Understanding deletion by given data

Just like in a singly linked list, deleting a node with a given data in a doubly linked list can be done by using the search operation. Instead of returning the data after finding it, we delete it during this operation. Let's explore the possible scenarios to consider when deleting a node with the given data.

1. The list is empty

When the list is empty, meaning it contains no elements, any attempt to delete a node is unnecessary because there are no nodes in the list. Since there is nothing to remove, the list remains unchanged. We can return the existing head, as the list is empty, and no node needs to be deleted.

Algorithm

• Step 1: Return the original head node.

2. The first node is deleted

If the data matches the first node, this case becomes the same as deleting the first node. We update the head to store the reference to the second node and delete the old head.