aryanv's blog

Iranian Combinatorics Olympiad 2024
By aryanv, history, 2 weeks ago, In English

Hello everyone,

The Iranian Combinatorics Olympiad is back!

For those who are not familiar with this competition, this is an online event which is free to register and participate in. Everyone can participate in this challenge in a team of at most 3! The contest contains two rounds and students will be challenged to solve IMO style combinatorial questions. The nice thing about this contest, is that it is the first contest in the world that has an online judging system for a theoretical exam. The registration is now open!

Anyone in any grade and educational level can participate in this exam.

As I mentioned above, this contest is completely free and we are relying on sponsors to support such an event! To help us grow and make this contest is bigger, the only request that we have from you guys is to:

1) Participate in this event if you are interested in solving these types of problems

2) If it is possible for you, we would be happy if you can send us a short video (to our official email), introducing yourself, your nationality and say "OLAMPIAD TARKIBIAT IRAN" which translates to "Iranian Combinatorics Olympiad". We would like to thank you in advance for your kind support.

The event will be on two days, 31st of October and 1st of November.

official website: https://ico-official.com email: [email protected]

If you have any questions, you can ask under this blog and I will try to answer them as much as possible.

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2 weeks ago, # |
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Is this like IGO?

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    2 weeks ago, # ^ |
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    It will be very similar, however the questions will be combinatorics instead of Geometry. Usually the questions will have higher quality and require more creativity in ICO when compared to IGO.

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2 weeks ago, # |
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Finally! A math contest that I might solve something in!

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2 weeks ago, # |
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If a team participates online, do they have to gather in the same place or can they participate from their home?

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    2 weeks ago, # ^ |
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    There is no need to gatherin the sane place! They can participate from their home

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2 weeks ago, # |
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I see how 2020 had a "short answer exam" and "main exam", while 2021 had round 1 and round 2 (this is based on the info from archive). Will a similar system be adopted this year?

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    2 weeks ago, # ^ |
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    Yes there will be the similar system. First round will be a "Short answer exam" and the second round will be "Long proof questions".

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2 weeks ago, # |
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How many problems are there? Since I looked at the booklet and there were more than 20 I'm guessing that's the shortlist. How are answers sent? as a number or with proof? And is it all day or we can choose the hour? What hour will it be?

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    2 weeks ago, # ^ |
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    There will be 15 questions in the short answer part and you will have 2 hours to solve them. There will be 7 questions on the long answer part and you will have 5 hours to solve them.

    The exam will be:

    31th of October — The exam will start at 8:30 am (EST) or 4:00 pm (Iran's local time) 1st of November — The exam will start at 6:30 am (EST) or 2:00 pm (Iran's local time)

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      2 weeks ago, # ^ |
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      How many tries do we get in the short answer first round? Do we get less points if we get it wrong?

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        2 weeks ago, # ^ |
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        You won't notice if it is wrong! The live judging system is only for the long answer part! In the short answer part if you are wrong then you will find out at the end of the exam! There is no negative marks for answering the questions wrong. However, the teams with the same score will be ranked based on the number of incorrect answers (lesser the better) to qualify for the Long answer part

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          2 weeks ago, # ^ |
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          How do you decide who advances to round 2?

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            2 weeks ago, # ^ |
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            In the elementary level there is no round 2. In the advanced level the top 30 teams from the first round and in the level "Free" the top 20 teams will be qualified to participate in the second round. There are some additional rules based on the country you are participating from as well. (Only top 2 teams of every country can reach the final round)

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              2 weeks ago, # ^ |
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              Are elementary and advanced the same questions?

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              12 days ago, # ^ |
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              My team (all in grade 9 or below) is registered for the ICO. Will we be in the elementary or advanced category?

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                12 days ago, # ^ |
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                Elementary

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                  12 days ago, # ^ |
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                  Thanks.How many rounds are there in the Elementary category, and how many questions are in each round?

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                  12 days ago, # ^ |
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                  1 round, 15 questions

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                  12 days ago, # ^ |
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                  What is the date and time (IST) of the Round 1 exam for the Elementary category?

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2 weeks ago, # |
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Hi, I'm interested in participating in this contest. Had a great experience in the 2021 edition.

Just want to check what time the contest is being held. I can't find this info. Also are non-students allowed to participate? What should I put for the "school name" in the registration form?

