What is a Doubly Linked List (DLL)?
Explore the fundamentals of doubly linked lists, understanding their bi-directional nodes that point both forward and backward. Learn how this structure simplifies traversal and deletion operations compared to singly linked lists, and see how to implement and delete nodes efficiently in Java for coding interviews.
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Introduction
Often, we need to traverse through the whole list – the most time-consuming operation in linked lists—to perform the basic operations. Although we have to traverse an array as well, an array element can be accessed in O(1) by the index because array elements are present on contiguous memory locations. In linked lists, however, the nodes are not present on contiguous memory locations. Therefore, you will need to traverse all the nodes to get to the desired node.
Another concern that must be taken into account here is that linked lists are unidirectional: they can only move forward, not backward. Also, while ...