Hello Codeforces!

I am pleased to invite you all to participate in Codeforces Round 981 (Div. 3), which will start on Oct/24/2024 17:35 (Moscow time).

The format of the event will be like any Div. 3 rounds:

• 6-8 tasks;

• ICPC rules with a penalty of 10 minutes for an incorrect submission;

• 12-hour phase of open hacks after the end of the round (hacks do not give additional points)

• after the end of the open hacking phase, all solutions will be tested on the updated set of tests, and the ratings recalculated

• by default, only "trusted" participants are shown in the results table.

I encourage participants with a rating of 1600+ not to create new accounts but to participate unofficially.

Only trusted participants of the third division will be included in the official standings table. This is a forced measure for combating unsporting behavior. To qualify as a trusted participant of the third division, you must:

• take part in at least five rated rounds (and solve at least one problem in each of them),
• do not have a point of 1900 or higher in the rating.

Regardless of whether you are a trusted participant of the third division or not, if your rating is less than 1600 (or you are a newcomer/unrated), then the round will be rated for you.

Also, it will be a round with unrated register. If you already registered as rated participant you can change registration type here.

I would like to thank

• MikeMirzayanov for creating Codeforces and Polygon.

• Vladosiya for beautiful coordination and helping in preparation.

• Pa_sha, SashaT9 and Skillful_Wanderer for not only testing but also discussion of the problems.

• Error_Yuan, Sokol080808, Hyperbolic, Irmuun.Ch, wuhudsm, LMeyling, amoeba3, chromate00, Intellegent, [user:Victor36,2024-10-23], Wandoka, 18o3, -1e11, adepteXiao, yellow_13, darysani, Parag_AP and Vinayak286 for testing and useful feedback.

• My friends cat Chefir who inspired one of the task statements

Good luck!