What is the most efficient way to implement a stack and queue using one array?

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Stacks and queues are two common data structures that store and process elements in a specific order. A stack follows the last-in, first-out (LIFO) principle, where the last element added is the first one removed. A queue follows the first-in, first-out (FIFO) principle, where the first element added is the first one removed. In this article, you will learn what is the most efficient way to implement a stack and queue using one array.