Queue (Implementation)
Explore how to implement a queue data structure in Python using a doubly linked list. Understand the design of core queue methods such as enqueue, dequeue, is_empty, front, and rear, and learn about their efficient O(1) time complexities. This lesson guides you through writing a Queue class and using helper functions to manage queue operations effectively.
We'll cover the following...
Implementation of Queues
Queues are implemented in many ways. They can be represented by using lists, Linked Lists, or even Stacks. But most commonly lists are used as the easiest way to implement Queues.
With typical arrays, however, the time complexity is O(n) when dequeuing an element from the beginning of the queue. This is because when an element is removed, the addresses of all the subsequent elements must be shifted by 1, which makes it less efficient. With linked lists and doubly linked lists, the operations become faster.
Here, we will use a doubly-linked list to implement queues.
A typical Queue must contain the following standard methods:
enqueue(element)dequeue()