The round 1 of VK Cup 2017 will take place on March 18 at 18:35 MSK (check your timezone here), along with standard div1+2 Codeforces Round #405. The contest "VK Cup 2017 — Round 1" is for teams qualified from two Qualification Rounds. The top 400 teams will advance to the Round 2, while other ones will have one more chance in the Wild Card Round 1 in April. Those who don't participate in the VK Cup can take part in the Codeforces Round #405 individually (problems will be available in English too). All three rounds last 2 hours, and all are rated.
I'm a setter and I hope (and expect?) that you will enjoy the problems. During the contest, remember that you can read many problems and try to solve those that fit you most.
I wish you great fun and no frustrating bugs.
div1: 500-1000-1500- 2250 -2500
vk-cup: 250-500-1000-1500- 2250 -2500
The contest is over. See the editorial here. Congratulations to all who advanced to the next round, and congratulations to winners of each contest.
Specifically, the winners of VK Cup Round 1 are:
The winners of parallel rounds are:
I'm sorry for letting some slow solutions pass in the Rectangle Strips problem. I tried really hard to prepare tests there but apparently didn't succeed.