Counting Sort Algorithm — DSA Technical Interview Questions & Answers

Counting Sort Algorithm

Counting Sort Algorithm

  • Counting Sort Algorithm is a DSA topic. In plain words you use it for names A→Z in the roll list. Don’t start with a slogan — start with that picture.
  • Smallest example: n log n vs n². Type it, run it, and say what you see. If you can do that from memory, you know Counting Sort Algorithm.
  • From the example next to this theory: Counting Sort Algorithm: dry-run [4, 1, 3].
  • Trap: unstable sort when equal keys matter. Fix that before you talk about advanced DSA.
  • Viva: what is Counting Sort Algorithm? Then show n log n vs n². Then name the trap.

Technical Interview Tip: What is Counting Sort Algorithm? Show this: n log n vs n². Trap: unstable sort when equal keys matter.

Code Examples for Counting Sort Algorithm

Counting Sort Algorithm — working example

# Counting Sort Algorithm
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)

Counting Sort Algorithm: dry-run [4, 1, 3]. Say the list after one step.

How to Explain Counting Sort Algorithm to an Interviewer

What is Counting Sort Algorithm?

Used for names A→Z the roll list Not just the heading

Give one small example of Counting Sort Algorithm.

n log n vs n² Counting Sort Algorithm: dry-run [4, 1, 3]

What mistake do beginners make with Counting Sort Algorithm?

unstable sort when equal keys matter Show the fix

Where do you use Counting Sort Algorithm?

the roll list names A→Z