Hello, Codeforces!

At [contest_time:329695] will take part [contest:329695].

• The contest is carried out according to the IOI rules. You will be given from 5 to 10 tasks for 4 hours. An hour before the end of the round, the table will be frozen.

• The tasks will vary greatly in complexity — from the simplest to the most complex.

• The round is not rated!!!

• You can use all materials, which are published before beginning of the round.

• Tasks are in the order of the story, not difficulty!

The tasks are tested by Irpacci, High_Faev, Irsanik, Gareton, xyz..

Thanks MatesV13 for creating english statements!!!

Also thanks a lot MikeMirzayanov for systems Polygon and Codeforces and geranazavr555 for explaining various technical aspects!

I wish you luck on the round!

Upd: the round based on the anime "The Promised Neverland".

Upd2: Registration is opened!

Upd3: Editorial: https://mirror.codeforces.com/blog/entry/91605

Upd4: Congratulations!!!

Upd5: Finished doing diplomas. Link to them:

https://drive.google.com/drive/folders/1RsYBfLAxHlRndZ_m4_FCTG7pPBG2oRdL?usp=sharing

oleh1421

andr1y

TryMax

ILL1A

Anecstasiya

Link for registration:

https://mirror.codeforces.com/contestInvitation/85a130edb18aa879d81952e0a3427b6187f12fb3

If you are registered:

https://mirror.codeforces.com/contests/329695

Hello, codeforces! I want to ask some questions about codeforces and polygon (I make tasks on polygon):

1. Can I do so, that solutions, which fall on the first test, will not be counted in table?

2. Can I add pretests and hacks to my contests?

3. Can I add deferred publication to my blog (for example for editorial)?

4. Can I somehow copy some contest so, that I would be able to edit condition?

5. Can I add score for tasks?

Today I wanted to create rating. A added all I need, saved and then I saw bug window on cf. Who had fixed it before?

I caught similar bug after rollback of correction in blog.

Rating: https://mirror.codeforces.com/group/rXA6oDkdyg/customrating/2626

Correction: https://mirror.codeforces.com/topic/90828

Ps: Ping geranazavr555.

UPD: second part was solved: I log out and then log in in account. First part is not solved yet.

UPD: first part is provlem with SPbSU contest on codeforces.

Hello, Codeforces!

At [contest_time:305369] will start Belarusian round #2: Simran, Muskan, Divyansh, Pranjal and their problems (Div. 3).

This is my first IOI round, I hope you like it) 15 minutes before the end table will be frozen.

UPD: tasks are not sorted by difficulty!

You will be given 6 tasks and 2 hours to solve.

For creating English statements I want to give thanks: MatesV13, Radhe_Loves_To_Eat and ahmedfouadnew.

Tasks were tested by: Radhe_Loves_To_Eat, ahmedfouadnew, MatesV13, Gareton, Xennon, cirieena, Irpacci and Artem___.

Thanks MikeMirzayanov for Polygon and Codeforces!

Good luck! I wish you only Perfect results!)

To register:

https://mirror.codeforces.com/contestInvitation/19e1d6bcd351edb57df326e05cce16c73715d02c

If you are registered:

https://mirror.codeforces.com/contests/305369

Today I tried to create new task on polygon. When I wanted to create statements, I saw task failed. It offered to Resolve conflicts, which didn't help. In addition, my old tasks don't work( Help me please to fix it!

UPD: Problem is solved! Thank you all for helping!)

Hello! Here is editorial!

Here is announcement

Task A — Roman and calculator

Task B — Roman and lost numbers

Task C — Roman and passes

Task D — Roman and paradox

Task E — Roman and summer vacations

Task F — Roman and hard experiment

Hello, Codeforces!

On wednesday, 10 june 2020 y. on 17:35 (UTC + 3) will take place End of the learning — Beginning of the tour contest (Div 3).

This is my first round (mashup, because for creating trainings I haven't got rating, because I need to stop writing contests on the phone) with my tasks. Competition will be held according to the rules of ICPC. Penalty for every wrong submission is 20 minutes. 20 minutes before contest table will be freezed.

You will be given 6 tasks and 2 hours. I wish you like it. I have high hopes for E task.

Ahmad Ahmadsm2005 Said, Ahmed ahmedfouadnew Fouad, Matvey Irpacci Kulinich and Maxim Xennon Karpuk helped me with testing tasks. Also thanks to Mike MikeMirzayanov Mirzayanov for systems Polygon and Codeforces!

I wish you luck!

I almost forgot about link:

https://mirror.codeforces.com/contestInvitation/4036ec99932a47484351d57a812de34c7a4fbb2c

Here is editorial