Sir_Edward's blog

By Sir_Edward, history, 5 weeks ago, In English

I was looking at the IOI 2020 results today and I noticed something strange about the scores of a particular contestant, namely, Ana Paula De Sousa Martin. She was unable to get any points on Day 1, but she then came back and solved two problems completely, performing even better than some silver medalists on Day 2.

Fighter. has not performed very well in the last few IOIs. In her best IOI, she scored 25 points. This year represents a tenfold score improvement! The contest took place online this year, so chances for cheating were higher. Honestly, I find this performance very suspicious.

EDIT: Sadly, this contestant was disqualified.

 
 
 
 
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5 weeks ago, # |
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Auto comment: topic has been updated by Sir_Edward (previous revision, new revision, compare).

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5 weeks ago, # |
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Doing well in a contest doesn't imply cheating, bro..

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    5 weeks ago, # ^ |
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    You are right, getting zero from day 1 and bad scores from IOI 2019,2018, then improving overnight and solving hardest question of the day, there is no way it is cheating. You can only achieve it by studying hard! /s

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5 weeks ago, # |
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Hi, DL here,

We understand suspicion, both because this IOI had extra space for it and her participation was "peculiar". We as a delegation tried and keep trying to keep everything fair, the onsite proctor didn't see anything suspicious on-site and we also didn't during our online monitoring. We're waiting for the full videos (we kept the previous onsite video recording requirement for our team) to upload to review them as well. Obviously we wouldn't have any problem sharing these videos with the committee.

Side note: SGP8 also had 200 points on the first day and 0 today, my point is people have bad (very bad) days and good days.

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    5 weeks ago, # ^ |
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    Yes when I have good days I also tend to demolish bunch of CF reds.

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    5 weeks ago, # ^ |
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    Have never been an IOI leader exactly, but from other experience:

    If the delegation and the committee are collaborating well, then a contestant will be disqualified for cheating if and only if they cheated.

    There is no need for either handwavy insinuations or apologetics. The court of the public Codeforce opinion doesn't matter, and one of the sides in the comment section is going to look dumb after this.

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      5 weeks ago, # ^ |
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      (If the delegation does not / cannot cooperate, then things may go differently. IMO examples: who knows what happened with North Korea in Amsterdam, or a certain European country several years before? We will never know.)

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Their last contest performance is remarkable. In rounds #663 and #664 they had gray performance but in #665 they changed their template and coding style entirely leading to a purple performance. Incredible!

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    5 weeks ago, # ^ |
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    how many times do i need to change template to beat tourist

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      5 weeks ago, # ^ |
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      In this case one change led to 800 point performance boost but there isn't sufficient data to establish the rate of diminishing return.

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    5 weeks ago, # ^ |
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    She comments her code in spanish. Seems like it might be a language barrier problem?

    Most "easy" problems on CF are just hideous reading comprehension problems but #665 had nice short statements.

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Hi, I'm a IOI Venezuelan Contestant (ranking pos. 325) The great performance my friend Ana had in the last day is amazing, she was able to overcome the real bad beginning she had (even the best can have a bad day), I know her as real good student, who was EXTREMELY dedicated to this contest over this year, you are doing a accusation (Calling us #cheaters) with no proof at all, she deserves that position and If IOI staff wants to check, I bet they will find everything is clean. So stop causing polemics cause my country leaders worked real HARD to get us there!

EDIT: (Sorry, Actually it turned out to be a cheating situation, I was wrong in trusting this Contestant)

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    .

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    .

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    4 weeks ago, # ^ |
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    is your comment still being valid my friend ??

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    4 weeks ago, # ^ |
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    Well. I was wrong, I gave my trust to this fellow participant but all resulted to be a big scam, I'm glad that the truth come out. Nevertheless I'm proud of the progress of our delegation leaders and my other venezuelan friends who did their best in following all the rules. F!

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if you check her submits, she only sent twice when she got 100 on the two tasks, I'm not saying it is cheating, but It surprises me this kinds of skills

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Hello! I was looking forward to this type of post about this competitor... First of all i would like to remember everyone, that problem Supertrees from day 1 was really accesible for everyone, and even more for someone who could eventually achieve 200 points...

Even in the worst day of your coder life, you would get 10 points in supertrees, no matter how a bad day it is, everyone can agree that with me.

