three possibilites:
1) we provided (auto-)disqualification, hence the author can disq his own solution
2) we provide a check-box - "not included in ranking" (but the submissions will affect on other points) (is it good idea? any suggestions?)
3) we can ban the user
after we provide (2) - we will warn cheaters (in global news) and explain in details the rules,
after week or two - we start to ban all cheaters - pointed out by community... (esp. EB team)
any suggestions are welcome