}/** Push element x onto stack. */publicvoidpush(intx){ top = x; q1.add(x); }/** Removes the element on top of the stack and returns that element. */publicintpop(){if(q1.size() ==0) {thrownewNoSuchElementException("[ERROR] The stack is empty!"); }while(q1.size() >1)...
LeetCode 225 Implement Stack using Queues(用队列来实现栈)(*) 翻译 push(x) —— 将元素x加入进栈 pop() —— 从栈顶移除元素 top() —— 返回栈顶元素 empty() —— 返回栈是否为空 注意: 你必须使用一个仅仅有标准操作的队列。 ...猜
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 Stack using Queues 描述:简单说就是用两个队列实现一个栈。实现:push()、top()、pop()、empty(). Implement the following operations of a stack using queues. push(x) – Push element x onto stack. pop() – Removes the element on top of the......
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.queue2 def push(self, x): """ Push element x onto stack. :type x: int :rtype: void
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.
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. ...
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 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....