Circular linked list in Data Structures Theory - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the sentence to define a circular linked list.

Data Structures Theory

A circular linked list is a linked list where the last node points to the [1] node.

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

Ahead

Bnull

Cmiddle

Dtail

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing 'null' because in normal linked lists the last node points to null.

In a circular linked list, the last node points back to the head node, forming a circle.

2fill in blank

medium

Complete the sentence to describe traversal in a circular linked list.

Data Structures Theory

To traverse a circular linked list, you start at the [1] and continue until you reach it again.

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

Anull

Btail

Chead

Dmiddle

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing 'null' because in linear lists traversal ends at null.

Traversal starts at the head node and continues until the head is reached again, completing the circle.

3fill in blank

hard

Fix the error in the statement about circular linked lists.

Data Structures Theory

In a circular linked list, the last node's next pointer is set to [1].

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

Atail

Bhead

Cnull

Dmiddle

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing 'null' which is correct for linear linked lists but not circular ones.

The last node's next pointer should point to the head node, not null.

4fill in blank

hard

Fill both blanks to complete the property of circular linked lists.

Data Structures Theory

In a circular linked list, there is no [1] node, and the [2] node points back to the head.

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

Anull

Btail

Clast

Dfirst

Attempts:

3 left

💡 Hint

Common Mistakes

Thinking there is a null node at the end.

There is no null node in a circular linked list, and the tail node points back to the head.

5fill in blank

hard

Fill all three blanks to describe insertion in a circular linked list.

Data Structures Theory

To insert a new node, set its next pointer to [1], then update the [2] node's next pointer to the new node, and if inserting at the end, update the [3] pointer to the new node.

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

Ahead

Btail

Cnew

Dnull

Attempts:

3 left

💡 Hint

Common Mistakes

Setting next pointer to null, which breaks the circular link.

When inserting, the new node points to the head, the tail node's next pointer is updated to the new node, and the tail pointer is updated if insertion is at the end.