Hello, Codeforces!

This Sunday there will be a Moscow Olympiad for Young Students. This contest is prepared by Moscow Olympiad Scientific Committee that you may know by Moscow Open Olympiad, Moscow Team Olympiad, Metropolises Olympiad and All-Russian olympiad in the name of Keldysh.

We are glad to invite you to Codeforces Round 1078 (Div. 2) based on the problems of this olympiad, which will take place on Feb/08/2026 12:05 (Moscow time). Note the unusual time of the round. The round will be held according to the Codeforces rules and will be rated for all participants with rating below 2100.

Problems of this competition were prepared by silvvasil, Semen07, allvik66, dope, teraqqq guided by TheEvilBird, grphil and Helen Andreeva.

Thanks to FairyWinx for the round coordination, and also thanks for MikeMirzayanov и KAN for Codeforces and Polygon platforms, which was used to prepare problems of this olympiad.

We also thank:

• t.ravnushkin, KiKoS, didedoshka, feblokas, makrav, blook, zhiganov_v, lewc, gmusya for testing the main Olympiad problems;

• __baozii__, _istil, ArSarapkin, fishy15, PvPro, madlogic, -firefly-, FelixArg for testing the round;

• RP-1, stepanov.aa for the preparing Olympiad problems that were not included in the round.

The scoring will be available later.

UPD: Scoring distribution: 500 — 1000 — 1750 — 2000 — 2500 — (1750 + 1750)

UPD: Since the round is based on an onsite olympiad, viewing other participants' submissions and upsolving will be available starting from 12:00 UTC

UPD: Until 13:00 UTC due technical reason

UPD: Editorial