999_999_999

The puzzle came first:

The answer followed:

Don’t click on the answer if you don’t want it spoiled. You have been warned.

I don’t believe that posting the answer ruins anything. Nobody else can claim this as their own because they would still have to explain how they achieved this result.

Believe me when I say that I can go into excruciating details.

Also, in my case, it was an excellent way to practice Erlang. Nothing beats solving a “real” problem to imprint a programming language in your head.