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Queues in DSA: The Complete Guide (FIFO, Operations, Code Examples)

Introduction

In Data Structures and Algorithms (DSA), a queue is a fundamental linear data structure that follows the First-In-First-Out (FIFO) principle. Queues are widely used in various applications, including scheduling processes, managing tasks in operating systems, and handling requests in web servers. This article delves into the concept of queues, their types, operations, time and space complexities, and real-world applications.

What is a Queue?

A queue is a collection of elements that supports two primary operations:

  1. Enqueue: Adding an element to the end of the queue.
  2. Dequeue: Removing an element from the front of the queue.

Queues operate on a FIFO basis, meaning the first element added to the queue will be the first one removed.

 

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