Recall & Review
beginner
What does 'Delete Node at End' mean in a linked list?
It means removing the last node from a linked list, so the second last node becomes the new end.
Click to reveal answer
beginner
Why do we need to find the second last node when deleting the last node in a singly linked list?
Because the second last node's next pointer must be set to None to remove the last node.
Click to reveal answer
beginner
What happens if you try to delete the last node in an empty linked list?
Nothing happens because the list is empty; there is no node to delete.
Click to reveal answer
beginner
In a singly linked list with one node, what happens when you delete the last node?
The list becomes empty because the only node is removed.
Click to reveal answer
intermediate
What is the time complexity of deleting the last node in a singly linked list?
O(n), because you need to traverse the list to find the second last node.
Click to reveal answer
What pointer do you update when deleting the last node in a singly linked list?
✗ Incorrect
You update the next pointer of the second last node to None to remove the last node.
What is the new last node after deleting the last node?
✗ Incorrect
The node before the deleted node becomes the new last node.
If a linked list has only one node, what happens after deleting the last node?
✗ Incorrect
Deleting the only node makes the list empty.
What is the time complexity to delete the last node in a singly linked list?
✗ Incorrect
You must traverse the list to find the second last node, so it takes O(n) time.
What happens if you try to delete the last node from an empty linked list?
✗ Incorrect
Since the list is empty, there is no node to delete, so nothing happens.
Explain step-by-step how to delete the last node in a singly linked list.
Think about what happens when the list is empty or has one node.
You got /4 concepts.
Describe the changes in pointers when deleting the last node in a singly linked list.
Focus on the next pointer of the node before the last.
You got /3 concepts.