Hello, Codeforces! We're glad to invite you to take part in Codeforces Round 980 (Div.1, Div. 2), which will start on Oct/20/2024 12:05 (Moscow time). Note the unusual time of the round. Each division will have 6 problems and 2 hours to solve them. The round will be held according to the Codeforces rules and will be rated for both divisions.

The problems were authored and prepared by Mangooste, Tikhon228, adepteXiao, Artyom123, sevlll777, yunetive29, glebustim, Endagorion, isaf27 guided by Ormlis and Helen Andreeva.

The round is based on XXII Moscow Team Olympiad, high school students competition based in Moscow that is an elimination contest for All-Russian Team Olympiad. Also thanks to the authors of the Olympiad whose problems were not included in the round : vaaven, TeaTime, pakhomovee, TheEvilBird, ch_egor.

We would like to thank specially:

• Artyom123 for his high-speed coordination.
• MikeMirzayanov for creating Codeforces and Polygon.

Great thanks to the testers: Kapt, SomethingNew, k1sara, Pekiban, automac, theRealChainman, marks39, cosenza, pengin_2000, Killever, perchuts, Endagorion, maomao90.

As well as the teams testing the main Olympiad: (RP-1, kostylevGO, PBBx0), (AgafonovArtem, blyat), (daubi, talant, alexxela12345), (tem_shett, crazyilian, sevlll777), (katyaporay, Igorbunov, Dart-Xeyter), Kirill22, (rama798, FlameDragon, egneeS), (MOHOXPOM, Goshix, shevnin_d), teraqqq, (Siberian, Um_nik), (kova1, Aleks5d), (makcvim, Silver_Fox), polosatic.

UPD1: Score distribution:

Div.2: 500 — 1000 — 1250 — 1750 — 2250 — 3000

Div.1: 500 — 1000 — 1500 — 2250 — 2750 — 3000

UPD2: Due to the official competition source codes of other participants will not be available for two hours after the end of the round.

UPD3: Editorial