Sort a linked list of 0s, 1s and 2s — DSA Technical Interview Questions & Answers

Sort a linked list of 0s, 1s and 2s

Sort a linked list of 0s, 1s and 2s

  • Sort a linked list of 0s, 1s and 2s 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 Sort a linked list of 0s, 1s and 2s.
  • From the example next to this theory: Sort a linked list of 0s, 1s and 2s — 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 Sort a linked list of 0s, 1s and 2s? Then show head → next → …. Then name the trap.

Technical Interview Tip: What is Sort a linked list of 0s, 1s and 2s? Show this: head → next → …. Trap: losing the next pointer on delete.

Code Examples for Sort a linked list of 0s, 1s and 2s

Sort a linked list of 0s, 1s and 2s — 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

Sort a linked list of 0s, 1s and 2s — a linked list chains nodes with next pointers instead of contiguous indexes.

How to Explain Sort a linked list of 0s, 1s and 2s to an Interviewer

What is Sort a linked list of 0s, 1s and 2s?

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

Give one small example of Sort a linked list of 0s, 1s and 2s.

head → next → … Sort a linked list of 0s, 1s and 2s — a linked list chains nodes with next pointers instead of contiguous indexes

What mistake do beginners make with Sort a linked list of 0s, 1s and 2s?

losing the next pointer on delete Show the fix

Where do you use Sort a linked list of 0s, 1s and 2s?

a counter a ticket queue node