Hi, Codeforces!

Codeforces Round #524 (Div. 2) will be held on Nov/24/2018 10:35 (Moscow time). The round will be rated for the second division (rating is less than 2100). As usual, participants from the first division will be able to participate out of competition.

You will be given 6 problems and 2 hours and 15 minutes to solve them.

This round was prepared by me, arsijo, and stanislav.bezkorovainyi.

Thanks to Markellonchik, iSlava, and Barichek for testing, Jajceslav for pictures to the problems, and MikeMirzayanov for wonderful platforms Codeforces and Polygon.

The round is based on the II stage of Ukrainian Olympiad in Informatics, that is why please do not discuss the problems before the system testing start.

UPD: Scoring distribution: 500 — 750 — 1250 — 1750 — 2250 — 2500.

UPD2: Congratulations to the winners:

1. Qingzhi_chan
2. Laggay
3. H-C-H
4. lqs2015
5. Trrui

UPD3: Editorial.