Union and Intersection of two Linked Lists — DSA Technical Interview Questions & Answers

Union and Intersection of two Linked Lists

Union and Intersection of two Linked Lists

  • Union and Intersection of two Linked Lists 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 Union and Intersection of two Linked Lists.
  • From the example next to this theory: Union and Intersection of two Linked Lists: dry-run [4, 1, 3].
  • Trap: losing the next pointer on delete. Fix that before you talk about advanced DSA.
  • Viva: what is Union and Intersection of two Linked Lists? Then show head → next → …. Then name the trap.

Technical Interview Tip: What is Union and Intersection of two Linked Lists? Show this: head → next → …. Trap: losing the next pointer on delete.

Code Examples for Union and Intersection of two Linked Lists

Union and Intersection of two Linked Lists — working example

# Union and Intersection of two Linked Lists
data = [4, 1, 3]
print("start", data)
if data[0] > data[1]:
    data[0], data[1] = data[1], data[0]
print("after one step", data)

Union and Intersection of two Linked Lists: dry-run [4, 1, 3]. Say the list after one step.

How to Explain Union and Intersection of two Linked Lists to an Interviewer

What is Union and Intersection of two Linked Lists?

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

Give one small example of Union and Intersection of two Linked Lists.

head → next → … Union and Intersection of two Linked Lists: dry-run [4, 1, 3]

What mistake do beginners make with Union and Intersection of two Linked Lists?

losing the next pointer on delete Show the fix

Where do you use Union and Intersection of two Linked Lists?

a counter a ticket queue node