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
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. 思路:采用两个队列模拟 时间复杂度: 代码: classMyStack { Queue<Integer> queue1=newLinkedList<Integer>(); Queue<In...
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## Removes the top element and returnifself.l1:whilelen(self.l1)>1:self.l2.append(...
*/ public void push(int x) { queue.add(x); for (int i = 0; i < queue.size(); i++) { queue.add(queue.poll()); } } /** Removes the element on top of the stack and returns that element. */ public int pop() { return queue.poll(); } /** Get the top element. */ ...
(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....
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. ...
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...
stack.push(1); stack.push(2); (); // returns 2 stack.pop(); // returns 2 stack.empty(); // returns false 1. 2. 3. 4. 5. 6. 7. Notes: You must use only standard operations of a queue – which means only push to back, peek/pop from front, size, and is empty operation...
class Stack2: # initialize your data structure here. def __init__(self): self.q_ = Queue() self.top_ = None # @param x, an integer # @return nothing def push(self, x): self.q_.push(x) self.top_ = x # @return nothing def pop(self): for _ in xrange(sel...
empty() – Return whether the stack is empty. Notes: You may assume that all operations are valid (for example, no pop or top operations will be called on an empty stack). Depending on your language, queue may not be supported natively. You may simulate a queue by using a list or de...