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1 X-Camp 402H 2022 Fall View all → → Find user Handle: → Recent actions Vladosiya → Codeforces Round 950 (Div. 3) New comment(s) iNNNo → Codeforces Round 951 (Div. 2) Editorial New comment(s) dorjderem → Anyone who comments under this post has to reach CM by September if can't.... New comment(s) mesanu → Codeforces Round #898 (Div. 4) Editorial New comment(s) adamjamil → Jobs for competitive programmers: Reflection New comment(s) Necropost Vladosiya → Codeforces Round 950 (Div. 3) Editorial New comment(s) iNNNo → Codeforces Round 951 (Div. 2) New comment(s) vovuh → Codeforces Round #544 (Div. 3) Editorial New comment(s) Necropost stefdasca → Click here if you want to know your future CF rating [Part 2] New comment(s) FedeNQ → Teams going to ICPC WF 2024 (Kazakhstan 2024) — WIP List Text created or updated amin_2008 → EGOI 2024 Teams Text created or updated Um_nik → How to read problem statements New comment(s) Necropost zltzlt → Codeforces Round 949 (Div. 2) New comment(s) MikeMirzayanov → Rule about third-party code is changing New comment(s) Necropost flamestorm → Codeforces Round #799 (Div. 4) Editorial Text created or updated Necropost UshanGhosh → Invitation to the Replay of ShellBeeHaken Presents Intra SUST Programming Contest 2024 New comment(s) jainnirav88 → Keep Problems — Browser Extension | Keep track of coding problems New comment(s) Necropost nubskr → I implemented codeforces from scratch New comment(s) Stefan2417 → Codeforces Round #948 (Div. 2) Editorial New comment(s) Kuroni → Codeforces Global Round 25 New comment(s) zltzlt → Codeforces Round 949 (Div. 2) Editorial New comment(s) tourist → Code Weekend #1 New comment(s) IceKnight1093 → Invitation to CodeChef Starters 137(Rated till 5-Stars) — 5th June New comment(s) ICPCNews → The 2023 Post World Finals Online ICPC Challenge powered by Huawei New comment(s) rek → Codeforces Round #456 (Div. 2) Editorial New comment(s) Necropost Detailed → Codeforces Round 951 (Div. 2)

By iNNNo, history, 37 hours ago, In English Hello, Codeforces! I am glad to invite you to participate in Codeforces Round 951 (Div. 2), which will take place at Thursday, June 6, 2024 at 10:35UTC-4.

This round will be rated for participants with a rating below 2100. Participants with a higher rating can take part out of competition.

You will be offered 6 problems and 2 hours to solve them! Interactive tasks may occur in the round. Please read this blog to get familiar with this type of problems.

All tasks are authored and prepared by me. However, I'd like to thank Greg908 for discussing ideas about problems and useful feedback!

I would like to thank:

Artyom123 for his amazing coordination!

74TrAkToR for the initial help with this round.

isaf27 for LGM testing.

dorijanlendvaj, A_G, Mangooste, andrei_boaca and BucketPotato for red testing.

ArtAlex, salyg1n, Kihihihi, 127.0.0.1, max0000561, ilyakrasnovv and a.nasretdinov for orange testing.

Semen07 for purple testing.

newb_programmer for blue testing.

A1st for cyan testing.

ishaandas1 for green testing.

TimoSvyato and HatakeyamaLeo for grey testing.

MikeMirzayanov and the entire Codeforces team for creating the wonderful platforms Codeforces and Polygon.

The goal was to create problems interesting to solve. Hope you'll enjoy them all!

Score distribution: 500−1000−1500−2000−2500−3000 ;

Good luck!

UPD: Congratulations to the winners!

Div. 2:

Tanikaze_Amane

olmrgcsi

PMPuns

MegalovaniaJ

Sylphrena

Div. 1 + Div 2:

turmax

jiangly

kotatsugame

peti1234

BurnedChicken

Editorial is out!