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    2 weeks ago, # ^ |
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    Hi, we are glad to hear that! Of course! The level "Free" is exactly designed for people who are students in University of not students at all. If you are not a student just fill in N/A as your "school name".

    The time of the exam is:

    31th of October — The exam will start at 8:30 am (EST) or 4:00 pm (Iran's local time)

    1st of November — The exam will start at 6:30 am (EST) or 2:00 pm (Iran's local time)

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2 weeks ago, # |
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I would like to generally add that if you would like to participate in the exam. IT WOULD BE A VERY VERY BIG SUPPORT TO US TO SEND THE VIDEO I explained in my blog. That is a significant help for us to find sponsors and keep the exam free of any charge.

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2 weeks ago, # |
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Is it open book?

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    2 weeks ago, # ^ |
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    yup! You are allowed to use any materials inside any book or internet (as long as it is written before the starting time of the contest)

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2 weeks ago, # |
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I have tried to register from Bangladesh several times, but every time a server issue occurred.

When I tried for the 1st time, the server issue "Oops...." occurred. I tried several times again, but each time, it showed, "All the emails and phone numbers have already been taken." I tried to log in with the same information, but it still didn't work. My teammate also tried to register from a different device but, he faced the same problem.

What should I do?

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    2 weeks ago, # ^ |
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    Hi Try again! The problem should be solved

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      2 weeks ago, # ^ |
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      We tried again but, the issue was not solved. It shows the same massage.

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2 weeks ago, # |
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What is the deadline for registring for the competition? Also, will we need to join a zoom meeting or something like that for supervising?

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    2 weeks ago, # ^ |
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    26th of October! No the exam won't have any kind of supervising! Notice that the exam is open book and you are allowed to use your coding skills for the Short answer questions if you found it helpful

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2 weeks ago, # |
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In the PDFs on the official website, under the archive for previous contests, I only see numeric answers for the first section. Are there solution explanations for these problems?

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    2 weeks ago, # ^ |
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    Unfortunately I believe that the explained solution does not exists for these problems and only the numeric answer is available at the current moment.

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2 weeks ago, # |
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How to pronounce olampiad tarkibiat iran?

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    13 days ago, # ^ |
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    Exactly how it is written! "OLAMPIAD TARKIIBIIAT IRAN" Thank you so much. Notice the two "II" is exactly pronounced like the two "ee" in the word "Teeth"

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13 days ago, # |
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Should all team members join the contest to submit the answers or any one from the team should submit?

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    13 days ago, # ^ |
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    Anyone from the team can submit the answers!

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13 days ago, # |
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It is possible to allow password change of the team account?

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9 days ago, # |
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is the registration over?

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8 days ago, # |
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When I registred my team, I selected that we were in 9th grade or below (as we were), but can we participate in the advanced category? Also, do I have to write an email about this request or can we just select the category during the contest?

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    8 days ago, # ^ |
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    As far as I am aware, this is not possible! but try your luck by sending them an email!

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8 days ago, # |
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To all who have registered the online event!

You can follow the official news from the following Telegram Channel: https://t.me/ICOofficial

The first round will start tomorrow (October 31st) at 4:00 pm (Iran's standard time) which is equivalent to 8:30 am (EST)

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8 days ago, # |
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Hello. My website says 23 mins till contest starts even thought it should be 3 mins. Please help.aryanv

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    8 days ago, # ^ |
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    I assume youre participating in the free-level. We have the same problem.

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8 days ago, # |
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This is a bit late but our team should be in advanced but the website put is into the free level for the first round. Is there a way to fix this for the second round to be in the advanced section? aryanv

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8 days ago, # |
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Does the official website have English statements ? I just can see the Iranian version for the problems

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7 days ago, # |
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When will results be published?

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    7 days ago, # ^ |
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    also the expected answers?

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      7 days ago, # ^ |
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      Our answers:
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    7 days ago, # ^ |
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    The final results should be published in about 2 hours! (8:00 PM Iran's Standard Time)

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7 days ago, # |
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Here are the answers for my team (advanced/free) if anyone wants. We think Q2 is wrong, the answer can be 3,4,5. Below are the constructions:

constructions for q2

Also, we thought the exam will end 20 minutes later since it started 20 minutes later so we didn't upload some our answers for like 4 problems (including Q2)....

answers
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    7 days ago, # ^ |
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    for 15, how do you solve in 39+eps moves a graph which is like a star, but every edge is a 49-node chain?

