First: We apologize for any inconvenience caused. On the second day, we'll try to correct all today's mistakes.
We still hope that you enjoyed the contest.
You can upsolve here
Let's discuss the problems.
Upd: Day 1 unofficial results here
Upd: Day 1+2 unofficial results here
Upd: Day 2 now available to upsolving.
Upd: Editorials.