Hello CodeForces! This year again, I'd like to invite you to the online mirror of an open championship of Switzerland called the Helvetic Coding Contest. A mirror was also held last year — see here: [contest:690]↵
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[The Helvetic Coding Contest](http://hc2.ch/) is a yearly contest held at [the EPFL](http://epfl.ch/) in Lausanne by the [PolyProg](http://polyprog.epfl.ch/) association. The contest itself took place on April the 1st, but the online mirror is scheduled on [**Sunday, 28th of May, 11:05 Moscow time**](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Helvetic+Coding+Contest+2017+online+mirror&iso=20170528T0805&ah=4&am=30). The duration is 4:30.↵
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Rules:↵
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- you can participate in teams or individually (1-3 people),↵
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- standard ACM-ICPC rules (no hacking),↵
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- the contest is not rated,↵
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- if you have participated in the onsite contest, please do not participate in the mirror.↵
↵
You will help us [find the cow Heidi](http://hc2.ch/img/poster/poster.png) and participate in some April-Fools-Day confusion. The contest will feature 5 series of 3 related tasks with increasing difficulty (easy/medium/hard). Sometimes it may be the case that a solution for the hard version solves all of them, but usually not. We think that the problemset is diverse and interesting, and while the contest is ACM-style, you will find that some problems are not so standard. Most easy&medium problems are even solvable in Python, so you can also recommend this contest to your newbie friends :)↵
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Acknowledgments: the problems were set by Christian Kauth, [user:boba5551,2017-04-17], [user:meret,2017-04-17], [user:DamianS,2017-04-17] and myself.↵
Thanks also go out to people who helped with the statements and testing: [user:maksay,2017-04-17], Michalina Pacholska (who also draws the cows), Benjamin Schubert, Aleksa Stanković, Ruofan Zhou; [user:Tatiana_S,2017-05-23] for Russian translations and [user:KAN,2017-05-23] for CodeForces coordination,↵
as well as everyone involved in the actual onsite contest, who are too many to name here. We also thank the sponsors [Open Systems](http://open.ch/) and [AdNovum](http://www.adnovum.ch/). Lastly, thanks to [user:MikeMirzayanov,2017-04-17] for CodeForces and Polygon (which was used to prepare the problems).↵
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Finally, in a bit of autopromotion, note that you can use [Hightail](http://codeforces.com/blog/entry/13141) to automatically test your solutions :) Good luck!↵
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**EDITAfter-contest UPDATE:**↵
[>>> Editorial <<<](http://dj3500.webfactional.com/helvetic-coding-contest-2017-editorial.pdf)↵
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Feel free to ask questions in this topic.↵
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Thanks to everyone who participated! We hope you have enjoyed the problems. Congratulations to the winners:↵
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1. ★SweeT DiscoverY★: [user:dotorya,2017-05-28], [user:zigui,2017-05-28], [user:cki86201,2017-05-28] (solved all problems!)↵
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2. japan-cookie: [user:sigma425,2017-05-28], [user:sugim48,2017-05-28], [user:yosupo,2017-05-28] (solved all problems!)↵
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3. HSE Bluebell: [user:Um_nik,2017-05-28], [user:Kronecker,2017-05-28]↵
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4. Veteran: [user:I_love_Hoang_Yen,2017-05-28], [user:chemthan,2017-05-28], [user:RR_PPAP,2017-05-28]↵
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5. m(_ _)m: [user:tmt514,2017-05-28], [user:Shik,2017-05-28], [user:dreamoon,2017-05-28]↵
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6. never red: [user:abyssmall,2017-05-28], [user:gongy,2017-05-28], [user:gendelpiekel,2017-05-28]↵
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7. [user:rng_58,2017-05-28]↵
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8. (｀・ω・´): [user:FizzyDavid,2017-05-28], [user:OhWeOnFire,2017-05-28]↵
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The winners of the onsite contest (Petr Team) also solved all problems.↵
↵
See you again next year!
