Answered: Stack, Queue and Deque 5.1. Understand…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Stack, Queue and Deque
5.1. Understand the basic operations for Stack, Queue and Deque
Example: Suppose that Queue q is implemented by a circular array data with the size 3. Please draw
the state of the Queue q and circular array data after each of the following steps.
1) Queue q = new Queue();
2) q.enqueue(5);
3) q.enqueue (2);
4) q.enqueue (9);

Expert Solution

Step 1: Introduction of Stack, Queue and Deque

Stack:
- A stack is a linear data structure that follows the Last In, First Out (LIFO) principle.
- It implies that the element that is inserted last is the first one to be deleted.
- The operations commonly associated with a stack are push (inserting an element onto the stack) and pop (removing an element from the stack).
Queue:
- A queue is a linear data structure that follows the First In, First Out (FIFO) principle.
- It implies that the element that is inserted first is the first one to be deleted.
- The operations commonly associated with a queue are enqueue (inserting an element into the queue) and dequeue (removing an element from the queue).
Deque (Double-ended Queue):
- A deque is a generalization of both stacks and queues that supports insertion and deletion at both the front and the rear.
- It allows the insertion and deletion of elements from both ends, thus it is called a double-ended queue.
- The operations associated with a deque include insertFront, insertLast, deleteFront, deleteLast, etc.

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