Educational Codeforces Round 80 [Rated for Div. 2]

Revision en5, by awoo, 2020-01-15 18:42:37

Hello Codeforces!

On 14.01.2020 17:35 (Московское время) Educational Codeforces Round 80 (рейтинговый для Див. 2) will start.

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 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:

Hello Muscat

Hi Codeforces!

As a special prize for the Educational Round 80, we would like to invite the top 3 participants to take part in our Hello Muscat ICPC Programming Bootcamp, which will take place in Oman, from March 19 to March 25, 2020. The prize will cover the participation fee, accommodation, and half-board meals for the entire duration of the bootcamp (except flights)!

There are three requirements to satisfy:

  • You took part in at least 10 rated contests on Codeforces
  • Your max rating should be less than 2400
  • You should be eligible for ICPC and/or IOI 2020+
Fill out the form→

Good luck to everyone!

Note: If you really want to participate, but cannot afford the participation fee, get in touch with us to request a supporting letter for you to show to your university, employer, or local companies. With this letter, you are opening the possibility of being sponsored by them to attend the bootcamp.

Please fill out this form and we’ll send you the support letter within 3 days!

Congratulations to the winners:

Rank Competitor Problems Solved Penalty
1 isaf27 6 150
2 FSTForces 6 167
3 jiangly 6 178
4 ko_osaga 6 179
5 jhnan917 6 184

Congratulations to the best hackers:

Rank Competitor Hack Count
1 surung9898 59:-2
2 stdmultiset 35:-1
3 B2ej5SjC 30
4 spectre_1502 21:-1
5 Dilemma27 20:-4
434 successful hacks and 746 unsuccessful hacks were made in total!

And finally people who were the first to solve each problem:

Problem Competitor Penalty
A okwedook 0:01
B neal 0:04
C ko_osaga 0:06
E peach 0:17
F jiangly 1:13

UPD: The editorial is out


  Rev. Lang. By When Δ Comment
en5 English awoo 2020-01-15 18:42:37 2528
ru6 Russian awoo 2020-01-15 18:42:24 2504 Мелкая правка: 'ней!_ \n\n**UPD:' -> 'ней!_ \n\n\n\n**UPD:'
en4 English awoo 2020-01-15 18:38:32 76
ru5 Russian awoo 2020-01-15 18:38:10 74
ru4 Russian Una_Shem 2020-01-13 19:50:03 0 (опубликовано)
en3 English Una_Shem 2020-01-13 19:49:54 0 (published)
en2 English Una_Shem 2020-01-13 19:26:23 1711
ru3 Russian Una_Shem 2020-01-13 19:25:05 2 Мелкая правка: 'имечание: Если вы де' -> 'имечание: \nЕсли вы де'
ru2 Russian Una_Shem 2020-01-13 19:23:58 1757
en1 English awoo 2020-01-13 16:47:35 1280 Initial revision for English translation (saved to drafts)
ru1 Russian awoo 2020-01-13 16:46:59 1396 Первая редакция (сохранено в черновиках)