Hello, Codeforces!

IceSerpent and I are pleased to invite you to Codeforces Round 1085 (Div. 1 + Div. 2) on Mar/08/2026 17:35 (Moscow time)! While some of us will be turning our clocks an hour forward for daylight savings, our theme will turn it way back to the 2010s.

You will be given $$$8$$$ problems to solve in $$$3$$$ hours. Note that some of these problems are further divided into subtasks. Some of the problems may be interactive, so please read the guide for interactive problems if you are not familiar with them. The scoring distribution is as follows:

$$$\ \ \ \,$$$ $$$\ $$$ $$$\ \,$$$ $$$\,$$$ $$$\quad\ \ \ \ \,$$$ $$$\quad\ \ \ \ \ \,$$$ $$$\ \ $$$ $$$\qquad\ \ \ \ \ \ \ \,$$$ $$$\qquad\quad\ \ \ \ \ \ \ \ $$$

The problems of this round were authored by IceSerpent and myself, awang11. In addition, we would like to thank:

• 244mhq for his excellent coordination of the round and translating the problems to Russian;

• Um_nik for pre-reviewing the round;

• flummoxedfeline for providing beautiful illustrations;

• our army of testers, for their invaluable feedback and eagerness to testsolve: Um_nik, shcal, awesomeguy856, Extile, Noobish_Monk, __baozii__, Amazed, SomethingNew, awoo, -firefly-, ink31930, nik_exists, chromate00, cduckling, madlogic, Hori, misteg168, Dominater069;

• and of course MikeMirzayanov and KAN for the Codeforces and Polygon platforms.

UPD 1: The scoring distribution has been released!