Full text and comments »

Announcement of Codeforces Round 951 (Div. 2) Vote: I like it+171Vote: I do not like it Author iNNNoPublication date 37 hours agoComments 242 Codeforces Round 950 (Div. 3)

By Vladosiya, history, 6 days ago, translation, In English Hello! Codeforces Round 950 (Div. 3) will start at Monday, June 3, 2024 at 10:35UTC-4. You will be offered 6-8 problems with expected difficulties to compose an interesting competition for participants with ratings up to 1600. However, all of you who wish to take part and have a rating of 1600 or higher, can register for the round unofficially.

The round will be hosted by rules of educational rounds (extended ICPC). Thus, solutions will be judged on preliminary tests during the round, and after the round, it will be a 12-hour phase of open hacks. After open hacks all accepted solutions will be rejudged on successful hacks.

You will be given 6-8 problems and 2 hours and 15 minutes to solve them.

Note that the penalty for the wrong submission in this round is 10 minutes.

Remember that only the trusted participants of the third division will be included in the official standings table. As it is written by link, this is a compulsory 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, then the round will be rated for you.

Problems have been created and written by our team: myav, Gornak40, senjougaharin and Vladosiya.

We would like to thank:

MikeMirzayanov for help with ideas and Polygon and Codeforces platforms.

Be_dos, Dominater069, 74TrAkToR, BucketPotato for red testing.

KseniaShk, cry, tolbi, ScarletS, nskybytskyi, sevlll777 for yellow testing.

mahdi.hasnat, Phantom_Performer, mainyutin for purple testing.

natalina, FBI, Kopite, MADE_IN_HEAVEN, mz1 for blue testing.

Romakolesn for cyan testing.

Good luck!

P.S.: We are aware of the error that occurred while updating the ratings for Educational Codeforces Round 166. It will be fixed before this round. UPD: We fixed it!

UPD: Editorial is out!

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Announcement of Codeforces Round 950 (Div. 3) Vote: I like it+196Vote: I do not like it Author VladosiyaPublication date 6 days agoComments 314 Codeforces Round 949 (Div. 2)

By zltzlt, history, 9 days ago, In English Hello, Codeforces!

We are glad to invite you to participate in Codeforces Round 949 (Div. 2), which will start on Friday, May 31, 2024 at 06:05UTC-4. Note the unusual start time of the round. You will be given 6 problems and 2 hours to solve them.

This round will be rated for participants whose rating is below 2100. Participants with higher rating can participate unofficially.

The problems were authored and prepared by sinsop90, yinhee and me.

I would like to thank:

244mhq for his wonderful coordination. sinsop90 and yinhee for providing problem ideas and discussing the problems with me. AFewSuns and crazy_sea for providing a better solution to one of the problems. Um_nik for the only LGM testing. A_G, antontrygubO_o, StarSilk, CharlieV, rui_er and Andreasyan for red testing. FengLing, YuJiahe, CSQ31, small_peter and JWRuixi for orange testing. yinhee, QwQwf, lovely-ckj, wsc2008qwq and Jryno1 for purple testing. sinsop90, dieselhuang, Edwin__VanCleef, wtc, WRuperD, starrykiller and gdf_yhm for blue testing. Ender32k and liangbowen for cyan testing. ishaandas1 for the only green testing. cyz2010 and cppcppcpp3 for grey testing. MikeMirzayanov for the great Codeforces and Polygon platforms. Last but not the least, You, for participating! Scoring distribution: 500−1000−1500−2000−2500−3500 .

Good luck & Have fun!

UPD: Congratulations to the winners!

Div 2:

cyb0101 Feduk_Pro_Spb whale_0086 graphcity grass8cos Div. 1 + Div. 2:

maspy Savior-of-Cross Rubikun femboy-wannabe turmax Editorial and also Simplified Chinese Editorial are out.

Full text and comments »

Announcement of Codeforces Round 949 (Div. 2) Vote: I like it+357Vote: I do not like it Author zltzltPublication date 9 days agoComments 190 Educational Codeforces Round 166 [Rated for Div. 2]

By awoo, history, 8 days ago, translation, In English Neapolis University Pafos

Hello Codeforces!

