Thanks for the participation!

1649A - Game was authored by Jeffrey and prepared by DmitryGrigorev

1649B - Game of Ball Passing was authored by low_ and prepared by low_ and DmitryGrigorev

1648A - Weird Sum was authored and prepared by cookiedoth

1648B - Integral Array was authored by grphil and prepared by shishyando

1648C - Tyler and Strings was authored and prepared by Tikhon228

1648D - Serious Business was authored and prepared by ligaydima

1648E - Air Reform was authored and prepared by grphil

1648F - Two Avenues was authored by I_love_myself and prepared by isaf27

Hello!

Right now happens the first tour of the Open Olympiad in Informatics, and tomorrow will be the second one. This contest is prepared by Moscow Olympiad Scientific Committee that you may know by Moscow Team Olympiad, Moscow Olympiad for Young Students and Metropolises Olympiad (rounds 327, 342, 345, 376, 401, 433, 441, 466, 469, 507, 516, 541, 545, 567, 583, 594, 622, 626, 657, 680, 704, 707, 727, 751).

Open Olympiad consists of the most interesting and hard problems that are proposed by a wide community of authors, so we decided to conduct a Codeforces regular round based on it, which will happen on Mar/06/2022 12:55 (Moscow time) and will be based on both days of the Olympiad. Each division will have 6 problems and 2 hours to solve them.

We kindly ask all the community members that are going to participate in the competition to show sportsmanship by not trying to cheat in any manner, in particular, by trying to figure out problem statements from the onsite participants. If you end up knowing some of the problems of Moscow Open Olympiad (by participating in it, from some of the onsite contestants or in any other way), please do not participate in the round. We also ask onsite contestants to not discuss problems in public. Failure to comply with any of the rules above may result in a disqualification.

Problems of this competition were prepared by cookiedoth, shishyando, gmusya, Tikhon228, ligaydima, Siberian, isaf27, I_love_myself, _tryhard, KiKoS, _overrated_ guided by cdkrot, vintage_Vlad_Makeev, GlebsHP, Zlobober, meshanya, ch_egor, grphil, voidmax, fedoseev.timofey, Endagorion and Helen Andreeva.

Thanks to DmitryGrigorev and KAN for the round coordination, statement translation and preparation of problems for the second division, and also thanks for MikeMirzayanov for systems Codeforces and Polygon, which was used to prepare problems of this olympiad.

Also thanks to low_ and Jeffrey for providing an additional problems that helped to create (I hope) a balanced problem set for the round.

Good luck everybody!

Due to the official competition source codes of other participants will not be available for an hour after the end of the round.

UPD1: Winners!

Div. 1:

1. jiangly
2. ABitstOCHASTIC
3. maroonrk
4. 137_345_2814
5. Elegia

Div. 2:

1. AC464
2. Nephry
3. andyzys
4. Let_Us_Rebegin
5. _JacderZhang_

UPD2: Editorial

Hi everybody,

This Sunday there will be a XIX Moscow Team Olympiad, high school students competition based in Moscow that is an elimination contest for All-Russian Team Olympiad. This contest is prepared by Moscow Olympiad Scientific Committee that you may know by Moscow Open Olympiad, Moscow Olympiad for Young Students and Metropolises Olympiad (rounds 327, 342, 345, 376, 401, 433, 441, 466, 469, 507, 516, 541, 545, 567, 583, 594, 622, 626, 657, 680, 704, 707, 727).

The round will be held at Oct/25/2021 09:35 (Moscow time) and will last for 2 hours. Note the unusual time of the round. Each division will have 6 problems. The round will be held according to the Codeforces rules and will be rated for both divisions.

We kindly ask all the community members that are going to participate in the competition to show sportsmanship by not trying to cheat in any manner, in particular, by trying to figure out problem statements from the onsite participants. If you end up knowing some of the problems of Moscow Team Olympiad (by participating in it, from some of the onsite contestants or in any other way), please do not participate in the round. We also ask onsite contestants to not discuss problems in public. Failure to comply with any of the rules above may result in a disqualification.

Problems are prepared by LHiC, cdkrot, isaf27, AlesyaIvanova, Tikhon228, voidmax, fedoseev.timofey, KiKoS, NiceClock, 4eT_llpuyHblJl, vintage_Vlad_Makeev and Daria Krokhina under my supervision with great help of GlebsHP, meshanya, Endagorion, Zlobober and Helen Andreeva.

