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Educational Codeforces Round 90 [Rated for Div. 2]

Revision en5, by pikmike, 2020-06-28 10:50:07

Hello Codeforces!

On Jun/25/2020 17:35 (Moscow time) Educational Codeforces Round 90 (Rated for Div. 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 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 Ne0n25 Mescheryakov and me. Also huge thanks to Mike MikeMirzayanov Mirzayanov for great systems Polygon and Codeforces.

Good luck to all the participants!

Congratulations to the winners:

Rank Competitor Problems Solved Penalty
1 Geothermal 7 130
2 ksun48 7 143
3 300iq 7 147
4 vepifanov 7 168
5 Radewoosh 7 175

Congratulations to the best hackers:

Rank Competitor Hack Count
1 EduPeres 40
2 Grey_Matter 39:-3
3 lx430621 26:-1
4 killa_vanilla 25:-5
5 checkingagain 17:-1
351 successful hacks and 375 unsuccessful hacks were made in total!

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

Problem Competitor Penalty
A Geothermal 0:01
B ksun48 0:01
C ksun48 0:03
D Noureldin 0:09
E Geothermal 0:22
F ElOrdyh 0:15
G dario2994 0:29

UPD: Editorial is out


  Rev. Lang. By When Δ Comment
en5 English pikmike 2020-06-28 10:50:07 2620
ru4 Russian pikmike 2020-06-28 10:49:47 2596
en4 English pikmike 2020-06-26 18:34:59 72
ru3 Russian pikmike 2020-06-26 18:34:40 74
ru2 Russian Una_Shem 2020-06-24 19:38:58 0 (опубликовано)
en3 English Una_Shem 2020-06-24 19:38:46 0 (published)
en2 English pikmike 2020-06-24 16:46:42 22
en1 English pikmike 2020-06-24 16:45:13 1291 Initial revision for English translation (saved to drafts)
ru1 Russian pikmike 2020-06-24 16:44:37 1401 Первая редакция (сохранено в черновиках)