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;/** * ...
}/**Push element x onto stack.*/publicvoidpush(intx) {if(num == 1){ queue1.add(x); }else{ queue2.add(x); } }/**Removes the element on top of the stack and returns that element.*/publicintpop() {if(num == 1){intsize =queue1.size();for(inti = 0; i < size - 1; ...
## 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## ...
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 use only standard oper...
self._filled = self.queue2 def push(self, x): """ Push element x onto stack. :type x: int :rtype: void """ # 向有值的队列中添加值 self._filled.append(x) def pop(self): """ Removes the element on top of the stack and returns that element. ...
empty() -- Return whether the stack is empty. Notes: You must use only standard operations of a queue -- which means only push to back , peek/pop from front , size , and is empty Depending on your language, queue may not be supported natively. You may simulate a queue by using a...
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。
(self):"""Initialize your data structure here."""# 声明两个队列,由于模拟栈self.queue1 = deque()self.queue2 = deque()# self._empty指向当前空的队列self._empty = self.queue1# self._filled指向当前有填充的队列self._filled = self.queue2def push(self, x):"""Push element x onto stack....
}// Return whether the stack is empty.boolempty(){returnq1.empty() && q2.empty(); }private: queue<int> q1; queue<int> q2;voidgather(queue<int>& q1, queue<int>& q2){while(!q2.empty()) { q1.push(q2.front()); q2.pop(); ...
225. 用队列实现栈 - 请你仅使用两个队列实现一个后入先出(LIFO)的栈,并支持普通栈的全部四种操作(push、top、pop 和 empty)。 实现 MyStack 类: * void push(int x) 将元素 x 压入栈顶。 * int pop() 移除并返回栈顶元素。 * int top() 返回栈顶元素。 * boole