Thanks to adedalic and KAN for the round coordination and verifying statement of original olympiad, adedalic and GlebsHP for statement translation, and also thanks for MikeMirzayanov for systems codeforces and polygon, which was used to prepare problems of this olympiad.

Also thanks to napstablook and Anti-Light for providing an additional problems that helped to create (I hope) a balanced problem set for the round

Good luck everybody!

UPD1: Thanks to Um_nik, PurpleCrayon, LHiC, VladaMG98, JovanB, TadijaSebez, AlanSkarica, Markadiusz, actinium16, jurichhh8 for testing.

UPD2: Scoring distribution:

Div.1: 500 — 1250 — 2000 — 2250 — 2250 — 3000

Div.2: 500 — 1000 — 1500 — 2250 — 3000 — 3250

UPD3: Editorial

UPD4: Winners!

Div. 1:

1. djq_cpp
2. ksun48
3. maroonrk
4. ko_osaga
5. Radewoosh

Div. 2:

1. zero4338
2. C2020jzm
3. SYDevil
4. PPL_
5. just_ice

Thanks for the participation!

1602A - Two Subsequences was authored and prepared by napstablook

1602B - Divine Array was authored and prepared by Anti-Light

1601A - Array Elimination was authored and prepared by isaf27

1601B - Frog Traveler was authored and prepared by KiKoS

1601C - Optimal Insertion was authored and prepared by isaf27

1601D - Difficult Mountain was authored and prepared by Tikhon228

1601E - Phys Ed Online was authored by jury and prepared by fedoseev.timofey

1601F - Two Sorts was authored by cdkrot and prepared by cdkrot, LHiC

Thanks for the participation!

1539A - Contest Start was authored and prepared by grphil

1539B - Love Song was authored by jury and prepared by _tryhard

1539C - Stable Groups was authored by Artyom123 and prepared by Artyom123 and shishyando

1539D - PriceFixed was authored by Helen Andreeva and prepared by Siberian

1539E - Game with Cards was authored and prepared by TeaTime

1539F - Strange Array was authored and prepared by Tikhon228

Hi!

This Sunday will take place All-Russian olympiad for students of 5-8 grades, in the name of Keldysh. Good luck to all the participants! Olympiad is conducted under the guidance of the Moscow Olympiad Scientific Committee, in particular GlebsHP, ch_egor, Endagorion, vintage_Vlad_Makeev, Zlobober, meshanya, cdkrot, voidmax, grphil and, of course, Helen Andreeva.

We are happy to announce the Codeforces Round #727 based on the problems of this olympiad! It will be a Div. 2 round, which will take place at Jun/20/2021 13:05 (Moscow time). You might have already participated in rounds based on the school olympiads, prepared by Moscow Olympiad Scientific Committee (rounds 327, 342, 345, 376, 401, 433, 441, 466, 469, 507, 516, 541, 545, 567, 583, 594, 622, 626, 657, 680, 704, 707).

The problems of this olympiad were prepared by _tryhard, Siberian, shishyando, Artyom123, TeaTime, Tikhon228 under the supervision of grphil.

Thanks to KAN, Aleks5d and isaf27 for their help in organizing the Codeforces version of this contest and MikeMirzayanov for the Codeforces and Polygon.

Also I would like to thank the Tinkoff company and personally Tatyana TKolinkova Kolinkova for great help with organizing the competition.

Good luck!

UPD1: Thanks to _overrated_ and Ormlis for testing.

UPD2: Scoring distribution: 500 — 750 — 1250 — 1500 — 2000 — 2500

UPD3: Editorial

UPD4: Winners!

Div. 2:

1. MiyoHijiriido
2. newbiewzs
3. tou_xue
4. SoilCrystal
5. EEIEE

Div. 1 + Div. 2:

1. Maksim1744
2. kal013
3. jiangly
4. LayCurse
5. 2qbingxuan

Thanks for the participation!

1501A - Alexey and Train was authored by Aleks5d and prepared by 4qqqq

1501B - Napoleon Cake was authored and prepared by KAN

1500A - Going Home was authored and prepared by wrg0ababd

1500B - Two chandeliers was authored by jury and prepared by Siberian

1500C - Matrix Sorting was authored by Endagorion and prepared by NiceClock

1500D - Tiles for Bathroom was authored by meshanya and prepared by KiKoS

1500E - Subset Trick was authored and prepared by isaf27

1500F - Cupboards Jumps was authored and prepared by Akulyat

Hello!