Second, im from South America, in here we had CIIC(Competencia Iberoamericana de Informatica y Computacion, Iberoamerican Competition in Informatics and Computation) days before IOI, in there we also noticed really strange performance by this girl, receiving a golden or silver medal... but didnt manage to make the acusation because we didnt had access to her codes or anything about the competition.

We find really strange and suspicios this behavior, and we would like it to be checken in CIIC so as in IOI. I dont mean to be rude, but in 2018 10 points IOI, then 25 points, and suddenly in a year she manages to be a top latin american coder, and even world top coder in Day 2 of IOI, i dont believe it...

Sorry for not using my actual acount, but im actually scared of the hate i could receive for telling what i saw in this girl and what i think.

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¡¡¡ME TIENEN ARRECHO NO JODA!!!! SEAN HONESTOS JUEPUUUUU.

I would like to highlight a few points:

  • The whole Venezuelan organization was sanctioned in 2016 IOI after they sent two Second Year University Students to participate, "passing" as highschool students. One of them had just returned from the ICPC World Finals and was a member of a very strong team from that year. I cannot confirm or deny this, but it is told that they had a history of doing this in the past. So, they have a history of cheating. By looking at the extensive list of participants here http://stats.ioinformatics.org/delegations/VEN/2020, I see the professor involved in 2016 is there.

  • She got 0 points on Day 1. It was very trivial to get at least 11 points in the problem where its first subtask was to construct a tree. It is extremely suspicious that she was unable to do this, when (basically all) people who she beat at the CIIC did get those points. It is a graph problem. So, on day two, she comes and crushes an even harder graph problem in two equal submissions, right about nearing the end of the contest, hitting PERFECT SCORES in each?

  • She had mediocre participations at previous IOIs and CIICs. So, in her 3rd year, she comes and crushes everyone? Let me see this. Codeforces uses an ELO-like ranking system. According to https://wismuth.com/elo/calculator.html#rating1=1495&rating2=2400, the probability of a 1495 beating a 2400 is 0.000202053. I expect such probability to be similar in Codeforces's system (how many Active reds lose to Green/Cyans in Combined rounds??? Can someone please run the numbers and tell us how many reds and yellows she beat?

She is just a kid, I'm sure. But the whole responsibility should fall under the grown-ups. If they're unable to unequivocally prove her "sudden" genius, they would have destroyed this young girl's reputation (at least among CS peers). If they're unable to proof this, I will personally contact the Ministry of Education of Venezuela and I will throw the Bombshell.

What is the purpose of cheating? Get a medal? Be on TV? Is someone getting money or political advantages in communist Venezuela out of this? There must be a strong motivating reason for cheating.

NoEsLaPrimeraVez #NoALaTrampa

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go to this page (IOI official Facebook page)

scroll until you see the Venezuela team pictures.

the contestant that got 0 points on day 1 and 200 points on day 2 is not even in the pictures.

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The IOI 2020 results were just published, and I am personally not sure exactly what this means.

25eHbt.md.png

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    She was disqualified due to external help. "Cheating allegation from an anonymous source. The leaders contacted the student, and the contestant admitted receiving external help. The contestant was disqualified. The number of official contestants was unchanged. On our side, we see no grounds to indicate that the leaders were involved in the cheating."

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After investigating she confessed she asked for external help during the second day (we knew she had some strong friends so it was our biggest concern), it was informed and yesterday she was disqualified from IOI (it is public now), and from our national competitions as well, we also asked for her disqualification from CIIC-2020, which should be updated soon if it hasn't been already.

Of course you have the right to not believe us but we were pushing for the videos and conversations with her even before the allegations. We were a very small team working on this, and sadly we were not as effective as possible, but still we were worried.

This year's TL(rubmary), DL(me) and one of our adjuncts(sam721), basically started working with IOI this year and, after a lot of work, we went from just 1 or 2 students interested in these competitions to more than 10, which is not much to say but given our history and situation, was a big deal for us. We saw the students go from 0 to learning cool stuff an we were hyped about it. So we are obviously very upset Ana decided to do this and damage a lot of what we build.

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    4 weeks ago, # ^ |
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    Thanks for your hard work and honesty! Good luck on your project! Saludos desde el equipo Informática Bolivia :)

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    Thanks for your honesty! This seems to be a huge lesson for the three of you. I truly believe you deserve a second chance.

