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 **/publicclassQueueUseStack {privateD...
Implement Queue by Two Stacks 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. 1classMy...
class QueueTwoStacks(object): # Implement the enqueue and dequeue methods def enqueue(self, item): pass def dequeue(self): pass # Tests class Test(unittest.TestCase): def test_basic_queue_operations(self): queue = QueueTwoStacks() queue.enqueue(1) queue.enqueue(2) queue.enqueue(3) actual...
http://www.lintcode.com/en/problem/implement-queue-by-two-stacks/ 【题目解析】 用两个Stack来实现一个Queue,可以考虑到push()时,几乎与Queue中的offer()一样,都是加在末尾,区别是当Stack pop()时,取出的是最近加入(newest)的元素,而Queue用poll()则是将最老(oldest)的元素取出。使用2个Stack,可以将s...
1. 232 Implement Queue using Stacks 1.1 问题描写叙述 使用栈模拟实现队列。模拟实现例如以下操作: push(x). 将元素x放入队尾。 pop(). 移除队首元素。 peek(). 获取队首元素。 empty(). 推断队列是否为空。 注意:仅仅能使用栈的标准操作,push,pop,size和empty函数。
Step 1: Design Your Directory Step 2: Implement Your Directory Step 3: Improve Your Directory Sending Your First Distribution XM Directory Maintenance & Organization Tips XM Directory Data Usage & Best Practices Summary Tab Fields You Can Filter Contacts By Directory Contacts Tab Segments & Lists...
Implement a first in first out (FIFO) queue using only two stacks. The implemented queue should support all the functions of a normal queue (push,peek,pop, andempty). Implement theMyQueueclass: void push(int x)Pushes element x to the back of the queue. ...
3.5 Implement a MyQueue class which implements a queue using two stacks.LeetCode上的原题,请参见我之前的博客Implement Queue using Stacks 用栈来实现队列。
The queue should supportpush(element),pop()andtop()where pop is pop the first(a.k.a front) element in the queue. Both pop and top methods should return the value of first element. 来源:http://www.lintcode.com/en/problem/implement-queue-by-two-stacks/ ...
This post will discuss how to implement two stacks in a single array efficiently... The idea is to grow stacks from two extreme corners of the array.