Sort numbers stored on different machines

Sort numbers stored on different machines 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 Sort numbers stored on different machines.

From the example next to this theory — Sort numbers stored on different machines: dry-run [4, 1, 3].

Trap — unstable sort when equal keys matter. Fix that before you talk about advanced DSA.

Viva — what is Sort numbers stored on different machines? Then show n log n vs n². Then name the trap.