Node Structure and Pointer Design in DSA Python - Interactive Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a Node class with a constructor that initializes the data and next pointer.

DSA Python

class Node:
    def __init__(self, data):
        self.data = data
        self.[1] = None

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

Apointer

Bprev

Clink

Dnext

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'prev' instead of 'next' for singly linked list nodes.

Using generic names like 'pointer' or 'link' which are not standard.

The next attribute is used to point to the next node in a linked list.

2fill in blank

medium

Complete the code to create a new node and link it as the next node of the head.

DSA Python

head = Node(10)
new_node = Node(20)
head.[1] = new_node

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

Anext

Bprev

Clink

Dpointer

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'prev' which is for doubly linked lists.

Using incorrect attribute names like 'link' or 'pointer'.

To link nodes in a singly linked list, assign the new node to the next attribute of the current node.

3fill in blank

hard

Fix the error in the code to correctly traverse the linked list and print all node data.

DSA Python

current = head
while current is not None:
    print(current.data)
    current = current.[1]

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

Anext

Blink

Cpointer

Dprev

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'prev' which would cause errors in singly linked lists.

Using undefined attributes like 'pointer' or 'link'.

To move to the next node in the list, use the next attribute.

4fill in blank

hard

Fill both blanks to create a linked list with three nodes and link them correctly.

DSA Python

head = Node(1)
second = Node(2)
third = Node(3)
head.[1] = second
second.[2] = third

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

Anext

Bprev

Clink

Dpointer

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'prev' which is for doubly linked lists.

Using inconsistent attribute names for linking.

Each node's next attribute points to the following node in the list.

5fill in blank

hard

Fill all three blanks to create a Node class with data, next pointer, and a method to set the next node.

DSA Python

class Node:
    def __init__(self, [1]):
        self.data = [1]
        self.[2] = None
    def set_next(self, node):
        self.[3] = node

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

Adata

Bnext

Dpointer

Attempts:

3 left

💡 Hint

Common Mistakes

Using different names for the next pointer in different places.

Not initializing the next pointer to None.

The constructor takes data, initializes next to None, and the set_next method sets the next pointer.