    Unfortunately, immaturity, pressure (either from family members, friends, school and society) and whatnot can make young people (and older as well) resort to cheating. Therefore, it is always your responsibility as a Person In Charge to assure their results can not be doubted upon, not even a little bit. I take it that if this bombshell had not been reported to the IOI nor the Codeforces public forum, that she today would be reported with 200 points, just like it was for the CIIC. I say this because you knew of Fighter.'s strong friends by the time of the CIIC, I'm sure it raised doubts on all of you, and yet your all remained quiet. I can even go as far as guarantee that even without knowledge she had strong friends, that her results raised doubts of the three of you. And this would have been so unfair for other students who really sacrificed themselves and put in the work to learn and improve, unlike the cheater.

    I wish the three of you a lot of success in the future Venezuelan National Olympiads, as well as in your future CIIC/IOI participations. Thank you very much.

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    4 weeks ago, # ^ |
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    I am more curious to know if some penalty was also applied to her "strong friends" (or whoever was involved).

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      4 weeks ago, # ^ |
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      Unfortunately, she didn't want to reveal their identities. She didn't want them to be affected, so they remain unknown and therefore unpenalized.

      We tried our best to make her tell us who helped her, but she wouldn't say.

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        4 weeks ago, # ^ |
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        Well, that kinda sucks, does IOI plan to do some kind of investigation? As I see, a person capable of such scores that helps in this kind of thing is way more harmful to the competition.

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          4 weeks ago, # ^ |
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          What penalties could IOI impose?

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            4 weeks ago, # ^ |
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            Everything I am saying is just a assumption. I just assume that the person who helped had access to the problems beforehand somehow, since they said in previous comments that in the onsite videos no suspect behavior happened.

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              4 weeks ago, # ^ |
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              In the previous comment was mentioned that we were waiting for the videos, and we would share them with the committee. She admitted she asked for external help during the contest, but she never shared her videos, so we don't know in what moment happened exactly.

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          4 weeks ago, # ^ |
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          IOI isn't a detective organisation, it can't investigate strangers, and acting on guesses is a bad approach. They're out of luck unless the person who did it comes forward.

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      4 weeks ago, # ^ |
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      Yeah... no more curious than us :)

      They should totally be penalized as well, or at least publicly told on this. Also, of course, it would help clearing us out.

      But as Samuel said, she wouldn't say.

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    4 weeks ago, # ^ |
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    How is it possible to miss the fact that someone has received external help? Are contestants just given free rein to do whatever they want during the contest?

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      4 weeks ago, # ^ |
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      They had to video record everything (the IOI committee removed that as a requirement (bc of legal issues) and I think they left it as a suggestion, we kept it as a requirement for our team).

      Since she couldn't provide the videos, either because she didn't record them at all, or they showed what she did, that probably was what led her to confess what she did. Cause of covid quarentine and she being on another state, proctoring was weaker than what we wished on her site, luckily even in our naiveness, we were very strict with the fact that they had to record the competition.

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        4 weeks ago, # ^ |
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        Wait, so you weren't in the same room? That's crazy. I thought that in every country leaders should watch over contestants for full 5 hours just like any onsite competition (possibly some students in different locations but still with somebody responsible for fairness).

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          4 weeks ago, # ^ |
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          Yes, every student had to be supervised by a proctor during the whole competition, 5 hours straight both contest days.

          We trusted that her proctor would do a good job supervising her but, as you can see we were wrong.

          Given the risks about supervision (like this one) we decided to make the video recordings a mandatory requirement. Sadly, she never shared her contest videos with us.

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            4 weeks ago, # ^ |
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            'Hi make sure you record a video of yourself doing the contest. Oh, we don't actually need to see it live, and if we need to see it later, you can just refuse'

            WTF?

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            4 weeks ago, # ^ |
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            What would have happened if the video shared was taken at a later or earlier date than claimed?

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            4 weeks ago, # ^ |
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            I don't see how she's the one to decide about video recordings. The proctor should be responsible for that. And I think it's obvious that this proctor will be disqualified from any future olympiad organization.

            Unless parents were proctors, that's kind of stupid.

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Auto comment: topic has been updated by Sir_Edward (previous revision, new revision, compare).

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lol imagine cheating and not qualifying any medal even if you didn't get caught

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Sadly, during this quarantine period, cheating in online contests has increased so much. Leaving aside the codeforces rounds which have became common, cheating on major coding contests like Code Jam, IOI are happening, which never used to happen before. This is really a serious thing to worry.

