用堆栈(stack) 实现队列(queue)

该博客讨论了如何仅使用两个堆栈实现队列,包括enqueue、dequeue和peek操作。博主解释了两种方法,一种是每次插入元素时反转堆栈,另一种是通过在需要时将一个堆栈的元素转移到另一个堆栈来保持队列顺序。博客提供了一个高效的解决方案,通过两个堆栈分别存储最新和最旧元素,并展示了如何在C++中实现这些操作。

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原题在这里:

https://www.hackerrank.com/challenges/ctci-queue-using-two-stacks/problem?h_l=interview&playlist_slugs%5B%5D=interview-preparation-kit&playlist_slugs%5B%5D=stacks-queues

 

queue is an abstract data type that maintains the order in which elements were added to it, allowing the oldest elements to be removed from the front and new elements to be added to the rear. This is called a First-In-First-Out (FIFO) data structure because the first element added to the queue (i.e., the one that has been waiting the longest) is always the first one to be removed.

A basic queue has the following operations:

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