Today, in lots of contests, hacks are unrespected. There are no hacks in 90% of div1 round. However, find someone's mistake is a nice skill. I suggest a hacker contest. 1. There is no score for the problem, only for hacks. 2. You are allowed to copy someone's codes into local. 3. 2 hour solving and 12-hour hacking, like educational codeforces. 4. No pretests except samples, and no systest either. The only real test would be from hacks. 5. Score is 100*successful hack-50*unsuccessful hack. Of course, the contest should be unrated, because it is hackforces, not codeforces.