Right now happens the first tour of the Open Olympiad in Informatics, and tomorrow will be the second one. This contest is prepared by Moscow Olympiad Scientific Committee that you may know by Moscow Team Olympiad, Moscow Olympiad for Young Students and Metropolises Olympiad (rounds 327, 342, 345, 376, 401, 433, 441, 466, 469, 507, 516, 541, 545, 567, 583, 594, 622, 626, 657, 680, 704).

Open Olympiad consists of the most interesting and hard problems that are proposed by a wide community of authors, so we decided to conduct a Codeforces regular round based on it, which will happen on Mar/13/2021 12:05 (Moscow time) and will be based on both days of the Olympiad. Each division will have 6 problems and 2 and a half hours to solve them.

We kindly ask all the community members that are going to participate in the competition to show sportsmanship by not trying to cheat in any manner, in particular, by trying to figure out problem statements from the onsite participants. If you end up knowing some of the problems of Moscow Open Olympiad (by participating in it, from some of the onsite contestants or in any other way), please do not participate in the round. We also ask onsite contestants to not discuss problems in public. Failure to comply with any of the rules above may result in a disqualification.

Problems of this competition were prepared by Akulyat, KiKoS, wrg0ababd, Nebuchadnezzar, creep, alexX512 isaf27, ismagilov.code, DebNatkh, Siberian, NiceClock guided by cdkrot, vintage_Vlad_Makeev, GlebsHP, Zlobober, meshanya, ch_egor, grphil, voidmax, Endagorion and Helen Andreeva.

Thanks to adedalic and KAN for the round coordination, statement translation and preparation of problems for the second division, and also thanks for MikeMirzayanov for systems Codeforces and Polygon, which was used to prepare problems of this olympiad.

Also thanks to 4qqqq and Aleks5d for providing an additional problems that helped to create (I hope) a balanced problem set for the round, and Um_nik for testing!

Good luck everybody!

Due to the official competition source codes of other participants will not be available for an hour after the end of the round.

UPD1:

Please do not discuss problems publicly until 12:30 UTC.

The scoring distribution for both divisions is not standard:

• div1: 750 — 750 — 1500 — 2000 — 2500 — 3000
• div2: 500 — 1000 — 1750 — 1750 — 2500 — 3000

UPD2: Editorial

UPD3: Winners!

Div. 1:

1. tourist
2. jiangly
3. maroonrk
4. ecnerwala
5. slime

Div. 2:

1. 20I6wudi
2. ShimaRin
3. fengqiyuka
4. gezlik
5. b___

Hi everybody,

This Tuesday there will be a Moscow programming competition for school students of grades from 6 to 9. This contest is prepared by Moscow Olympiad Scientific Committee that you may know by Moscow Open Olympiad, Moscow Team Olympiad and Metropolises Olympiad (rounds 327, 342, 345, 376, 401, 433, 441, 466, 469, 507, 516, 541, 545, 567, 583, 594, 622, 626, 657, 680).

Round will be held at Feb/23/2021 12:05 (Moscow time). You will be given 5 problems and 2 hours to solve them. Round will be rated for second division (rating below 2100). As usual, participants from the first division can participate in a contest out of competition.

Problems are prepared by grphil, Jatana, rip, Sehnsucht, DebNatkh, KiKoS, wrg0ababd, V--o_o--V, voidmax, meshanya, vintage_Vlad_Makeev under my supervision.

Thanks to adedalic for the round coordination, cdkrot and meshanya for statement translation, and also thanks for MikeMirzayanov for systems Codeforces and Polygon, which was used to prepare problems of this olympiad.

Also thanks to Noam527 for providing an additional problem that helped to create (I hope) a balanced problem set for the round.

Good luck everybody!

Due to the official competition source codes of other participants will not be available for an hour after the end of the round.

UPD1: Thanks to LHiC, awoo, ScarletS, adarsh7777, kassutta, raj_mehta_ for testing.

UPD2:

Scoring distribution: 500 — 1000 — 1500 — 2250 — 3000

UPD3: Editorial

UPD4: Winners!

