Traversal and Printing a Linked List in DSA Python - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the main purpose of traversing a linked list?

To visit each node in the linked list one by one, usually to read or print the data stored in each node.

beginner

In a singly linked list, how do you move from one node to the next?

By following the 'next' pointer/reference stored in the current node to reach the next node.

beginner

What condition tells you that you have reached the end of a linked list during traversal?

When the 'next' pointer/reference of the current node is None (or null in other languages), it means the end of the list.

beginner

Why is it important to start traversal from the head node of a linked list?

Because the head node is the entry point to the list; without it, you cannot access the other nodes.

beginner

What is the output format when printing a linked list like 1 -> 2 -> 3 -> null?

It shows the sequence of node values connected by arrows, ending with 'null' to indicate the list ends.

What does the 'next' pointer in a linked list node represent?

A The size of the list

B The data stored in the node

C The previous node in the list

D The address of the next node in the list

The 'next' pointer holds the address/reference to the next node, allowing traversal.

How do you know when to stop traversing a linked list?

A When the head node is reached

B After visiting 10 nodes

C When the current node's next pointer is null

D When the current node's data is zero

Traversal stops when the next pointer is null, meaning no more nodes.

Which node do you start with when printing a linked list?

A The head node

B The last node

C Any random node

D The middle node

Traversal and printing always start from the head node.

What is the output of printing a linked list with nodes containing 5, 10, 15?

A null -> 5 -> 10 -> 15

B 5 -> 10 -> 15 -> null

C 15 -> 10 -> 5 -> null

D 5, 10, 15

The list is printed from head to tail with arrows and ends with null.

What happens if you try to traverse a linked list starting from a null head?

A Nothing is printed because the list is empty

B It prints all nodes

C It causes an error

D It prints null repeatedly

A null head means the list is empty, so no nodes to print.

Explain step-by-step how to traverse and print all elements of a singly linked list.

Think about visiting each node one by one until the end.

Describe how the linked list structure supports traversal and printing of its elements.

Focus on the role of the next pointer and head node.