In a doubly linked list, what is the time complexity for deleting a node given a

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Question: In a doubly linked list, what is the time complexity for deleting a node given a pointer to that node?

Options:

Correct Answer: O(1)

Solution:

Deletion of a node in a doubly linked list can be done in O(1) time if you have a pointer to the node.

In a doubly linked list, what is the time complexity for deleting a node given a pointer to that node?

In a doubly linked list, what is the time complexity for deleting a node given a pointer to that node?

Step 1: Understand that a doubly linked list has nodes that contain data and two pointers: one pointing to the next node and one pointing to the previous node.
Step 2: When you have a pointer to the node you want to delete, you can access its previous and next nodes directly.
Step 3: To delete the node, you need to adjust the pointers of the previous node and the next node. Specifically, set the next pointer of the previous node to point to the next node, and set the previous pointer of the next node to point to the previous node.
Step 4: After adjusting the pointers, you can safely remove the node from memory (if needed).
Step 5: Since you are directly accessing the pointers and making changes without needing to traverse the list, this operation takes constant time, which is O(1).

Doubly Linked List Deletion – Understanding how to delete a node in a doubly linked list when given a pointer to that node.