Recall & Review
beginner
What is a circular linked list?
A circular linked list is a linked list where the last node points back to the first node, forming a circle with no end.
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beginner
How do you know when to stop traversing a circular linked list?
You stop when you reach the starting node again after moving through the list, to avoid infinite loops.
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beginner
Why can't you use 'null' to stop traversal in a circular linked list?
Because in a circular linked list, there is no 'null' at the end; the last node points back to the first node.
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intermediate
Show the basic Python code snippet to traverse a circular linked list starting from the head node.
current = head
while True:
print(current.data)
current = current.next
if current == head:
break
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beginner
What is the main difference between traversing a singly linked list and a circular linked list?
In a singly linked list, traversal stops when the next node is null. In a circular linked list, traversal stops when you return to the starting node.
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What condition is used to stop traversal in a circular linked list?
✗ Incorrect
Traversal stops when the current node is the head node again, indicating a full circle.
In a circular linked list, what does the last node point to?
✗ Incorrect
The last node points back to the head node to form a circle.
Why is it important to check if current == head during traversal?
✗ Incorrect
Checking current == head prevents infinite loops by stopping traversal after one full cycle.
What happens if you forget to check current == head in traversal?
✗ Incorrect
Without the check, traversal loops endlessly because the list is circular.
Which data structure is best described as a circular linked list?
✗ Incorrect
A circular linked list has its last node pointing back to the first node.
Explain how to traverse a circular linked list and how to avoid infinite loops.
Think about what makes circular linked lists different from normal linked lists.
You got /4 concepts.
Describe the key difference between singly linked list traversal and circular linked list traversal.
Focus on how the end of the list is identified in each case.
You got /4 concepts.