As I wrote into a comment, last round we are faced a strong DDOS-attack which ruined the competition. I don't know who did it, I also don't know reasons to do it. I'm very upset about the situation and ready to make effort to be prepared for such issues.
I spend a lot of time to be ready for such incidents.
Here are steps you need to do to be ready for unexpected failures:
- Join our telegram channel by the link https://t.me/codeforces_official to read urgent news.
- Be sure that you know the password of your Codeforces account. If you don't remember it, just use the password recovery feature. Please, do it right now.
- I've implemented a minimalistic website for replacing the main site in case of emergencies. Now you can only read problems, view you submissions (without any details), submit codes. Probably, later I'll add some more features, but anyway the minimalistic version will have only vital features to take part in a contest. I've deployed it in several places, you can visit any of them by the links: http://m1.codeforces.com, http://m2.codeforces.com, http://m3.codeforces.com. If any of them is unavailable, just use another. Do not use them if the main website is alive.