Understanding deletion of the given node

This is another scenario where a doubly linked list outperforms a singly linked list. The presence of a previous pointer in each node eliminates the need to traverse the list to locate the node immediately preceding the one that needs to be deleted. Let's examine all the potential cases we need to consider.

1. The list is empty

If the list is empty and contains no elements, we cannot find the given node because it does not exist within the list. Therefore, deleting the given node is not possible because there is no reference point within the list to perform the deletion. In this case, we can return the existing head, as the list is empty, and no node needs to be deleted.