https://ioi2021.sg/ioi-2021-tasks/

IOI 2020 preliminary results are now available at IOI Stats. Please note that these results are not yet final and are subject to change.

Day 2 tasks statements are also now available at IOI 2020 website.

Day 1 preliminary results are available now at IOI Stats. I did not allocate any medals to avoid confusion (since these are only Day 1 results), but the ranks should be accurate, so please use them for estimations. All contestants on that page have at least one submission.

IOI 2020 Day 1 tasks are also now available at IOI 2020 website.

So there is a possibility that IOI 2020 will see honourable mentions. As such, I need to add it to IOI Statistics. Which means I need to pick a colour representing honourable mentions. I have a couple of ideas in mind, but really, they all seem kind of random to me.

So I decided, oh well, why not, let's ask for opinions here and see what happens. So if you have an opinion on what colour should be used, please post it here alongside the argumentation for it (even if it is silly).

That will increase my pool of colour choices from 3 to a ridiculous amount, which will hopefully make the whole colour selection even more random. Profit.

P.S. It has to be light enough to make it feasible to use as a background for black or dark blue text.

P.P.S. IOI 2020 participants' list will drop tomorrow.

Please see the announcement from IOI President Greg Lee:

Dear Friends of IOI,

We trust that you are managing well during this difficult period as the world fights the global COVID-19 pandemic.

The IC of the IOI held their 3rd online meeting on 6th June. We have the following important updates to share with the community.

First, IOI 2020, organized by Singapore, will be held online around the end of September 2020. We are in communication with organizers of IMO 2020, which is now moved to an online competition on 21st and 22nd September 2020. The IC, along with the Singapore host organizers, are still working out many details, including technical and execution, concerning this special online IOI 2020. We will keep you updated as more information becomes available.

Secondly, IOI 2021 will be hosted by Singapore onsite, from Sunday, 20th June 2021 to Sunday, 27th June 2021. We are presently in communication with the ICPC Headquarters who have postponed their ICPC World Finals 2020 to Wednesday, 23rd June 2021. We are scheduling our activities so that the actual IOI 2021 contest days, being on Tuesday, 22nd June 2021 and Thursday, 24th June 2021, are not concurrent with the actual ICPC World Finals 2020 contest day on Wednesday, 23rd June 2021. At any rate, there are no students who can qualify for both IOI 2021 and ICPC World Finals 2020. Unfortunately, some IOI committee members and team/deputy leaders may also be involved with ICPC World Finals; we will work together to support the affected individuals.

If you have any questions or suggestions, please contact the IOI Secretariat at secretary.ioinformatics@gmail.com.

Stay safe and best wishes,

Greg Lee

IOI President

Please see the e-mail (sent to ioi-announce@) from IOI President Greg Lee:

Dear friends of IOI,

Just a quick update from the IC concerning IOI 2020 and beyond. The IC held an online meeting yesterday on May 25. After some discussion, the following plan was approved unanimously:

1. IOI 2020 will be held online. Detail will be forthcoming soon.

2. IOI 2021 will be hosted by Singapore (originally by Egypt).

3. IOI 2024 will be hosted by Egypt.

Thanks to the dedicated work by the Singapore host team, all possibilities for an onsite IOI 2020 were explored. Unfortunately unpredictable outlook of COVID-19 forced us to move the competition online. Furthermore, thanks to Eslam and the Egyptian host team for switching to host IOI 2024 so that Singapore can host IOI 2021 onsite.

With the move to an online competition, many working details will need to be discussed by IC, ISC and ITC. We will keep you all updated as more information becomes available. If you have any questions or suggestions, please contact the IOI Secretariat at secretary.ioinformatics@gmail.com.

Stay safe and Best wishes,

Greg Lee

IOI President

I wanted to share several updates related to IOI after the International Committee meeting in February in Singapore.

1. As was e-mailed to ioi-ga@ earlier today, there is a proposal from IC to introduce Honourable Mentions at IOI 2020 pending GA approval at GA1 of the IOI 2020. After lengthy internal discussion about various formats, the chosen one was “For those contestants who do not receive medals, the score necessary to achieve an Honourable Mention is the largest score such that at least 70% of all contestants receive either a medal or an Honourable Mention”. This means that without changing the current IOI medal structure, about 20% of all contestants will be acknowledged with Honourable Mentions. Again, this is all subject to GA approval.

2. There was a discussion about the ongoing situation regarding COVID-19. Please refer to updates at the official IOI 2020 page.

3. IC has formally approved the new logo of the IOI. It isn’t dramatically different, but the unavailability of the original logo in high-resolution or vector formats was forcing many in the community to re-create the original. The hope is that this will no longer be necessary and the logo in various formats can now be downloaded from IOI official website.

4. After making the survey during IOI 2019, we have now updated the contact information (website and contact e-mail) for all the members (apart from a couple of countries, where I’m still trying to obtain the information). It’s available at the official IOI website. I have manually checked that all websites are working last month.