The series of Educational Rounds continues thanks to the support of the Neapolis University Pafos.

On Thursday, May 30, 2024 at 10:35UTC-4 Educational Codeforces Round 166 (Rated for Div. 2) will start.

This round will be rated for the participants with rating lower than 2100. It will be held on extended ICPC rules. The penalty for each incorrect submission until the submission with a full solution is 10 minutes. After the end of the contest, you will have 12 hours to hack any solution you want. You will have access to copy any solution and test it locally.

You will be given 6 or 7 problems and 2 hours to solve them.

The problems were invented and prepared by Adilbek adedalic Dalabaev, Ivan BledDest Androsov, Maksim Neon Mescheryakov, Roman Roms Glazov and me. Also, huge thanks to Mike MikeMirzayanov Mirzayanov for great systems Polygon and Codeforces.

Good luck to all the participants!

UPD: Editorial is out

Full text and comments »

Announcement of Educational Codeforces Round 166 (Rated for Div. 2) Vote: I like it+203Vote: I do not like it Author awooPublication date 8 days agoComments 266 The 3rd Universal Cup Announcement (with Details of Upcoming Online and Onsite Event on June 23!)

By Qingyu, 8 days ago, In English

Hello everyone, we are happy to announce that the 3rd Universal Cup has started officially. Universal Cup is an organization dedicated to offering training resources for competitive programming teams. In the previous season, over 900 teams from more than 500 affiliations all over the world, registered and participated in a total of 28 stages, encompassing contests from Asia, Europe, and America. We also want to express our gratitude to our sponsor Huawei.

• Semifinal and Summer Summit As announced before (Link), we will host the 2nd Universal Cup Semifinal on June 23, 2024. The contest will start at 17:00 (UTC +8) and end at 22:00 (UTC +8).

Any Universal Cup registered team can participate. If you are new here, please register following the instructions on Registration.

Register! Besides competing to advance to the UCup Finals, sponsored by Huawei, we also prepare prizes for teams in the top 10 (excluding onsite teams in the Summer Summit) . The prize details are as follows (may be replaced by products of similar value when processing):

Online Rank Prize for each team member (at most 3) Champion (Rank 1) HUAWEI WATCH GT 4 (46mm) Spruce Green First Prize (Rank 2 — 3) HUAWEI FreeClip Second Prize (Rank 4 — 10) HUAWEI Band 9 After the online semifinal, we will host a stream of all invited teams competing in the semifinal contest at the Summer Summit event in Cancun, along with problem analysis. The stream will start at 22:00 (UTC +8) and end at 03:00 (UTC +8).

English: YouTube (through tourist's account!)

Chinese: Bilibili (through jiangly's account!)

Here is a list of teams that will be competing onsite:

Team Member 1 Member 2 Member 3

1 USA1 (Andrew He, Kevin Sun, Gennady Korotkevich) ecnerwala ksun48 tourist 2 HoMaMaOvO (Riku Kawasaki, Masaki Nishimoto, Yui Hosaka) maroonrk maspy hos.lyric 3 03 Slimes (Kangyang Zhou, Mingyang Deng, Ziqian Zhong) orzdevinwang Rewinding TLE 4 Polish Mafia (Wojtek Nadara, Mateusz Radecki, Marcin Smulewicz) Swistakk Radewoosh Marcin_smu 5 Mei Dui Yao (Jiyu Shen, Qiuyang Zhang, Jincheng Zhai) PubabaOnO froggyzhang Chinese_zjc_ 6 Almost Retired Dandelion (Aleksei Daniliuk, Oleg Merkurev, Nikolay Kalinin) Um_nik Merkurev KAN 7 Let it Rot (Yi Qian, Bo Peng, Shiyuan Feng) skip2004 p_b_p_b Warriors_fsy 8 Yolki-palki (Vsevolod Nagibin, Denis Mustafin, Tikhon Evteev) Pechalka Kapt Tikhon228 9 yosupo (Kohei Morita, Takuto Shigemura, Ken Sugimori) yosupo sigma425 sugim48 10 Speed Star (Akihito Yoneyama, Kentaro Matsushita) YoshikaMiyafuji noimi 11 Amstelpark (Pavel Kunyavsky, Alice Sayutina, Mikhail Ipatov) PavelKunyavskiy cdkrot LHiC We also prepare prizes for this onsite competition:

