Insert at Beginning Head Insert 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'

Ahead

BNone

Cdata

Dnext

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'head' instead of 'data' when creating the new node.

Passing 'None' or 'next' instead of the data value.

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 of the list.

DSA Python

new_node.next = [1]

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

Ahead

BNone

Cdata

Dnew_node

Attempts:

3 left

💡 Hint

Common Mistakes

Setting new_node.next to itself.

Setting new_node.next to None or data.

The new node's next pointer should point to the current head node.

3fill in blank

hard

Fix the error in updating the head pointer to the new node.

DSA Python

head = [1]

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

Adata

BNone

Chead.next

Dnew_node

Attempts:

3 left

💡 Hint

Common Mistakes

Assigning head to data or None instead of new_node.

Assigning head to head.next which skips the new node.

After insertion, the head should point to the new node.

4fill in blank

hard

Fill both blanks to complete the function that inserts a new node at the beginning.

DSA Python

def insert_at_beginning(head, [1]):
    new_node = Node(data)
    new_node.next = [2]
    head = new_node
    return head

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

Adata

Bhead.next

Chead

Dnew_node

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'head.next' instead of 'head' for new_node.next.

Using 'new_node' as a parameter instead of 'data'.

The function takes 'data' as input and links new_node.next to current head.

5fill in blank

hard

Fill all three blanks to complete the full insert at beginning function with Node class.

DSA Python

class Node:
    def __init__(self, data):
        self.data = data
        self.next = None

def insert_at_beginning([1], [2]):
    new_node = Node(data)
    new_node.next = [3]
    head = new_node
    return head

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

Ahead

Bdata

Dnew_node

Attempts:

3 left

💡 Hint

Common Mistakes

Swapping parameter order or names.

Setting new_node.next to new_node instead of head.

The function takes head and data, links new_node.next to head, and returns new_node as new head.