Educational Codeforces Round 12

Revision en1, by Edvard, 2016-04-19 00:36:40

Hello, Codeforces!

Educational Codeforces Round 12 will take place on 19 april 2016 at 18:00 MSK for the first and the second divisions.

The round will be unrated for all users and it will be held with extented ACM ICPC rules. You will have two hours to solve six problems. After that you will have one day to hack any solution you want. You will have access to copy any solution and test it locally.

If you have ideas for some problems or maybe already prepared problems that you can't use in rounds or official competitions, you can write to me.

It seems that it is harder to invent interesting simple problems (like A and B) than difficult ones. So don't be afraid to suggest interesting simple or very simple tasks (of course the difficult tasks are also needed). Please send only the problems for which you know the solution with clear statement (the story is not required). And also please add one or two samples to make the problem statement more clear.

The problemset was suggested by Codeforces users (it's time to lift this sentence inside the tegs). The problem А was suggested by user unprost. The problem B was suggested by Ayush Anand JeanValjean01. The problems C, D and E was suggested by Zi Song Yeoh zscoder. Sheikh Monir skmonir a long ago sent me a problem with difficulty C or D. I improved it by significant increase of the constraints (thanks to Mikhail Tikhomirov Endagorion who told how to solve such things). So the problem F was born.

Thanks a lot to them and all others who are sending the problems! The number of unused problems are increasing. If I didn't miss anything I already replied to all who sent me the problems at least 5-6 days ago. Please be patient if your problem was not used a long while.

Задачи для вас подготовил я (Эдвард Давтян). Спасибо Маше Беловой Delinur за проверку английских текстов условий. Задачи вычитывали и тестировали пользователи, предложившие их, соответственно unprost, Ayush Anand JeanValjean01, Zi Song Yeoh zscoder и Sheikh Monir skmonir. Большое им за это спасибо!

The problems was prepared by me (Edvard Davtyan). Thanks to Maria Belova Delinur for checking the English statements. The problems was tested by users suggested them, respectively: unprost, Ayush Anand JeanValjean01, Zi Song Yeoh zscoder and Sheikh Monir skmonir. Thanks a lot to all of them!

I hope you will enjoy the problems! On my mind all the problems except of F is easier than usual, but F is harder.

Good luck and have fun!

Only 30 days left to the ACM ICPC World Finals!

It will be difficult to focus on the problems in such a beautiful place :-)

Tags education round 12, announcement

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  Rev. Lang. By When Δ Comment
ru13 Russian Edvard 2016-04-21 01:58:04 58
ru12 Russian Edvard 2016-04-21 00:49:10 42
en6 English Edvard 2016-04-21 00:48:19 75
en5 English Edvard 2016-04-20 20:04:06 151
ru11 Russian Edvard 2016-04-20 20:02:09 6 Мелкая правка: 'Удачи!\n\nОпубликова' -> 'Удачи!\n\nUPD2: Опубликова'
ru10 Russian Edvard 2016-04-20 20:01:46 163
ru9 Russian Edvard 2016-04-20 19:12:12 20 Мелкая правка: 'предложил пользователь [user:unp' -> 'предложил Сергей Эрлих [user:unp'
ru8 Russian Edvard 2016-04-19 10:37:40 104
en4 English Edvard 2016-04-19 10:36:54 64
en3 English Edvard 2016-04-19 10:36:12 8
ru7 Russian Edvard 2016-04-19 10:35:51 8
en2 English Edvard 2016-04-19 00:37:59 394
en1 English Edvard 2016-04-19 00:36:40 3263 Initial revision for English translation
ru6 Russian Edvard 2016-04-19 00:18:49 13
ru5 Russian Edvard 2016-04-19 00:18:22 70 (опубликовано)
ru4 Russian Edvard 2016-04-19 00:16:12 131
ru3 Russian Edvard 2016-04-19 00:08:07 15 Мелкая правка: 'остепенно увеличивается. Если я н' -> 'остепенно растёт. Если я н'
ru2 Russian Edvard 2016-04-19 00:07:08 60
ru1 Russian Edvard 2016-04-19 00:04:10 3572 Первая редакция (сохранено в черновиках)