5. Pages on various social networks (Twitter, Facebook, Instagram and YouTube) have been created for the IOI. The links to them are also available at the top-right corner of the official IOI website.

The draft of IOI 2020 rules is now available.

This has been approved at IOI 2019 GA, since there was a desire to know major rule changes a year in advance. To allow flexibility, some minor changes are still possible, and the final version will be as usual presented at IOI 2020 GA.

IOI 2019 website is now live.

The proposed IOI 2019 rules are also available. The most notable change is the removal of live feedback on overall scoreboard used at IOI 2018. Please note that these rules need to be approved at IOI 2019 GA before they will take effect.

Registration for the Google Code Jam 2018 is now open.

Also, there are some pretty big changes for this year as they have a new system to compile and run code themselves. Kind of really sad for me, because the ability to submit the code in any language you want and the multilanguage leaderboards were what made the contest unique in my eyes.

During my competition history I've collected a vast amount of different fail stories. And those usually come in two flavours. You either get an aftertaste of a personal failure or you get a feeling that you were helped by organisers in your adventure. And it's always helpful to try and learn something from these failures. The first ones are kind of personal, and only affect you or your team, so they are not that interesting to talk about. The second ones however are more important. First of all, this is a direct feedback to the organisers, in hopes that it might make future contest better. And then you usually try to use that feedback yourself when you move on the organisers side in an attempt to make sure that you avoid setting all those pitfalls that you were annoyed about when competing. So here I'm going to try and describe two types of pitfalls that in my opinion the organisers can deliberately or accidentally set that helps teams to embark on a wonderful journey to fail-land a lot easier. This was originally intended to be a comment about Bubble Cup problem set, but since I've realised that the problemset contained great examples for both of these pitfalls, I've decided to post it separately to enable discussion.

The results of IOI 2016 have now been approved by the GA and are now available.

The number of contestants and cutoffs have now been confirmed at GA, so here are the results of IOI 2015.

Not that I have any chance of going to onsite finals but does TopCoder expect that all TCO 2015 Round 3 advancers request a visa invitation letter just in case?

Source, full-size image.

The official participant list has been released in the IOI Database (list of contestants, list of delegations).

The data is obtained from the IOI registration system and is accurate at the time of writing. Should any changes/additions occur, I will try to update them in the timely manner.

Where applicable, the photos of the participants of IOI 2015 are also available. Note that permission is required in the registration system to publish any contestant's photo, so where no permission was granted, either a photo from previous IOI(s) was used or no photo is available at all. Again, more permissions may be granted in the future and I will try to update them in the timely manner.

Finally, I have also pulled Codeforces handles from a thread by Azret. I would like to thank him for maintaining it. For the rest of contestants, please feel free to add those in the database if you have such knowledge.

Is this a bug, feature or am I a Slowpoke (see first column)? If this is a feature and now contestants become unrated if haven't written a contest in a certain period of time, then what is this time interval?

So, the qualification round was upon us, and it's a nice way to have some fun. In the past two years I've been writing solutions in multiple languages. In both of them I used Excel for one problem. Without any use of VBA of course, as it would've been too boring. This year I decided to go nuclear and use Excel for everything. I managed to get 100 points. Here are the notes on this glorious experience.

A reminder that today at 21:00 GMT the second round of Facebook Hacker Cup 2015 is taking place. After first round last weekend 732 contestants are continuing the battle. Top 100 from the second round advance to the third, while top 550 receive T-shirts. The round will be 3 hours in length. For contestants the tasks will be available here, while the standings — here.

UPD: Round is over, provisional results have been published. Cutoffs:

• Advancement to Round 3: 55 points (A+B+C) with time ≤ 2:21:53
• Facebook Hacker Cup 2015 T-Shirt: 10 points (А) with time ≤ 30:23

Today i stumbled upon this post. In this case, judging from comments, I can guess the original contents of the post fairly well. However, the general idea got me thinking — why all the history of comments is preserved, while the history of posts themselves — don't?

IOI 2014 complete data is now available in the database.

The live video feed for IOI 2014 is now available.

Since IOI 2014 participant list was released in mobile app a couple of days ago, I have processed it and it is now available in IOI database.

Almost all Codeforces handles were also imported from thread by accidentallygivenfuck — thanks to him for maintaining it!

Finally, the participant list now marks golds with 1st — 5th absolute ranks as such and sorts them appropriately.

UPD: It turns out that the information in the mobile app was incorrect/outdated. The database was updated. Contestant-wise, serious changes were made in teams from Colombia and Egypt.

And while everyone is relaxing after TopCoder, I would like to remind that today at 21:00 UTC the Round 2 of Facebook Hacker Cup 2014 is taking place. It will run for 3 hours. Top 100 advance to Round 3 and get a T-shirt.

As a reminder, today at 16:00 UTC there will be TCO 2013 Round 2C. Top 50 will advance to Round 3. Top 117 guarantees a T-Shirt. Everyone, who has already advanced, can take part in Parallel Round. Good luck!