Onsite Rank Prize for each team member (at most 3) Champion (Rank 1) HUAWEI MateBook X Pro i7 13th Silver (Rank 2) HUAWEI WATCH Ultimate Bronze (Rank 3) HUAWEI WATCH GT 4 Honorable Mention (Rank 4 -11) HUAWEI FreeClip - 3rd Season Online Stage As usual, this season's main activity is our online stage, where we hold weekly mirror contests. Please refer to our website https://ucup.ac/ for previous results. If you are interested in participation, please register following the instructions on Registration.

The online stage rule is still the same as last season:

Rules To provide more convenience, we implement a few more features on the system, including team composition, extra time window application, etc:

System Update Lastly, we would like to express our gratitude to MikeMirzayanov for letting us advertise Universal Cup in Codeforces and providing the great platform Codeforces and Polygon to help prepare contests. We are also very thankful to all contest stage setters for your support of the Universal Cup. If any setter would like to propose a stage, please feel free to contact us.

Universal Cup Committee:

Jingbang chenjb Chen Yuhao jqdai0815 Du Lingyu jiangly Jiang Yaowei Sugar_fan Lyu Qingyu Qingyu Shi Yaohui quailty Zeng Full text and comments »

Tags ucup Vote: I like it+268Vote: I do not like it Author QingyuPublication date 8 days agoComments 8 Code Weekend #1

By tourist, 3 weeks ago, translation, In English logo Hello everyone!

We, the RGBTeam (qwerty787788, Romka and tourist), are huge fans of heuristic programming competitions and are quite saddened by the fact that they are becoming less and less frequent each year. One day, we decided to organize our own competition :) Despite the fact that such ideas often remain just ideas, this time we have a serious mindset, and now we want to invite you all to participate in the first — and hopefully not last — Code Weekend #1!

The competition will be held in a format quite similar to ICFPC/Google Hashcode — there will be one problem and several dozen tests for it. You will need to submit just an output according to the rules of the problem for each test, which can be obtained using any algorithms, written in any language, and running for any duration of time. Midway through the competition, the problem statement will be expanded, and new tests will be added.

The competition starts on June 7th at 21:00 UTC and will last 48 hours. A day after it begins, on June 8th at 21:00 UTC, a second, expanded version of the problem along with a set of tests for it will be released. The competition ends another day after the release of the second version, on June 9th at 21:00 UTC.

The expanded version of the problem will be a superset of the basic version. For instance, if the problem is "given a chess position, find the best move," the basic version may only include pawns, bishops, and knights, while the expanded version will use rooks and queens.

The competition is team-based, and there is no limit on team size, but we've tried to balance the problem in a way that larger teams don't have a significant advantage over smaller ones. Therefore, the recommended team size is 1-4 people.

Unlike ICFPC, the focus of the competition will be on heuristic algorithms rather than functional programming (although in recent years ICFPC hasn't been focused on FP either).

Attention! The contest will be held on the website https://codeweekend.dev, you need to register there (once per team). All the announcements during the competition will be in the Discord chat, so join it via the link https://discord.gg/M6pG5zp3DF. Be sure to invite your friends, relatives, pets, and anyone else who might find it interesting :)

UPD. Our competition will be generously sponsored by the TON Foundation, for which we are immensely grateful!

