}/** 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 ...
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 must useonlystandard operatio...
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...
top = queue1.poll(); } return top; } /** Get the top element. */ public int top() { int top = 0; if(queue1.isEmpty()){ while(!queue2.isEmpty()){ top = queue2.poll(); queue1.offer(top); } }else{ while(!queue1.isEmpty()){ top = queue1.poll(); queue2.offer(top...
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. ...
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 ...
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。
empty(); } private: queue<int> q1, q2; }; 这道题还有另一种解法,可以参见另一道类似的题 Implement Queue using Stacks,我个人来讲比较偏爱下面这种方法,比较好记,只要实现对了 push() 函数,后面三个直接调用队列的函数即可。这种方法的原理就是每次把新加入的数插到前头,这样队列保存的顺序和栈的顺序...