Hello again Codeforces!

errorgorn, oolimry and iLoveIOI are glad to invite you to participate in Codeforces Round 723 (Div. 2) which will be held at May/28/2021 17:05 (Moscow time). The round will be rated for the participants with a rating lower than 2100. Participants from the first division are also welcomed to take part in the competition but it will be unrated for them.

You will be given 2 hours and 30 minutes to solve 6 questions. One of the puzzles is interactive, please read the guide of interactive problems before the contest.

We would like to thank:

• Our lord and saviour antontrygubO_o for amazing coordination and rejecting our poopoo tasks
• dantoh and tqbfjotld for roasting our enigmas and testing them before they were prepared
• our many testers balbit, kshitij_sodani, Monogon, T1duS, icypiggy,user14767553, maomao90, hbarp, wxhtzdy, Jellyman102, ETK. and jamessngg for bricking on bamboozlers and destroying our testcases
• MikeMirzayanov for Codeforces and Polygon platforms

We hope you find the bugaboos interesting and fun! Wish you high rating!

Here is scoring distribution because you guys deserve it <3

• 500 — 1000 — (750+1000) — 2250 — 2500 — 3500

Btw, remember to downvote all testers who writes stupid comments to beg for likes.

UPD: editorial released

Hello everyone!

We invite you to participate in the ICPC Challenge powered by Huawei that will run from 12pm CST May 26 — 12pm CST May 30, 2021. The Challenge problem is based on a real-world industrial topic, providing participants the opportunity to learn about cutting-edge technologies, and is open to the global community.

The Challenge problem will be given in a pure graph-theory form and is part of an algorithm for compiler/runtime co-operative optimizations crucial for high throughput of Big Data analysis frameworks running on multi-node clusters.

Technical support during the Challenge will be offered throughout the duration of the Marathon. The technical team will be reading all comments/questions and will be providing answers and support as soon as possible.

Prizes for the top 20 Global Challenge performers are as follows:

• 1-4: Huawei MateBook X
• 5-8: Huawei P40 Pro
• 9-12: Huawei Matepad Pro
• 13-20: Huawei Watch GT 2 Pro

If the allocated Huawei Challenge prize cannot be delivered to your region for any reason it may be replaced by another prize of the same value, at the discretion of the sponsor.

All participants with an ICPC username will receive a Challenge completion certificate. If you don’t already have an ICPC username, you can register for one here. Please link your ICPC account to the Codeforces account here: https://codeforces.net/settings/general

By participating in this Challenge, you agree to the Challenge Rules and Conditions of Participation

About the ICPC Training Camp hosted by Huawei

The ICPC Training Camp powered by Huawei is an international program initiated by the International Collegiate Programming Contest University Commons (ICPCU) and proudly supported by Huawei. Structured in 3 distinct phases that began in Jan 2020, the program has offered a series of multi-regional training activities with the main goal of providing an open environment and continuous learning opportunities for existing competitors through the best academic and industry practices. The training program has included lectures and analysis from ICPC community membership, including coaches from ICPC World Finals championship teams, a variety of computational problems to solve, and Industrial Challenges.

The ICPC Training Camp series has been offered free of charge for all registered participants, thanks to Huawei’s generous support.

Contact Us: If you have any questions regarding the challenge or training camp, please contact [email protected].

Hi Codeforces!

Dio, Keshi, Tet, alireza_kaviani, Davoth, AliShahali1382 and I are delighted to invite you to participate in Codeforces Round 722 (Div. 1) and Codeforces Round 722 (Div. 2), which will be held at 24.05.2021 17:35 (Московское время). Each division will have 6 problems and 2 hours and 15 minutes to solve them.

The curse has finally been lifted! We are proud to announce that antontrygubO_o didn't reject even a single task from the Div. 1 part!

Huge thanks to the following people:

• antontrygubO_o for being an outstanding coordinator; This round wouldn't have happened if it weren't for him.

• Our ever-growing army of testers gamegame, Amoo_Safar, Atreus, dorijanlendvaj, aarr, Monogon, EnEm, N.N_2004, AaParsa, _Seyed37_, Roham, Clix, Narut, SinaSahabi, sinamhdv, arvindr9, shokouf, munghatekartik, Ali_Tavakoli, vodacbaoan, Shahraaz, -Suto-, coderz189, kassutta, the_borono, saarang, iANikzad, Etherite and -this-is-obd- for testing the round and providing invaluable feedback.