As a result, the following prizes will be awarded in the competition:

1st place — 400 TON 2nd place — 300 TON 3rd place — 200 TON 4th place — 100 TON Additional prizes:

1st place after the first day of the competition — 111 TON. At the end of each minute of the competition, the current leader (provided there is at least one team with a positive score) receives 0.1 TON. 300 TON will be distributed equally for the best solution of each test at the end of the competition. For example, if there are 10 tests, and Team A has the best result in the first three tests while Team B has the best result in the remaining seven, Team A will receive 300/10*3 = 90 TON, and Team B will receive 300/10*7 = 210 TON. All ties are resolved by time — the team that achieves its result earlier ranks higher.

Thus, the total prize fund for the competition is over $10,000 at the current exchange rate.

Full text and comments »

Tags contest, heuristics Vote: I like it+989Vote: I do not like it Author touristPublication date 3 weeks agoComments 18 Codeforces Round #948 (Div. 2)

By Stefan2417, 2 weeks ago, translation, In English Hello, Codeforces!

After a year of anticipation and several complete changes to the problem set, we are glad to invite you to take part in Codeforces Round 948 (Div. 2), which will start on Sunday, Sunday, May 26, 2024 at 10:35UTC-4. This round will be rated for participants whose rating is below 2100. Participants with higher ratings may participate out of the competition.

You will be given 5 problems and 2 hours to solve them. All the problems in the round are created and prepared by Stefan2417 and alexchist.

The round may include one or more interactive problems. Please read this blog to get familiar with this type of problems.

We would like to thank:

Vladithur for excellent round coordination! A_G, JustNik77, AgafonovArtem, MADKIRUS, AndreyPavlov, PBBx0, Alexdat2000, RP-1, mwen, MrDelrus, tiom4eg, ezraft, TheEvilBird, Codula, Vamperox for testing the round and providing valuable feedback. MikeMirzayanov, geranazavr555, geranazavr555, vbandurin, ChurakovaAlexandra, medvezhonokok, Vladosiya and KAN for maintaining and developing the Codeforces and Polygon platforms! Score distribution: 500—1250—1750—2000—2500 .

Your perception of the scoring may vary, so be sure to read the later problems if you get stuck on one.

Upd: Congratulations to the Winners!

Div 2:

sun_gan_chou_yu_guan

Maksiwelle

suomynonA

new_mistakes

Kosyaaa

Div 1+2:

tourist

Sugar_fan

sun_gan_chou_yu_guan

abc864197532

BurnedChicken

Upd: editorial

Full text and comments »

Announcement of Codeforces Round 948 (Div. 2) Vote: I like it+276Vote: I do not like it Author Stefan2417Publication date 2 weeks agoComments 235 Codeforces Round #947 (Div. 1 + Div. 2)

By Bazoka13, 2 weeks ago, In English Hello, Codeforces! Or, as we like to say in Servalish (created by Serval): High-low, Cold-for-seize!

We are glad to invite you to participate in Codeforces Round 947 (Div. 1 + Div. 2), which will start on Saturday, May 25, 2024 at 10:35UTC-4. The round is a combined round and will be rated for everyone.

The problems are prepared by Atomic-Jellyfish, Nerovix, SanweiTreap, Serval, Toxel, jhdonghj112 and me. You will be given 9 problems to solve in 3 hours. Scoring distribution will be announced later.

We would like to thank everyone that makes this round possible:

Alexdat2000 for Russian translation. BFLSTiger and wzy2001wzy for providing some rejected problem proposals and discussing problems with us. 2sozx, JJLeo, YUKI_LELOUCH, Hanghang007, zlc1114, fried-chicken, zhicheng, fsfdgdg, H_W_Y, 200815147, CrTsIr, OMG_link, RDDCCD, SSerxhs, Tony2_CF, zhaohaikun, Hank2019, WZKQWQ, cxaphoenix, LGyxj, Oshwiciqwqq, fallleaves01, forget-star, monstersqaq, Narukara, Ricky2021, MagicalFlower, Saule_, kgqy, YSY_, dan_dolmatov, lowbob, sleepwa1ker, Nanako, Qingyu, Meatherm, PersistentLife2024, Vamperox, FransValli, skywalkert, shstyle, Lavine, kaichou243, gamegame, Cai_Guang, xhytom, qiuzx, Legitimity, Kevin114514, Adam_GS, htetgm, zengminghao, Melania, JCY_, yaoxi, schrodingerstom, jqdai0815, SSH_automaton, platelet and sjc061031 for testing the round and providing valuable feedbacks. MikeMirzayanov for the amazing Codeforces and Polygon platforms. You for participating in the round. We recommend you to read the statements of all problems. Good luck & Have fun! (=・ω・=)

