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Instead of automatically considering them cheater, any submission that gets enough reports should be reviewed to just make sure those reports were genuine. 3. Codeforces is a project joining people interested in and taking part in programming contests. His friend DAleksa was a tester of a round, so he probably knew problems before the contest. But, I am almost certain that he was cheating. its very mysterious. Also, we don't need to sacrifice the timely post-test rating calculation and change (which is liked by many). :). If Gerald can get several different strings with exactly m distinct characters, print any of them. The teacher was crazy and it was a successful zoom raid.If you want me to raid your class then. If the system continually keeps on hiring cheaters, obviously it's encouraging people to cheat. (ex ban them from participating for 3 months or 6 months.). Even some sort of two-step verification could be implemented: after the first filtering of the trustworthy users, there could be a final check by someone from the codeforces staff (The first filtering phase will most probably reduce the quantity of reports). in this case initialization of variable tp might be delayed until this point, because tp is only used inside this cycle. I doubt someone has so many alts. I think that they should be punished for that. Where is the Pizza? a 1500-rated user solving a 2000-rated problem. We would need to make it harder to create accounts (tie it to govt id, or a phone number), which isn't a popular idea afaik. However, the three submissions seem to be based on different template. All the trouble you got to have a fake CM rank got discarted. For example, if your solution works for 400 ms on judging servers, then the value 800 ms will be displayed and used to . Link govt. First, let's notice that "cheating on Codeforces with the intent of having a better chance at being hired" is the equivalent of "lying on your curriculum". There maybe more. It doesnt contribute anything but pollutes the comment section from meaningful discussions. Currently codeforces is unable to do any sort of report mechanics because of the presence of the alt accounts by many user . I can't suggest anything for first type since we already have too many suggestions for this Better detection, banning groups etc. The String Has a Target. Make Ideone submissions private by default. However, Gerald knows that if he loses more than k characters, it will be very suspicious. My favorite idea was from SHZhang involving running some kind of sting operation against cheating groups, and posting fake solutions for them to get penalties on. If you've seen these problems, a virtual contest is not for you - solve these problems in the archive. Each test case contains a single integer $$$n$$$ ($$$1 \le n \le 10^{9}$$$) the required number of equilateral triangles. I have talked to them too. Codeforces Round #788 (Div. 2)|D.Very Suspicious - YouTube Codeforces. Suspicious submission - Codeforces I am contributing by give reasons why high rated users might not care, which is a part of the discussion. Codeforces Upsolver: #788D Very Suspicious(1670-D) - YouTube Very Suspicious - CodeForces 1670D - Virtual Judge Time limit 1000 ms Mem limit 262144 kB Source Codeforces Round 788 (Div. His performance was amazing in the last round. (Image credit: Getty Images) By Alex O'Brien 20th July 2023. Codeforces Round #788 (Div. The lost part can consist of any number of segments of any length, at any distance from each other. I was lucky, bcs implementation was easy. They dont affect my rank and cheating related blogs pollute the blogs area from discussing algorithmic problems. I think this method will work because a low credibility score would stop anyone from adding there codeforces ID in their resume during job application . Now help him understand this: which suspect lied and which one told the truth? #2 It's hard to deter a cheater if s/he can always create a new handle and cheat to gain 200-300 points more than s/he deserves in just one contest. At least, please don't allow them to test rounds anymore. - (n!/(k+1), Competitive Programming Roadmap (target: [gray, blue]), 00:23:55 C Wrong answer on pretest 5 [pretests], 00:26:05 B Wrong answer on pretest 4 [pretests], 01:07:17 C Wrong answer on pretest 6 [pretests], 01:16:36 D Memory limit exceeded on pretest 1 [pretests]. Does Codeforces have the manpower or the know-how to do all this? Yes I agree to the "mark of shame" idea. The problem statement has recently been changed. After the round based on the user's rank , his score would change . 2), Invitation to SmallForces Monthly Contest #3, Teams going to ICPC WF 2023 (Egypt 2023, 2nd final) WIP List, Atcoder problem statement of F Cans and Openers, How do I get blue in codeforces in 1 month, How to solve http://www.spoj.com/problems/SUMMUL/, Educational Codeforces Round 144 Editorial, UNIQUE VISION Programming Contest 2023 Summer(AtCoder Beginner Contest 312) Announcement, 1569C - Jury Meeting: Not able to calculate n! Let's discuss solutions for catching cheaters - Codeforces I know that this system has also some flaws, like: It is hard to remove cheaters from past contest (if the rating was already calculated, if you remove a single user it affects the rating changes of all other users by some small value). May be alerting participants at time of registering that "no one give you job just because of your rating can reduce number of such cheating cases". 