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    7 days ago, # ^ |
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    isnt P11 supposed to be 10?

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      7 days ago, # ^ |
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      yea we screwed up for that one, I just checked again answer is 10

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        7 days ago, # ^ |
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        The statement says that rotations aren't considered different so it should be 1.

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    7 days ago, # ^ |
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    Could you share the solutions in detail for P3 and P11. I got (20C10)² for P3 and 1 for P11.

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      7 days ago, # ^ |
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      Sharing constructions for P11 (if you have greater than or equal 2) would be appreciated as well

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      7 days ago, # ^ |
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      I ran a script for P11 and I think it's 1.

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7 days ago, # |
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Just to let you all know if you didn’t check already that the results are out in the telegram channel!

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    7 days ago, # ^ |
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    Hi, is there an official answer key, I would be interested in knowing the answers for problems 2 and 5 for the free division

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      7 days ago, # ^ |
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      How is p2 not bonus man? (I think the answer should be 3, but there are constructions for 5, 7 as well) So give all three or bonus. How is 3 wrong :(

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      7 days ago, # ^ |
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      The official answers should be published in the up coming days! The reason for the delay is the offline competition!

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7 days ago, # |
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Hello! If we won elementary division, can we also participate for the second advanced round? We want to see how good we will do. Who should we talk to? Thank you!

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    7 days ago, # ^ |
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    First of all congratulations for winning the elementary contest! I mentioned this in our meeting with the Executive Committee but unfortunately it got rejected in the voting since it is against the law which was originally announced! Sorry there is nothing beyond this that I can do, I tried my best to let you in!

    Although we encourage you to try the questions yourself on your own and challenge yourself

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      7 days ago, # ^ |
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      Thank you!

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      7 days ago, # ^ |
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      Is there any way to compete unofficially?

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        7 days ago, # ^ |
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        No, since the competition is based on judging the problems online, we need to use all our human power for the official teams! Maybe what you can do is to write down your solutions and email them to us at the end of the contest, I don’t make any promises but maybe we could mark them for you!

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7 days ago, # |
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Where and when will the results be published?

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    7 days ago, # ^ |
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    The results is already published! Check out the telegram channel! You can find the link in one of my commmets above!

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    7 days ago, # ^ |
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    Also please accept my congratulations! Your team ranked 3rd (not only in Advanced level but Advanced + Free) and successfully qualified for tomorrow’s competition

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7 days ago, # |
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hi, I am a member of the team that participated in the Iranian Combinatorics Olympiad 2024 . However, somehow our team's result is not in the overall ranking results you posted and Can you tell us the reason for this?

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    7 days ago, # ^ |
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    Lot of people with this problem it seems (some of my friends too) which category did you do?

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7 days ago, # |
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How can I know that do I achieve any official award or not?

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7 days ago, # |
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How are we expected to answer the questions tomorrow

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    7 days ago, # ^ |
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    You can either write down your solutions by hand and submit it by scanning using CamScanner or you can submit a Latex file if you prefer, Your solutions must be written in English (or Persian)

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      7 days ago, # ^ |
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      I mean, I don't really know how to write solutions since I've never been in a math contest. Can you provide answers to previous ICO for example to get an idea of it?

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        7 days ago, # ^ |
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        OH, that will make your life a bit tough in this contest if you ask my personal opinion! I am not sure if an official solutions exists on the website (or even exists at all or not) but what I can refer you to is the IMO solutions, you can take a look at them, it should be roughly in the same format.

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          7 days ago, # ^ |
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          I will check them out. Thank you!

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6 days ago, # |
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How to do problem 7?

spoiler
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4 days ago, # |
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aryanv when will the solutions be uploaded ?

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    4 days ago, # ^ |
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    Probably after a week or so the executive committee must upload the official solutions but the exact date is known to me for now!

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      4 days ago, # ^ |
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      Would the final standings be announced along with this? Also is there any scoreboard that has the merged scores?

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        3 days ago, # ^ |
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        I think in the Telegram channels they announced that final results will be available until the end of this Week!

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5 hours ago, # |
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Hello! We are Team Cercetasii. We saw the scoreboard and we got 52.07, but adding up all the 7 individual scores, we get a total of 52.09. What shoud we do?

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