• MikeMirzayanov for the amazing platforms Codeforces and Polygon!

• Last but not least, to all the participants of this round!

For the sake of having short statements, this round does not have a theme. The characters featured in the statements are: Soroush (Tet), Sifid (Davoth), Parsa (Dio), Nima (N.N_2004), AaParsa (AaParsa), Haj Davood (davooddkareshki), Kavi (alireza_kaviani), Keshi (Keshi), Mashtali (AliShahali1382) and AmShZ (AmShZ).

Please read all of the problems and their notes, enjoy your time and solve as many as you can! Good luck have fun to everyone!

The scoring distributions will be announced later.

UPD: Here are the scoring distributions:

• Div. 1: 750 1000 1750 2000 2750 3000

• Div. 2: 500 1250 1750 2000 2750 3000

UPD: Editorial is out!

Hi, Codeforces!

I'm glad to invite you to take part in Codeforces Round #721 (Div. 2), which will take place on May/20/2021 17:35 (Moscow time). The round will be rated for the participants with a rating lower than 2100. Participants from the first division are also welcomed to take part in the competition but it will be unrated for them.

You will be given 2 hours to solve 5-6 problems. Problems were created by members of Club of Programmers IIT (BHU)- rivalq, sharabhagrawal25, loud_mouth, DenOMINATOR, Bignubie, mallick630, shikhar7s, CoderAnshu and Me.

Huge thanks to those who helped make this round possible:

• Aleks5d and KAN for their excellent coordination and for providing priceless feedback during contest creation.
• Monogon, ajit, kassutta, namanbansal013, Qualified, 4qqqq, Ekler, Rajdeep, wxhtzdy and kalki411 for testing and providing invaluable feedback.
• MikeMirzayanov for Codeforces and Polygon platforms.

We tried our best to create interesting problems and simple-to-read statements and we hope you have fun! Happy coding :)

UPD

Scoring Distibution:- 500 — (750 — 1500) — 1500 — 2250 — 3000

UPD

Congratulation to the winners

Global

1. ksun48
2. jiangly
3. alya_wow
4. Geothermal
5. TheIceKing

Div2

1. alya_wow
2. TheIceKing
3. fqwmc
4. l9ll6lll
5. Lenstar

UPD :- Editorial

Codeforces, welcome!

Registration for the ML competition from Raiffeisenbank that starts on May 17 is now open. The prize fund of the championship is 700,000 rubles. The competition is unrated.

All terms of participation were developed by the Raiffeisenbank eFX trading team in collaboration with Codeforces. Huge thanks to geranazavr555 for the testing and great advice and MikeMirzayanov for Codeforces systems.

Participants are invited to build a predictive model based on the provided historical data.

Cash prizes will be contested only among Russian residents (we expect winning participants to provide descriptions of their solutions in Russian).

Prizes:

• 1-4 places — 100K rubles each
• 5-10 places — 50K rubles each
• 1-60 places — merch packages

Registration is open until the end of the contest. Please fill in the contest registration form.

UPD1: Competition will now run for two weeks until May 31, 19:00 MSK!

UPD2: Use our baseline solution for a quick start

UPD3: Contest results are open. You can download the system testing data by the link http://assets.codeforces.com/rounds/1522/8f2fa64f1730ae12dc37504765d7e012e16613f0/tests2.csv

UPD4: Results will be announced within coming week! Stay tuned!

UPD5: The results are now final and the winners are:

1. PenaFeministka
2. arefiev.mc
3. YANK01
4. IgorDr1999
5. l4morak
6. Derbent
7. catforces
8. ZADaCHI
9. Taube
10. evteev

Congratulations! Everyone in global top-60 -- don't forget to check your inbox, we'll message you about merch packages.

Hello Codeforces!

On May/16/2021 11:00 (Moscow time) Educational Codeforces Round 109 (Rated for Div. 2) will start. Please, note the unusual start time.

Series of Educational Rounds continue being held as Harbour.Space University initiative! You can read the details about the cooperation between Harbour.Space University and Codeforces in the blog post.

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 Roman Roms Glazov, Adilbek adedalic Dalabaev, Vladimir vovuh Petrov, Ivan BledDest Androsov, Maksim Neon Mescheryakov and me. Also huge thanks to Mike MikeMirzayanov Mirzayanov for great systems Polygon and Codeforces.

