Linked List — DSA Technical Interview Questions & Answers

Linked List

Linked List

  • 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 Linked List.
  • From the example next to this theory: 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 Linked List? Then show head → next → …. Then name the trap.

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

Code Examples for Linked List

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

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

How to Explain Linked List to an Interviewer

What is Linked List?

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

Give one small example of Linked List.

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

What mistake do beginners make with Linked List?

losing the next pointer on delete Show the fix

Where do you use Linked List?

a counter a ticket queue node