Link to the write-up: http://psyho.gg/2015-challenge24-finals/
Sorry for making another blog on the same subject, but I already was a halfway through when ArtDitel posted his own. And, considering the amount of work I had put into it, I think it deserves its own post.
I went the hard way, and the write-up focuses on solving the actual problems, instead of bashing the organizers :)