Recall & Review
beginner
What is a doubly linked list?
A doubly linked list is a chain of nodes where each node has three parts: data, a pointer to the next node, and a pointer to the previous node. This allows moving forward and backward through the list.
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beginner
What does 'delete by value' mean in a doubly linked list?
It means finding the first node that contains a specific value and removing it from the list, adjusting the links so the list stays connected.
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intermediate
Which pointers need to be updated when deleting a node in a doubly linked list?
You must update the previous node's next pointer and the next node's previous pointer to skip the deleted node.
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intermediate
What happens if the node to delete is the head of the doubly linked list?
The head pointer must be updated to point to the next node, and if that node exists, its previous pointer should be set to NULL.
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intermediate
Show the basic steps to delete a node by value in a doubly linked list in C.
1. Traverse the list to find the node with the value.<br>2. If not found, do nothing.<br>3. If found, update the previous node's next pointer and the next node's previous pointer.<br>4. If the node is head, update the head pointer.<br>5. Free the node's memory.
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In a doubly linked list, what pointer does each node have besides the data?
✗ Incorrect
Each node has two pointers: one to the next node and one to the previous node.
When deleting a node by value, what should you do if the value is not found?
✗ Incorrect
If the value is not found, no deletion should happen.
If the node to delete is the last node, which pointer must be updated?
✗ Incorrect
The previous node's next pointer should be set to NULL to mark the end of the list.
What is the first step to delete a node by value in a doubly linked list?
✗ Incorrect
You must first find the node with the given value by traversing the list.
After deleting a node, what must you do to avoid memory leaks in C?
✗ Incorrect
You must free the memory of the deleted node to avoid memory leaks.
Explain the process of deleting a node by value in a doubly linked list.
Think about how the links before and after the node change.
You got /6 concepts.
Describe how pointers change when deleting the head node in a doubly linked list.
Focus on the start of the list and the first node.
You got /3 concepts.