Div. 2:

1. InternetPerson10
2. egor95123657
3. hhhyyyfff
4. xXx_KevinDu58_xXx
5. Flying2021

Div. 1 + Div. 2:

1. Um_nik
2. qazswedx2
3. 3.141592653
4. BigBag
5. InternetPerson10

Thanks for the participation!

1492A - Three swimmers was authored by meshanya and prepared by ch_egor

1492B - Card Deck was authored by Noam527 and prepared by ch_egor, adedalic

1492C - Maximum width was authored and prepared by Jatana

1492D - Genius's Gambit was authored by voidmax and prepared by rip

1492E - Almost Fault-Tolerant Database was authored by wrg0ababd and prepared by Sehnsucht

Thanks for the participation!

1445A - Array Rearrangment was authored by meshanya and prepared by ch_egor

1445B - Elimination was authored by Helen Andreeva and prepared by ismagilov.code

1444A - Division was authored by vintage_Vlad_Makeev and prepared by grphil

1444B - Divide and Sum was authored and prepared by NiceClock

1444C - Team-Building was authored by V--o_o--V and prepared by wrg0ababd

1444D - Rectangular Polyline was authored by Zlobober and prepared by DebNatkh

1444E - Finding the Vertex was authored by V--o_o--V and prepared by 300iq

Hi everybody,

This Sunday there will be a XVIII Moscow Team Olympiad, high school students competition based in Moscow that is an elimination contest for All-Russian Team Olympiad. This contest is prepared by Moscow Olympiad Scientific Committee that you may know by Moscow Open Olympiad, Moscow Olympiad for Young Students and Metropolises Olympiad (rounds 327, 342, 345, 376, 401, 433, 441, 466, 469, 507, 516, 541, 545, 567, 583, 594, 622, 626, 657).

The round will be held at Nov/01/2020 14:05 (Moscow time) and will last for 2 hours. Each division will have 5-6 problems. The round will be held according to the Codeforces rules and will be rated for both divisions.

Problems are prepared by vintage_Vlad_Makeev, NiceClock, ismagilov.code, vintage_Vlad_Makeev, KiKoS, wrg0ababd, ch_egor, Roms, voidmax, DebNatkh, Nebuchadnezzar, Endagorion, craborac, 300iq, cdkrot, LHiC, vintage_Vlad_Makeev, V--o_o--V, grphil under my supervision with great help of GlebsHP, meshanya, Endagorion, Zlobober and Helen Andreeva.

Thanks to adedalic and KAN for the round coordination and verifying statement of original olympiad, meshanya and cdkrot for statement translation, and also thanks for MikeMirzayanov for systems codeforces and polygon, which was used to prepare problems of this olympiad.

Good luck everybody!

UPD1: Thanks to Um_nik, satashun, mraron, ustze, Karavaiev, KKiYeer for testing.

UPD2: Scoring distribution:

Div.1: 500 — 1000 — 1500 — 2000 — 3000

Div.2: 500 — 1000 — 1500 — 2000 — 2500

UPD3: Editorial

UPD4: Winners!

Div. 1:

1. hos.lyric
2. Benq
3. ksun48
4. Isonan
5. jiangly

Div. 2:

1. JENXLS
2. God_Of_Blunder
3. jiazp
4. c2020HXW
5. Aishiteru.

Thanks for the participation!

1379A - Acacius and String was authored by ch_egor, meshanya and prepared by ch_egor, vintage_Vlad_Makeev

1379B - Dubious Cyrpto was authored by jury and prepared by DebNatkh

1379C - Choosing flowers was authored and prepared by grphil

1379D - New Passenger Trams was authored by Helen Andreeva and prepared by KiKoS

1379E - Inverse Genealogy was authored and prepared by voidmax and I_love_myself

1379F2 - Chess Strikes Back (hard version) was authored by 300iq and prepared by isaf27

