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Difference between Stack and Queue Data Structures. Stack:- A stack is a linear data structure in which elements can be inserted and deleted only from one. csci 210: Data Structures Stacks and Queues as abstract data types (ADT) dequeue(): delete and return the front of queue (the first inserted element). Here, we are going to implement stack using arrays, which makes it a fixed size stack implementation. Page 3. Data Structures. 61. Basic Operations. Enqueue Operation: Queues maintain two data pointers, front and rear. Therefore, its operations are comparatively difficult to implement than that of stacks. Queue is an abstract data structure, somewhat similar to stack. In contrast to stack, queue is opened at both end. One end is always used to insert data Priority Queue ADT: insert comparable object, deleteMin. • Binary heap data structure: Complete binary tree where each node has priority value greater than Queues are data structures that, like the stack, have restrictions on where you can add and remove elements. To understand a queue, think of a cafeteriaYou need to implement an appropriate data storage mechanism to store these requests in the system. Page 13. Implementing a Queue Using an Array (Contd.) How can Data structure with Last-In First on Queue isempty: determines if the queue is empty isfull: determines if the queue is full.