Recall & Review
beginner
What is the first step when deleting a node at a specific position in a singly linked list?
Check if the list is empty or if the position is valid (greater than 0). If invalid, no deletion should occur.
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beginner
How do you delete the head node (position 1) in a singly linked list?
Update the head pointer to point to the second node, then free the original head node's memory.
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intermediate
Why do we need to keep track of the previous node when deleting a node at a specific position (other than head)?
Because we must update the previous node's next pointer to skip the node being deleted and link to the next node after it.
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beginner
What happens if the position to delete is greater than the length of the linked list?
No deletion occurs because the position is invalid; the list remains unchanged.
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beginner
In C, why is it important to free the memory of the deleted node?
To avoid memory leaks by releasing the allocated memory back to the system.
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What should you do first when deleting a node at position 3 in a singly linked list?
✗ Incorrect
You must reach the node before the one to delete (position 2) to update its next pointer.
If you want to delete the first node in a linked list, what pointer do you update?
✗ Incorrect
The head pointer must be updated to point to the second node.
What happens if you try to delete a node at position 10 but the list has only 5 nodes?
✗ Incorrect
Position 10 is invalid, so no deletion happens.
Why do you need to free memory after deleting a node in C?
✗ Incorrect
Freeing memory prevents memory leaks by releasing unused memory.
Which pointer is updated to remove a node from the middle of a linked list?
✗ Incorrect
The previous node's next pointer is updated to skip the deleted node.
Explain the steps to delete a node at a specific position in a singly linked list.
Think about handling the head node separately and updating pointers carefully.
You got /5 concepts.
Why is it important to handle boundary cases when deleting nodes in a linked list?
Consider what happens if you try to delete a node that does not exist.
You got /4 concepts.