#include <bits/stdc++.h>

using ll = long long;
using ld = long double;
using ull = unsigned long long;

using namespace std;

const string T = "abacaba";

int count(const string& s) {
    int cnt = 0;
    for (int i = 0; i < (int)s.size(); ++i) {
        if (s.substr(i, T.size()) == T) {
            ++cnt;
        }
    }

    return cnt;
}

int main() {
    ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
    int t;
    cin >> t;
    for (int tt = 1; tt <= t; ++tt) {
        int n;
        cin >> n;
        string s;
        cin >> s;
        bool F = false;

        for (int i = 0; i + T.size() <= n; ++i) {
            string ss = s;
            bool ok = true;
            for (int j = 0; j < T.size(); j++) {
                if (ss[i + j] != '?' && ss[i + j] != T[j]) {
                    ok = false;
                    break;
                }
                ss[i + j] = T[j];
            }
            if (ok && count(ss) == 1) {
                for (int j = 0; j < n; j++) {
                    if (ss[j] == '?') {
                        ss[j] = 'd';
                    }
                }
                F = true;
                cout << "Yes\n";
                cout << ss << "\n";
                break;
            }
        }
        if (!F) {
            cout << "No\n";
        }
    }

    return 0;
}

Hi!

This Sunday will take place All-Russian olympiad for students of 5-8 grades, in the name of Keldysh. Good luck to all the participants! Olympiad is conducted under the guidance of the Moscow Olympiad Scientific Committee, in particular GlebsHP, ch_egor, Endagorion, vintage_Vlad_Makeev, Zlobober, meshanya, cdkrot, voidmax, grphil and, of course, Helen Andreeva.

We are happy to announce the Codeforces Round #657 (Vintage Codeforces Round #3) based on the problems of this olympiad! It will be a Div. 2 round, which will take place at Jul/19/2020 12:00 (Moscow time). You might have already participated in rounds based on the school olympiads, prepared by Moscow Olympiad Scientific Committee (rounds 327, 342, 345, 376, 401, 433, 441, 466, 469, 507, 516, 541, 545, 567, 583, 594, 622, 626) as well as vintage rounds (rounds 626 and 628).

The problems of this olympiad were prepared by DebNatkh, grphil, KiKoS, voidmax, I_love_myself, 300iq, isaf27 under the supervision of grphil.

Thanks ch_egor, vintage_Vlad_Makeev and meshanya for their help in organizing the Codeforces version of this contest and MikeMirzayanov for the Codeforces and Polygon.

Also I would like to thank the Tinkoff company and personally Tatyana TKolinkova Kolinkova for great help with organizing the competition.

Good luck!

UPD1: Scoring distribution: 500 — 750 — 1250 — 1500 — 2500 — (1500 + 1500)

UPD2: Editorial

UPD3: Winners!

Div. 2:

1. imachug
2. yjw0203
3. kaixinqi
4. penguinman
5. Frikkie

Div. 1 + Div. 2:

1. antontrygubO_o
2. risujiroh
3. tmwilliamlin168
4. sansen
5. LayCurse

Thanks for the participation!

1323A - Even Subset Sum Problem was authored and prepared by vintage_Vlad_Makeev

1323B - Count Subrectangles was authored and prepared by vintage_Vlad_Makeev

1322A - Unusual Competitions was authored by vintage_Vlad_Makeev and prepared by DebNatkh

1322B - Present was authored by meshanya and prepared by wrg0ababd

1322C - Instant Noodles was authored by vintage_Vlad_Makeev and prepared by ch_egor

1322D - Reality Show was authored by voidmax and prepared by okwedook

1322E - Median Mountain Range was authored by Sender and prepared by grphil

1322F - Assigning Fares was authored by mingaleg, vintage_Vlad_Makeev and prepared by KiKoS

#include <bits/stdc++.h>

using ll = long long;
using ld = long double;
using ull = unsigned long long;

using namespace std;

vector<ll> gao(vector<int> a) {
    int n = a.size();
    vector<ll> res(n + 1);
    int i = 0;
    while (i < n) {
        if (a[i] == 0) {
            i++;
            continue;
        }

        int j = i;
        while (j < n && a[j] == 1) {
            j++;
        }
        for (int len = 1; len <= j - i; len++) {
            res[len] += j - i - len + 1;
        }
        i = j;
    }

    return res;
}

int main() {
    ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
    int n, m;
    ll k;
    cin >> n >> m >> k;
    vector<int> a(n);
    vector<int> b(m);
    for (int& x : a) {
        cin >> x;
    }
    for (int& x : b) {
        cin >> x;
    }

    ll ans = 0;

    auto ga = gao(a);
    auto gb = gao(b);
    for (int i = 1; i < ga.size(); i++) {
        if (k % i == 0 && k / i <= m) {
            ans += ga[i] * gb[k / i];
        }
    }

    cout << ans << "\n";
    return 0;
}

Thanks for the participation!

