Kattis is one of those popular competitive programming
sites, where people go to practice ICPC-style coding problems. I don’t use it
personally, but a while ago I found out they have a shortest code leaderboard.
The easiest problem on the site is called Hello World!,
where the task is simply to print Hello World! to STDOUT.
It seems straightforward at first, but if you check the leaderboards, the shortest submission to the problem is an astonishing
5 characters long (in Bash)! Common sense tells us that
Hello World! costs 12 characters alone, so this score should not be possible
from an entropy perspective…