Good luck to all the participants!

Our friends at Harbour.Space also have a message for you:

Dear Codeforces!

We are reaching out to make sure you have everything you need to begin your journey at Harbour.Space University. That’s why we are hosting our very first Virtual Open.Day on May 20th at 4:30 p.m. (CET).

This Open.Day is an opportunity for our university to open its doors (virtually) for you to get an idea of what to expect in terms of the academic experience, student life, living in Barcelona and asking any questions you might have.

Remember, we have a full scholarship available for competitive programming! This scholarship is for Bachelor’s and Master’s students wanting to join any of our tech-related programmes and our dynamic programming team. Joining the Open.Day is the perfect opportunity for you to ask questions and make sure Harbour.Space is the right place for you.

Register for our Virtual Open.Day and see first-hand what life is like as a Spacer and the success stories of our scholarship recipients.

Here is a sneak peek: https://www.youtube.com/watch?v=y6f999g7qFA

Good luck on your round, and see you next time!

Harbour.Space University

UPD: Editorial is out

Hi, Codeforces!

I'm glad to invite you to take part in Codeforces Round 720 (Div. 2), which will take place on May/07/2021 17:35 (Moscow time). The round will be rated for the participants with a rating lower than 2100. Participants from the first division are also welcomed to take part out of competition.

You will be given 2 hours 15 minutes to solve 5 problems. All the problems were created and prepared by me. One of the problems is interactive, please read the guide of interactive problems before the contest.

Huge thanks to those who helped make this round possible:

• Fliahin for being the first who gave feedback and helped with ideas on some problems.
• Denisov for providing priceless feedback during the entire creation of the round.
• KAN and Aleks5d for their excellent coordination.
• Valera_Grinenko, kalki411, PurpleCrayon, BOGDAN_, okwedook, namanbansal013, 16204, ermakov22, Denisov, 4qqqq, alexX512, IaMaNanBord, perekopskiy, kassutta and never_giveup for testing and providing invaluable feedback.
• MikeMirzayanov for Codeforces and Polygon platforms.

I tried my best to create interesting problems and clear statements, so don't forget to read all ones :)

Scoring: $$$500-1000-1750-2250-2750$$$.

Hope you enjoy it!

UPD: Editorial is published!

UPD: Congratulations to the winners!

Div. 1:

1. dorijanlendvaj

2. Tlatoani

3. Maksim1744

4. neal

5. Monogon

Div. 2:

1. musdolph

2. krasav4ik

3. in_love_with_Liza

4. hyta4982

5. lana_og

Hi!

On 02.05.2021 17:35 (Московское время), we will host Codeforces Global Round 14.

This is the second round of the 2021 series of Codeforces Global Rounds. The rounds are open and rated for everybody.

The prizes for this round:

• 30 best participants get a t-shirt.
• 20 t-shirts are randomly distributed among those with ranks between 31 and 500, inclusive.

The prizes for the 6-round series in 2021:

• In each round top-100 participants get points according to the table.
• The final result for each participant is equal to the sum of points he gets in the four rounds he placed the highest.
• The best 20 participants over all series get sweatshirts and place certificates.

Thanks to XTX, which in 2021 supported the global rounds initiative!

All problems were written and prepared by me FieryPhoenix and dragonslayerintraining.

Huge thank you to everyone who made this round possible:

• adedalic for coordinating our round!
• frodakcin, Xylofo, awoo, prabowo, Kilani, Roundgod, thenymphsofdelphi, Nezzar, BledDest, PurpleCrayon, 16204, nchn27, Aaeria, notTehlka, namanbansal013, coderz189, saurabhyadavz, HIS_GRACE, Amazed, AlanTheMankey for testing and valuable feedback!
• MikeMirzayanov for Codeforces and Polygon platforms!
• You, for being you!

You will have 3 hours to solve 9 problems. Scientific studies have shown irrefutable evidence that upvoting this blog and participating in this round will lead to longevity and happiness. GLHF!

UPD: The scoring distribution is 500 — 1000 — 1500 — 2000 — 2750 — 3250 — 3500 — 4250 — 5000

UPD: Editorial is here!

UPD: Congratulations to the winners!!

1. Radewoosh
2. ksun48
3. Um_nik
4. Benq
5. yhx-12243
6. tourist
7. duality
8. jiangly
9. LJC00118
10. NotaMotuaQAQ