Singly Linked List — DSA Technical Interview Questions & Answers

Singly Linked List

Singly Linked List

  • Singly Linked List is a DSA topic. In plain words you use it for a ticket queue node in a counter. Don’t start with a slogan — start with that picture.
  • Smallest example: head → next → …. Type it, run it, and say what you see. If you can do that from memory, you know Singly Linked List.
  • From the example next to this theory: Singly Linked List — a linked list chains nodes with next pointers instead of contiguous indexes.
  • Trap: losing the next pointer on delete. Fix that before you talk about advanced DSA.
  • Viva: what is Singly Linked List? Then show head → next → …. Then name the trap.

Technical Interview Tip: What is Singly Linked List? Show this: head → next → …. Trap: losing the next pointer on delete.

Code Examples for Singly Linked List

Singly Linked List — working example

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

head = Node(1, Node(2, Node(3)))
cur = head
while cur:
    print(cur.val, end=" -> " if cur.next else "\n")
    cur = cur.next

Singly Linked List — a linked list chains nodes with next pointers instead of contiguous indexes.

How to Explain Singly Linked List to an Interviewer

What is Singly Linked List?

Used for a ticket queue node a counter Not just the heading

Give one small example of Singly Linked List.

head → next → … Singly Linked List — a linked list chains nodes with next pointers instead of contiguous indexes

What mistake do beginners make with Singly Linked List?

losing the next pointer on delete Show the fix

Where do you use Singly Linked List?

a counter a ticket queue node