A no-prize quiz UPD: Scoring distribution: 250-500-1000-1500-2000-2500-3000-4500-6000

UPD2: Editorial is available now.

UPD3: Thank you for your participation in this round! Congratulations to the winners:

tourist Golovanov399 maspy hos.lyric Um_nik And the first solves on each problem:

A: abdo3bkr B: Asaemon C: tourist D: tourist E: maspy F: tourist G: maspy H: Golovanov399 I: Ormlis UPD4: Chinese editorial is available now.

Photo of reviewer and some authors:

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Announcement of Codeforces Round 947 (Div. 1 + Div. 2) Vote: I like it+586Vote: I do not like it Author Bazoka13Publication date 2 weeks agoComments 153 ICPC Alumni Event in Sillicon Valley 2024

By Temirulan, history, 2 weeks ago, In English

We invite you to first ICPC alumni event in Silicon Valley on June 4 at 6pm.

This is a unique event that will bring together top ICPC alumni and friends. The event will be attended by ICPC President Bill Poucher, Freedom Holding CEO Timur Turlov and Bagdat Mussin, President of the Kazakh Federation of Competitive Programming.

Register here: https://lu.ma/ICPC_Meetup

P.S: wdyt about some small entertainy contest?

Full text and comments »

Tags icpc Vote: I like it+163Vote: I do not like it Author TemirulanPublication date 2 weeks agoComments 23 Codeforces Round #946 (Div. 3)

By Vladosiya, history, 3 weeks ago, translation, In English Hello! Codeforces Round 946 (Div. 3) will start at Monday, May 20, 2024 at 10:35UTC-4. You will be offered 6-8 problems with expected difficulties to compose an interesting competition for participants with ratings up to 1600. However, all of you who wish to take part and have a rating of 1600 or higher, can register for the round unofficially.

The round will be hosted by rules of educational rounds (extended ICPC). Thus, solutions will be judged on preliminary tests during the round, and after the round, it will be a 12-hour phase of open hacks.

You will be given 7 problems and 2 hours and 15 minutes to solve them.

Note that the penalty for the wrong submission in this round is 10 minutes.

Remember that only the trusted participants of the third division will be included in the official standings table. As it is written by link, this is a compulsory 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, then the round will be rated for you.

Round is based on UKIEPC 2024: Spring Practice. Please refrain from participating in this round if you are familiar with the tasks of this competition.

I would like to thank:

Authors of the original competition: Aksenov239, MaxBuzz, RobinFromTheHood, darnley, izban, pkhaustov, lsantire, az453, fedor.tsarev, Shoaib Jameel.

MikeMirzayanov for help with ideas and Polygon and Codeforces platforms.

-is-this-fft-, peltorator, tute7627 for red testing.

senjougaharin, kaikey, gmusya, nskybytskyi, Giga_Cronos, diskoteka for yellow testing.

TypeYippie, kzyKT, tepamid, ahshafi for purple testing.

Abo_Samrah, Zandler, sam07a, YESMAKHAN, xygzy, Klaus26 for blue testing.

Morvolzz, dasha..zhilina, sutekine, Muhsen, Gojova, Acanikolic73 for cyan testing.

You for participation.

Good luck!

UPD: Editorial is out.

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Announcement of Codeforces Round 946 (Div. 3) Vote: I like it+186Vote: I do not like it Author VladosiyaPublication date 3 weeks agoComments 242 ← 1 2 3 ... 232 233 →

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