1classMyQueue(object):2i_stack =[]3o_stack =[]4def__init__(self):5"""6Initialize your data structure here.7"""8self.i_stack =[]9self.o_stack =[]1011defpush(self, x):12"""13Push element x to the back of queue.14:type x: int15:rtype: void16"""17self.i_stack.append(...
out (2) (3) 6 (1) stack1(in): is the only stack to store new elements when adding a new element into the queue stack2(out): is the only stack to pop old element out of the queue. when stack2 is empty, we move all data from stack1(in) to stack2(out) if any **/publicc...
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...
如果stack 2 为空,则把 stack 1的元素全部移动到 stack 2,并返回栈顶元素 pop() 类似于peek,但是在返回的时候是移除操作并返回该元素。 1 读题 LeetCode 232E 用栈实现队列 Implement Queue using Stacks 2 Python 解题 正如咱们前面那个问题,list 既可以实现栈,还能实现列表,所以咱这题的代码,和那个队列模...
You may assume that all operations are valid (for example, no pop or top operations will be called on an empty stack). 要求使用双队列实现一个栈的所有的功能,是一个很经典的问题,需要记住学习。 建议和这道题leetcode 232. Implement Queue using Stacks 双栈实现队列 一起学习。
Depending on your language, the queue may not be supported natively. You may simulate a queue using a list or deque (double-ended queue) as long as you use only a queue's standard operations. Example 1: Input ["MyStack", "push", "push", "top", "pop", "empty"] ...
Stack<Integer> helper; public MyQueue() { data = new Stack(); helper = new Stack(); } public void push(int x) { data.add(x); } public int pop() { while (!data.isEmpty()) { helper.add(data.pop()); } int res = helper.pop(); ...
分析:用两个Stack实现queue,这里我们在pop和peek操作是都需要更新Stack2来保证Stack2非空的。另外Stack2应该在为empty后再填充,才能保证原有的位置没有发生改变。 例如:push1 push2 ,pop1 后 stack2 应该还留下了2,此时进行push3 push4 后我们不应该将3,4push到stack2中,因为stack2中还不是空的 。如果push...
{// Remove the transfer request in order to make room in the// queue for more transfers. Transfers are not automatically// removed by the system.RemoveTransferRequest(transfer.RequestId);// In this example, the downloaded file is moved into the root// Isolated Storage directoryusing(...
Or, you could save the transfer information and add it to the queue at a later time when slots are available. Next, get the URL string and create a URI object from it. If the URL string has not already been escaped, do so using EscapeUriString. Pass this URI to the constructor for...