The author of this answer mostly describes the performance of his solution, with a bit of hint about the implementation. He ends the answer with "Source codes are free upon request".
I think that this kind of answer is useless, since if the user moves on and doesn't visit SO anymore, the post becomes a sign post that points to nowhere. However, I expect the source code to be big enough that it is not fit to be included in the answer.
What can be done in this case?
(Please ignore the fact that the answer is a self-duplicated answer for a moment.)