Insert at Beginning of Circular Linked List in DSA Python - Interactive Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a new node with the given data.

DSA Python

new_node = Node([1])

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

Adata

Bhead

CNone

Dtail

Attempts:

3 left

💡 Hint

Common Mistakes

Using head or tail instead of data when creating the new node.

Passing None instead of data.

We create a new node by passing the data value to the Node constructor.

2fill in blank

medium

Complete the code to link the new node to the current head node.

DSA Python

new_node.next = [1]

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

Atail

Bhead

Cnew_node

DNone

Attempts:

3 left

💡 Hint

Common Mistakes

Pointing new_node.next to tail or None instead of head.

Pointing new_node.next to itself.

The new node should point to the current head to insert at the beginning.

3fill in blank

hard

Fix the error in updating the tail's next pointer to the new node.

DSA Python

tail.next = [1]

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

Anew_node

Bhead

CNone

Dtail

Attempts:

3 left

💡 Hint

Common Mistakes

Setting tail.next to head or None breaks the circular link.

Setting tail.next to tail causes a loop on tail only.

The tail's next should point to the new node to maintain circularity.

4fill in blank

hard

Fill both blanks to update the head pointer and handle empty list case.

DSA Python

if head is None:
    head = [1]
    tail = [2]

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

Anew_node

Bhead

Ctail

DNone

Attempts:

3 left

💡 Hint

Common Mistakes

Assigning head or tail to None instead of new_node.

Assigning head and tail to different nodes.

When the list is empty, head and tail both point to the new node.

5fill in blank

hard

Fill all three blanks to complete the insert at beginning function.

DSA Python

def insert_at_beginning(head, tail, data):
    new_node = Node([1])
    if head is None:
        head = new_node
        tail = new_node
        tail.next = [2]
    else:
        new_node.next = head
        tail.next = [3]
        head = new_node
    return head, tail

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

Adata

Bnew_node

Chead

Dtail

Attempts:

3 left

💡 Hint

Common Mistakes

Using head instead of new_node for tail.next.

Not updating tail.next to new_node breaks circular link.

Returning wrong variables or missing return.

We create new_node with data, tail.next points to new_node to keep circular link, and update tail.next to new_node when list is not empty.