1313A - Fast Food Restaurant was authored by Endagorion and prepared by ch_egor

1313B - Different Rules was authored by meshanya and prepared by DebNatkh

1313C2 - Skyscrapers (hard version) was authored by meshanya and prepared by Sehnsucht

1313D - Happy New Year was authored and prepared by voidmax

1313E - Concatenation with intersection was authored and prepared by isaf27

Hi everybody,

This Sunday there will be a Moscow programming competition for school students of grades from 6 to 9. This contest is prepared by Moscow Olympiad Scientific Committee that you may know by Moscow Open Olympiad, Moscow Team Olympiad and Metropolises Olympiad (rounds 327, 342, 345, 376, 401, 433, 441, 466, 469, 507, 516, 541, 545, 567, 583, 594).

Round will be held at Feb/23/2020 12:05 (Moscow time). You will be given 5 problems and 2 hours to solve them. Round will be rated for second division (rating below 2100). As usual, participants from the first division can participate in a contest out of competition.

Problems are prepared by KiKoS, DebNatkh, grphil, Sehnsucht, voidmax, isaf27 under my supervision.

Thanks to cdkrot for the round coordination and statement translation, and also thanks for MikeMirzayanov for systems Codeforces and Polygon, which was used to prepare problems of this olympiad.

Good luck everybody!

UPD1:

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

Due to the official competition source codes of other participants will not be available for an hour after the end of the round.

UPD2: Winners!

Div. 2:

1. SARS-CoV-2
2. kvk1920
3. Crazy_Diamond
4. KwanghyunOn
5. pufanyi

Div. 1 + Div. 2:

1. amnesiac_dusk
2. jiangly
3. SARS-CoV-2
4. wiwitrifai
5. cookiedoth

UPD3: Editorial

Thanks for the participation!

1248A - Integer Points was authored by voidmax and prepared by vintage_Vlad_Makeev.

1248B - Grow The Tree was authored by voidmax, cdkrot and prepared by wrg0ababd.

1239A - Ivan the Fool and the Probability Theory was authored and prepared by voidmax.

1239B - The World Is Just a Programming Task (Hard Version) was authored by vintage_Vlad_Makeev and prepared by DebNatkh.

1239C - Queue in the Train was authored by meshanya and prepared by Sehnsucht.

1239D - Catowice City was authored by platypus179 and prepared by Nebuchadnezzar.

1239E - Turtle was authored by voidmax and prepared by cdkrot.

1239F - Swiper, no swiping! was authored and prepared by voidmax.

Hi everybody,

This Sunday there will be a XVII Moscow Team Olympiad, high school students competition based in Moscow that is an elimination contest for All-Russian Team Olympiad. This contest is prepared by Moscow Olympiad Scientific Committee that you may know by Moscow Open Olympiad, Moscow Olympiad for Young Students and Metropolises Olympiad (rounds 327, 342, 345, 376, 401, 433, 441, 466, 469, 507, 516, 541, 545, 567, 583).

Round will be held at Oct/20/2019 12:05 (Moscow time) and will last for 2 hours. Each division will have 6 problems.

Problems are prepared by wrg0ababd, vintage_Vlad_Makeev, DebNatkh, grphil, voidmax, vintage_Vlad_Makeev, volcolac, Sehnsucht, isaf27, cdkrot, Flyrise, Nebuchadnezzar, platypus179, Endagorion under my supervision with great help of GlebsHP, meshanya, Endagorion, Zlobober and Helen Andreeva.

Thanks to cdkrot for the round coordination and statement translation, and also thanks for MikeMirzayanov for systems codeforces and polygon, which was used to prepare problems of this olympiad.

Good luck everybody!

UPD1: Winners!

Div. 1:

1. TLEwpdus
2. rhrnald
3. ainta
4. dorijanlendvaj
5. MiracleFaFa
6. maroonrk
7. djq_cpp
8. kort0n
9. Marcin_smu
10. 300iq

Div. 2:

1. lolkekaidarbek
2. qdd
3. mathusalen
4. conan1412yang99
5. fauzdar65
6. DeepThought42
7. mikeleven
8. AnnieCai
9. liuandi6
10. jyf111

Editorial will be published soon.

