Introduction to Queue
Explore the fundamentals of queue data structures that follow the first in, first out (FIFO) principle. Understand key operations such as enqueue, dequeue, and peek, and discover their practical uses in task scheduling, buffering data, and algorithm design. This lesson helps you grasp how queues manage ordered data flow efficiently in computer science.
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Long before queues were formalized as a data structure, programmers needed a way to manage a growing list of tasks that must be processed in the order they arrive. Early computers handled jobs from multiple users concurrently, and without a defined ordering mechanism, task scheduling was neither fair nor predictable. The queue data structure was introduced to enforce this ordering.
What is a queue?
A queue is a linear data structure that follows the first in, first out (FIFO) principle. This means the first element added to the queue is the first one to be removed.
A queue is analogous to a line of people waiting for service. The first person in line is served first. New entries are added at the back, and removals occur from the front.
