Hi Codeforces!

I'm glad to introduce you to Codeforces Round 558 (Div. 2), which will take place on May/09/2019 18:05 (Moscow time).

You will have 6 problems and 2 hours to solve them. Round will be rated for everyone with rating below 2100. Participants from the first division can also participate out of competition as usual.

The problems were prepared by me, ArguteOnAir, Shirone, and GreymaneSilverfang. I would like to thank cdkrot for his immense help during the round preparation, 300iq, mohammedehab2002, and Um_nik for testing them, and of course MikeMirzayanov for the Codeforces and Polygon platforms.

In the contest, you will meet Kuro, Shiro, Katie, and Selena, the four naughty but smart cats who love playing and asking questions. I hope you will find our problems interesting.

Good luck!