Hi everyone!
Today, our university had our secondary team selection round. All problems are prepared by me.
Special thanks to Tobo, Duck_sajin, Kyooma, zbceyond, Hile_Meow, gongkoufadongji, Joler_ and jiubei for testing.
The contest is now uploaded to the Codeforces gym at [contest:https://mirror.codeforces.com/gym/104886].
I hope you can enjoy the problems!