During the past few days, we have done some internal optimizations (thanks, kuviman). Before the start of Codeforces Global Round 3, I want to be absolutely sure that everything works correctly. I ask you to help us to test the system. Please, take part in Testing Round 15 (Unrated). It is unrated, contains 1-2 easy well-known problems. The pretests will be extremely weak to increase the number of hacks. Thanks!
UPD: It seems everything works great. Thanks!
The first time they make it unrated before the contest because of weak pretests, hats off for you Mike!
Since It was unrated and Testing round. You should have allowed registration till the end.
I wanted to make 50 hacks in the round but when I got to know about this round it was too late. :(