Traversal of Circular Linked List in DSA Python - Interactive Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to start traversal from the head node.

DSA Python

current = [1]

Drag options to blanks, or click blank then click option'

Acurrent.next

Btail

CNone

Dhead

Attempts:

3 left

💡 Hint

Common Mistakes

Starting traversal from tail instead of head.

Using None as starting point.

The traversal of a circular linked list starts from the head node.

2fill in blank

medium

Complete the code to move to the next node during traversal.

DSA Python

current = current[1]

Drag options to blanks, or click blank then click option'

A.next

B.tail

C.prev

D.head

Attempts:

3 left

💡 Hint

Common Mistakes

Using .prev which goes backward.

Using .head or .tail which are not node attributes.

To traverse the list, move to the next node using .next.

3fill in blank

hard

Fix the error in the loop condition to stop traversal after one full cycle.

DSA Python

while current != [1]:
    print(current.data)
    current = current.next

Drag options to blanks, or click blank then click option'

ANone

Bhead

Ccurrent

Dtail

Attempts:

3 left

💡 Hint

Common Mistakes

Using None as stopping condition causes infinite loop.

Using tail or current as stopping condition is incorrect.

Traversal should stop when current reaches the head again, completing one full cycle.

4fill in blank

hard

Fill both blanks to correctly print all nodes in the circular linked list once.

DSA Python

print(current.data)
current = current[1]
while current != [2]:
    print(current.data)
    current = current.next

Drag options to blanks, or click blank then click option'

A.next

B.prev

Chead

Dtail

Attempts:

3 left

💡 Hint

Common Mistakes

Using .prev moves backward, causing wrong traversal.

Stopping at tail instead of head causes incomplete traversal.

Start by printing the current node's data, move to next node, then loop until back at head.

5fill in blank

hard

Fill all three blanks to create a dictionary mapping node data to their next node's data.

DSA Python

mapping = { [1]: [2] for node in nodes if node.data != [3] }

Drag options to blanks, or click blank then click option'

Anode.data

Bnode.next.data

CNone

Dhead.data

Attempts:

3 left

💡 Hint

Common Mistakes

Using None instead of head.data causes wrong filtering.

Swapping key and value reverses the mapping.

This dictionary comprehension maps each node's data to the next node's data, skipping the head node.