↵
↵
[The Helvetic Coding Contest](http://hc2.ch/) is a yearly contest held at [the EPFL](http://epfl.ch/) in Lausanne by the [PolyProg](http://polyprog.epfl.ch/) association. The contest itself took place on April the 1st, but the online mirror is scheduled on [**Sunday, 28th of May, 11:05 Moscow time**](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Helvetic+Coding+Contest+2017+online+mirror&iso=20170528T0805&ah=4&am=30). The duration is 4:30.↵
↵
Rules:↵
↵
- you can participate in teams or individually (1-3 people),↵
↵
- standard ACM-ICPC rules (no hacking),↵
↵
- the contest is not rated,↵
↵
- if you have participated in the onsite contest, please do not participate in the mirror.↵
↵
You will help us [find the cow Heidi](http://hc2.ch/img/poster/poster.png) and participate in some April-Fools-Day confusion. The contest will feature 5 series of 3 related tasks with increasing difficulty (easy/medium/hard). Sometimes it may be the case that a solution for the hard version solves all of them, but usually not. We think that the problemset is diverse and interesting, and while the contest is ACM-style, you will find that some problems are not so standard. Most easy&medium problems are even solvable in Python, so you can also recommend this contest to your newbie friends :)↵
↵
Acknowledgments: the problems were set by Christian Kauth, [user:boba5551,2017-04-17], [user:meret,2017-04-17], [user:DamianS,2017-04-17] and myself.↵
Thanks also go out to people who helped with the statements and testing: [user:maksay,2017-04-17], Michalina Pacholska (who also draws the cows), Benjamin Schubert, Aleksa Stanković, Ruofan Zhou; [user:Tatiana_S,2017-05-23] for Russian translations and [user:KAN,2017-05-23] for CodeForces coordination,↵
as well as everyone involved in the actual onsite contest, who are too many to name here. We also thank the sponsors [Open Systems](http://open.ch/) and [AdNovum](http://www.adnovum.ch/). Lastly, thanks to [user:MikeMirzayanov,2017-04-17] for CodeForces and Polygon (which was used to prepare the problems).↵
↵
Finally, in a bit of autopromotion, note that you can use [Hightail](http://codeforces.com/blog/entry/13141) to automatically test your solutions :) Good luck!↵
↵
**
[>>> Editorial <<<](http://dj3500.webfactional.com/helvetic-coding-contest-2017-editorial.pdf)↵
------------------↵
Feel free to ask questions in this topic.↵
↵
Thanks to everyone who participated! We hope you have enjoyed the problems. Congratulations to the winners:↵
↵
1. ★SweeT DiscoverY★: [user:dotorya,2017-05-28], [user:zigui,2017-05-28], [user:cki86201,2017-05-28] (solved all problems!)↵
↵
2. japan-cookie: [user:sigma425,2017-05-28], [user:sugim48,2017-05-28], [user:yosupo,2017-05-28] (solved all problems!)↵
↵
3. HSE Bluebell: [user:Um_nik,2017-05-28], [user:Kronecker,2017-05-28]↵
↵
4. Veteran: [user:I_love_Hoang_Yen,2017-05-28], [user:chemthan,2017-05-28], [user:RR_PPAP,2017-05-28]↵
↵
5. m(_ _)m: [user:tmt514,2017-05-28], [user:Shik,2017-05-28], [user:dreamoon,2017-05-28]↵
↵
6. never red: [user:abyssmall,2017-05-28], [user:gongy,2017-05-28], [user:gendelpiekel,2017-05-28]↵
↵
7. [user:rng_58,2017-05-28]↵
↵
8. (｀・ω・´): [user:FizzyDavid,2017-05-28], [user:OhWeOnFire,2017-05-28]↵
↵
The winners of the onsite contest (Petr Team) also solved all problems.↵
↵
See you again next year!
