列的所有基本操作push(),pop(),peek()以及empty() sa作为输入栈,sb作为输出栈,将sa输入元素的反转过来放到sb中 push与sa有关,而pop(),peek()与sb有关,即将sa输入元素出栈放到sb中(函数move). 为此,只有两个栈为空才能让队列为空 class Queue { public: // Push element x to the back of queue. stack<int> sa; stack&l…

class MyQueue { public: /** Initialize your data structure here. */ MyQueue() { } /** Push element x to the back of queue. */ void push(int x) { stkPush.push(x); } /** Removes the element from in front of queue and returns that element. */ int pop()…

155. Min Stack class MinStack { public: /** initialize your data structure here. */ MinStack() { } void push(int x) { if(s1.empty() && s2.empty()){ s1.push(x); s2.push(x); } else{ if(x < s2.top()){ s1.push(x); s2.push(x); } else{ s1.push(x); s2…

232. Implement Queue using Stacks Total Accepted: 27024 Total Submissions: 79793 Difficulty: Easy 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 o…