Hello, Codeforces!

It's been a long journey, and I'm finally pleased to invite you to participate in our Codeforces Round 955 (Div. 2, с призами от NEAR!), which will take place on 25.06.2024 17:35 (Московское время).

This round will be rated for all participants with a rating is below 2100. Participants with higher ratings can participate out of competition.

During the round, you will need to solve 6 problems. You will have 2 hours to solve them.

The problems for the round were prepared by nik1998, egor4444ik, iamdimonis and me.

We sincerely thank everyone who provided invaluable assistance in preparing this round:

• Our insightful coordinator 74TrAkToR for excellent communication, helpful advice and assistance in problem preparation!
• Kolychestiy for improving one of the problems.
• EJIC_B_KEDAX, A_G, zwezdinv, Dominater069, culver0412, TheScrasse for red testing.
• Kolychestiy, CSQ31, exhausted, azureglow, harsh__h, meowcneil for yellow testing.
• onlytrall, veleboks, zarubin, robotolev, TimVen74, Vladosiya for purple testing.
• Alenochka, LightSky, Chugunov_Alexander, slash0t, PoDuReMaN, katzi, Vamperox, redpanda for blue testing.
• Matrosk1n, bessarab, dariasaligina, GRIVA_, viteli, dazlersan1 for cyan testing.
• Kirillar2, Sonya_2009, dan00ile for green testing.
• venlesN for gray testing.
• MikeMirzayanov for the wonderful Codeforces and Polygon systems.

We are pleased to announce that NEAR has supported the round!

NEAR was founded in 2017 by Illia Polosukhin, one of the creators of Transformers, and Alex Skidanov as an attempt to build an artificial system capable of solving competitive programming problems. You can read more about that attempt here.

Ultimately, NEAR pivoted into building a blockchain protocol, which it launched in 2020.

This year, NEAR started NEAR.AI, a new lab with a mission to build AI systems that are open and available to everyone, instead of being controlled by a few mega-corporations.

One of the areas of focus is making models capable of reasoning reliably, and for that, competitive programming problems provide a great environment. To help us build it, we invite all the Russian-speaking members of the Codeforces community with a rating of Specialist or higher (1400+) to help us annotate step-by-step explanations of solutions to competitive programming problems. We want to annotate a very large set of problems of all difficulty levels, and pay relatively high rewards in NEAR per annotation. Don't speak Russian but speak English? Stay tuned here, we will be launching the same project for English-speaking people very soon, and will likely sponsor another round when it happens.

The round also features prizes in NEAR. Participants who rank in the top 16 will receive Ⓝ 16 each. The next 32 participants in the overall ranking (including unofficial participants) will receive Ⓝ 8 each. The following 64 participants will receive Ⓝ 4 each; the subsequent 128 participants will receive Ⓝ 2 each, and finally, the next 256 participants will receive Ⓝ 1 each.

Additionally, 64 random participants from the top 4096 in the overall ranking will each receive Ⓝ 4.

Score distribution: $$$500\,—\,1000\,—\,1000\,—\,1750\,—\,2500\,—\,3250$$$

Wishing everyone good luck and high ratings!

UPD: Let's continue the series of announcements with a photo of the authors :)