I've noticed something very interesting in codeforces's testing system. When you copy someone's source code during the contest, your problem will get SKIPPED and you will not get any points, the contest will become unrated for you. I think it is not fair, because if you submitted a problem and it was not correct, you can just copy your friend's code and you will not lose any points. I think this should be fixed !!! MikeMirzayanov do you know about this? Is this possible to fix ?