UPD2: Editorial

Thanks for the participation!

1214A - Оптимальный обмен валюты was authored and prepared by Helen Andreeva.

1214B - Бейджи was authored by jury and prepared by Chmel_Tolstiy.

1214C - Плохая последовательность was authored by meshanya and prepared by GoToCoding.

1214D - Остров Сокровищ was authored by meshanya and prepared by malcolm.

1214E - Петя и конструктор was authored and prepared by voidmax.

1214F - Трудоустройство was authored and prepared by grphil.

1214G - Хорошее настроение was authored and prepared by isaf27.

1214H - Укладывание плитки was authored and prepared by cdkrot.

Hi everybody!

These days Moscow is conducting the 4th International Olympiad of Metropolises that is an international competition for high school students from biggest cities and capitals all around the world. One of the disciplines of the competition is informatics. Rounds of the competition were prepared by the jury members invited from St. Petersburg, Minsk, Belgrade and Moscow olympiad scientific committee which you may know by Moscow team Olympiad, Open Olympiad in Informatics and Moscow Olympiad for young students (rounds 327, 342, 345, 376, 401, 433, 441, 466, 469, 507, 516, 541, 545, 567).

Scientific Committee of the olympiad consists of: Chmel_Tolstiy, Jelena Hadži-Purić, Elena Andreeva, Zlobober, GlebsHP, andrewzta, meshanya.

The problems were developed by isaf27, cdkrot, manoprenko, GoToCoding, ch_egor, vintage_Vlad_Makeev, voidmax, grphil, malcolm under the guidance of GlebsHP and Zlobober.

Problems were adapted for codeforces by vintage_Vlad_Makeev and cdkrot, also thanks for MikeMirzayanov for systems codeforces and polygon, which was used to prepare problems of this olympiad. Also, thanks LHiC, voidmax and wrg0ababd for testing!

Good luck and high ratings for everybody!

Round will happen on Sep/04/2019 12:05 (Moscow time) and will last for two and half hours.

The round will consist of 8 problems and will be combined for both divisions. The round is rated for all participants.

P.S. We kindly ask everybody who knows problems of an onsite event not to participate in a round and not to discuss them in public, as this may be a subject for disqualification.

UPD1: Winners!

1. MiracleFaFa
2. gina0605
3. never_giveup
4. Radewoosh
5. mhq
6. cz_yixuanxu
7. ko_osaga
8. mango_lassi
9. GoForIt
10. ksun48

Editorial will be published soon.

UPD2: Editorial

(Developing and idea — vintage_Vlad_Makeev)

(Developing and idea — MikeMirzayanov)

(Developing — cdkrot, idea — jury)

(Developing — Sehnsucht, idea — Helen Andreeva)

(Developing and idea — VFeafanov)

(Developing and idea — Sender)

(Developing and idea — voidmax)

Hi everybody,

This Sunday there will be a Moscow programming competition for school students of grades from 6 to 9. This contest is prepared by Moscow Olympiad Scientific Committee that you may know by Moscow Open Olympiad, Moscow Team Olympiad and Metropolises Olympiad (rounds 327, 342, 345, 376, 401, 433, 441, 466, 469, 507, 516).

Round will be held at 10:05 UTC on Saturday. You will be given 6 problems and 2 hours to solve them. Round will be rated for second division (rating below 2100). As usual, participants from the first division can participate in a contest out of competition.

Problems are prepared by vintage_Vlad_Makeev, grphil, cdkrot, VFeafanov, Sehnsucht, Sender, voidmax under my supervision.

Thanks to cdkrot for the round coordination and statement translation, and also thanks for MikeMirzayanov for systems Codeforces and Polygon, which was used to prepare problems of this olympiad.

Good luck everybody!

UPD1: Due to some last-minute changes, there will be 7 problems.

UPD2: Winners!

Div 2:

1. Big_gold_date

2. PinkieRabbit

3. disposrestfuIIy

4. Dobrobober

5. szh0808

6. prodakcin

7. Argentina

8. afedor

9. bigelephant29

10. Young25

Div.1 + Div.2:

1. JustasK

2. BigBag

3. Egor.Lifar

4. Big_gold_date

5. waynetuinfor

6. dreamoon_love_AA

7. danya090699

8. KrK

9. Farhod_Farmon

10. PinkieRabbit

UPD3: Editorial