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;/** * ...
Implement Stack using Queues 参考资料: https://leetcode.com/problems/implement-queue-using-stacks/ https://leetcode.com/problems/implement-queue-using-stacks/discuss/64197/Easy-Java-solution-just-edit-push()-method https://leetcode.com/problems/implement-queue-using-stacks/discuss/64206/Short-O(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## ...
queue2=new LinkedList<>(); } /** Push element x onto stack. */ public void push(int x) { if(queue1.isEmpty()) { queue1.add(x); while(queue2.isEmpty()==false) queue1.add(queue2.poll()); }else { queue2.add(x); while(queue1.isEmpty()==false) queue2.add(queue1.poll(...
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...
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...
(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