3/4. I think it's officiousness, but I couldn't stop sharing this with you: Orzwzc_, _orzwzc, Orz__wzc, wzc1995, orzwzc1995, orzwzc, Orz_wzc, orz_wzc_. and you can see other users here, now I am suspicious if all 31 handle from North Korea are 1 real person(maybe 1 group of people). For example, if your solution works for 400 ms on judging servers, then the value 800 ms will be displayed and used to determine the verdict. The problem of cheating has been addressed many times in blog entries, many cheaters being reported. Fun idea: Take inspiration from other area, such as fighting cheaters in online gaming. This means that an employer would not hire a user with a high rating but low credibility score because he/she knows that the rating s false and was probably gained by cheating. Codeforces Beta Round 79 (Div. I don't think Codeforces should alert people about such things, especially if it is not a problem in most parts of the world. It is supported only ICPC mode for virtual contests. But only one is telling the truth, thus, the first or the third one is the criminal. Give them some punishment to discourage them. __bilibili the fact that it solves 10/10 problems from pre-2021 and 0/10 of the most recent problems (which it has never seen before) is very suspicious. Find the least number of distinct characters that can remain in the string after no more than k characters are deleted. Another way a user's score would decrease would be if his/her answer is plagiarized and is caught by MOSS . On one hand, Codeforces is a social network dedicated to programming and programming contests. I think you are suspicious as you have created new account just to report this user. Both of them can be criminals, so the second and the fourth one can either be lying or telling the truth. Yes, I saw some users' submission times. Codeforces D. Very Suspicious , 2022-05-09 11:08:51 , , 211 1 .. https: (+2) [0 2 4] [4 6 8] [8 10 12] cnt [i]i ans [i]ians [i] = ans [i-1] + cnt [i] xans. Agree. Bill Gates in one of his AMAs had said something similar too (I don't hold this opinion just because he said it though :P). All caught up! Alex O . I think this could actually be useful in the following scenario: Every time a new contest is proposed, the preparators could add a special test (which is not pretest), and then submit fake solutions to cheating groups which fail only on that specific test. The current system benefits cheaters by a lot and encourages literally everyone to cheat, which makes it not about skill at all. why not directly IP ban, if done consecutively, also lets say X amount of contest happen on codeforces in one month, randomly on one contest there should be rigorous and manual checking with IP BAN, also there should be incentives like CODEFORCES COINS( like if you collect 1000 coins, you will get 10 coins, but both should be from different ip address). Considering the codeforces results in the paper (very poor! This probably causes its own complications (such as the sting group leaking problem hints itself) so I'm not sure if it's actually a good thing to do or not, but it'd definitely be fun :D. I think it is the kind of solution that is really cool but not actually useful. "Some automation to this process could also be implemented: If some user receives a large number of reports, then he will be automatically considered cheater". Here are the codes of A,B and C in #257. Once flagged, the burden of proof shifts to the flagged user to explain why his/her solution is materially similar to another (earlier) solution within 3 days. The first sample has the single person and he confesses to the crime, and Sherlock Holmes knows that one person is telling the truth. Codeforces Problem Solution 2022 - Gupta mechanical Maybe a RED dot (in the contest they have cheated) in their rating graph. Also, no "Codeforces coins" please (whatever they do). Usually, a person use the same template to avoid confusion. The problem statement has recently been changed. They love equilateral triangles and want to create $$$n$$$ equilateral triangles on the grid by adding some straight lines. It can be googled so easily, even worse that Academic record where you only hand it to your employers. 0:00 / 4:46 Codeforces Upsolver: #788D Very Suspicious (1670-D) || Geometry || Binary Search || Math Codeforces Upsolver 215 subscribers Subscribe 210 views 10 months ago Number theory and. To adjust the time limit constraint, a solution execution time will be multiplied by 2. To find out which one did it, the detective lines up the suspects and numbered them from 1 to n. After that, he asked each one: "Which one committed the crime?". ), they might have only evaluated it on recent problems. Whatever the reasons, this is against Codeforces rules. (),n. A newbie or pupil can't solve E or F on his own within minutes. Why does it jump to there? To make the above work even better, Codeforces should also have a system to report cheating, and probably high-rated users can approve those reports (let's say >= 3 or 5 approval) and after that those submissions will automatically be considered as cheated. ( Even if a wrongly accused <= cyan was to get banned due to this.. it won't take them long to make it back up provided they are not cheating ). In most countries, govt issue id card and for countries which don't they should at least be able to link phone numbers via otp. Learn More . I don't know if they do it because they really think others are participating in teams, too, rather than individually, or if they just want to have an advantage over all the other competitors.