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;/** * ...
self.q.put(self.top_element)returnself.q.get()deftop(self) ->int:returnself.top_elementdefempty(self) ->bool:returnself.q.qsize() == 0 1classMyStack {2private: queue<int>q;3public:4/** Initialize your data structure here.*/5MyStack() {67}89/** Push element x onto stack.*/...
classMyStack(object):def__init__(self):self.queue=collections.deque()defpush(self,x):""":type x: int:rtype: None"""n=len(self.queue)self.queue.append(x)foriinrange(n):self.queue.append(self.queue.popleft())defpop(self):""":rtype: int"""returnself.queue.popleft()deftop(self)...
Depending on your language, queue may not be supported natively. You may simulate a queue by using a list or deque (double-ended queue), as long as you use only standard operations of a queue. You may assume that all operations are valid (for example, no pop or top operations will be...
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...
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):"""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....
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 deque (double-ended queue), as long as you use only st...
# or top operations will be called on an empty stack). # class Queue: def __init__(self): self.data = collections.deque() def push(self, x): self.data.append(x) def peek(self): return self.data[0] def pop(self): return self.data.popleft() def size(self): ...
Okay, if you’re threading, you can’t uselistfor a stack and you probably don’t want to usedequefor a stack, so howcanyou build a Python stack for a threaded program? The answer is in thequeuemodule,queue.LifoQueue. Remember how you learned that stacks operate on the Last-In/First...