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.*/...
top() -- Get the top element. empty() -- Return whether the stack is empty. 我的解法一,python使用collections.deque() classStack(object): def __init__(self):"""initialize your data structure here."""self.queue =collections.deque() def push(self, x):""":type x:int:rtype: nothing...
Implement a last-in-first-out (LIFO) stack using only two queues. The implemented stack should support all the functions of a normal stack (push,top,pop, andempty). Implement theMyStackclass: void push(int x)Pushes element x to the top of the stack. int pop()Removes the element on t...
参考代码 packageleetcodetypeMyStackstruct{enque[]intdeque[]int}/** Initialize your data structure here. */funcConstructor225()MyStack{returnMyStack{[]int{},[]int{}}}/** Push element x onto stack. */func(this*MyStack)Push(xint){this.enque=append(this.enque,x)}/** Removes the element...
Implement the following operations of a stack using queues. 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. ...
(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....
要实现队列,请使用collections.deque设计为具有快速追加和从两端弹出的队列。例如 【Leetcode 225】 Implement Stack using Queues - EASY : push:O(n) pop:O(1) top:O(1) empty:O(1) 空间复杂度: O(1) 思路反思 首先有一点,我们上面所使用的方法是认为队列1和队列2有差别,永远往队列1中插入数据,用...
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...
Implement a last-in-first-out (LIFO) stack using only two queues. The implemented stack should support all the functions of a normal stack (push, top, pop, and empty). Implement the MyStack class: void push(int x) Pushes element x to the top of the stack. int pop() Removes the el...
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): return len(self.data) def empty(self): return len(self.data) == 0 class Stack: # initialize your data structure here...