Difference between Singly Linked List and Doubly Linked List — DSA Technical Interview Questions & Answers

Difference between Singly Linked List and Doubly Linked List

Difference between Singly Linked List and Doubly Linked List

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

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

Code Examples for Difference between Singly Linked List and Doubly Linked List

Difference between Singly Linked List and Doubly 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

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

How to Explain Difference between Singly Linked List and Doubly Linked List to an Interviewer

What is Difference between Singly Linked List and Doubly Linked List?

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

Give one small example of Difference between Singly Linked List and Doubly Linked List.

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

What mistake do beginners make with Difference between Singly Linked List and Doubly Linked List?

losing the next pointer on delete Show the fix

Where do you use Difference between Singly Linked List and Doubly Linked List?

a counter a ticket queue node