I was going through https://a2oj.com/ codeforces ladders, and I noticed something strange. As I submitted problems in the problem set, I had to wait a bit before I would get a verdict. However, when I opened the contest for the problem, the submission ran super quick. The difference was around 3 seconds versus 30 seconds. Does joining empty/inactive contests give your problem judging priority? Or is it that the problem set queue is really slow? Let's discuss.