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Her deputy leader said "We didn't see anything suspicious during online monitoring and they re waiting for the videos". Before she is disqualified.

She scored 100 in on go in the last 5 minutes of the contest, 100 in a really difficult problem and 25 additional points. Her help is probably someone that had access to the test in advance.

This girl was probably persuaded/forced to cheat, as the comment in this blog said, for someone to get economical/political benefits in her communist country.I believe this for many reasons, like the fact that Venezuela was disqualified in 2016 and the teacher responsible for the disqualification is part of the delegation of this year and you can not see the photos of this contestant competing in facebook. There is evidence of all this in comments from other people in the blog.

shouldn't Team Leader and Deputy Leader know the skills of their contestants and their potential scores? then why didnt they report what happened in CIIC? she obviously doesn't have those skills to get that medal. Why they didn't notice something weird in her codeforces?

Come on, stop cheating in contest and in real life too.

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    4 weeks ago, # ^ |
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    Funny you say that. Venezuela's first IOI participation was in 2000, a year after Hugo Chávez became President. Venezuela's first cheating happened in 2020, a year after Juan Guaidó declared himself "President". The only other IOI cheater is from Slovenia, whose President is an independent, and which is a far cry from a Communist country.

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      4 weeks ago, # ^ |
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      Remember this is first time IOI is online. And also, Venezuela got caught cheating in 2016

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    "Why they didn't notice something weird in her codeforces?"

    Is there a leader who has read all recent Codeforces codes of their contestants before this IOI? (If you are here, raise your hand so everyone upvotes you!) The point is, I'm not sure why they should be aware...

    If you have credible proof that the delegation of (any country in particular) cannot be trusted by the IOI, please write that up, compile the evidence into a PDF or something, and report that to the IOI International Committee.

    (In IMO, there is the Ethics Committee, which does only this kind of stuff. Maybe IOI should set up something like this.)

    Off-topic discussion: First of all, comments from non-rated non-verified users should really be hidden (as when it's heavily downvoted) by default.

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      4 weeks ago, # ^ |
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      First of all, comments from non-rated non-verified users should really be hidden (as when it's heavily downvoted) by default.

      No.

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        4 weeks ago, # ^ |
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        I mean, there are pros and cons. My argument is that auto-hiding would make people be kinder and post from their accounts more. That would also discourage some high-quality shitposting :(

        What are your arguments?

        The best case would be that non-rated multiaccounts are used only for sensitive information.

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          4 weeks ago, # ^ |
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          Do you really want to censor someone just for being new? Unrated accounts often output high-quality content. What sort of unfriendly website has a user log in, make a post, and see that it is hidden? Those sites do not deserve my content or attention; I close them immediately.

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            4 weeks ago, # ^ |
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            As an example, there are many subreddits that prevent new accounts from posting in an effort to reduce spam and Reddit is a much bigger platform than Codeforces. It’s a trade off. The idea in this comment thread would be friendlier since they’re not preventing new users from posting, just hiding their posts.

            I think cf is a CP platform that happens to have a forum attached so losing some write access to the forum aspect for new users shouldn’t be a big issue.

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              4 weeks ago, # ^ |
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              The "prevent new accounts from posting" is a very poor measure which only serves to protect from the most obvious spammers and shills. Plenty of long-term users produce worthless content on a daily basis, which is not preventable by this filter. In addition that analogy is more comparable to "prevent new accounts from posting on my blog" as opposed to sitewide. The subreddit admins are usually just decided on "Whoever got here first is subreddit admin", so relying on their decisions is a very poor choice, and I think it is not valid to compare platform sizes. If the whole of reddit prevented accounts from posting for X days, nobody would use it.

              Codeforces does not have a problem with spammers and shills, so there is no need to apply this to Codeforces.

              Original comment is a bit off to me. I see some unrated user posts a mildly inflammatory comment and the response is "We need to censor all the unrated accounts". What?

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                4 weeks ago, # ^ |
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                Well, maybe I agree that my original comment should not contain that remark.

                It disregards the argument of the unrated user in an ad hominem fashion, without considering its merits. I will move the remark.

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              4 weeks ago, # ^ |
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              If Codeforces becomes like Reddit, I may as well leave. Reddit often suspends accounts for upvoting wrongthink.

              A better anti-spam measure would be setting links to rel=nofollow for unrated accounts.