Find the least number of distinct characters that can remain in the string after no more than k characters are deleted. The second line contains the number k (0k105). If we do make the next few rounds of cheaters unrated, they won't be able to gloat about it and it'll have a direct cost attached to them since they won't be able to gloat about their ratings for the next month or so. I am not seriously involved in chess, so I don't know how well that stuff actually works there, but I've heard that modern online chess are already relatively good at detecting suspicious users (e.g. IMHO, it is obvious! 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. The first line contains two integers n and m (1n105,0mn) the total number of suspects and the number of suspects who told the truth. Maybe they don't register at contest by themselves. However during contest the amount of requests is very large and I suspect at least the delays will become quite sensible. More than half of participants are Indian now-a-days and more than 90% of them do it only for job. However, Gerald knows that if he loses more than k characters, it will be very suspicious. And on the other hand you may accidentally ban everyone from some dorm. Codeforces Solution | Codeforces Problem Solution 2022. Maybe there is an important operation in the part between! Thenttest cases follow. due to posting doubtful content by users) then switching to HTTPS will force internet providers in such countries to limit access to . How about asking every user to add a phone number to their CF account? 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! Hemose on the Tree Codeforces Solution | Codeforces Problem . This step can itself weed out a lot of real cheaters since they will be more reluctant to respond and they will have very little to explain. Though, I don't think you should call non cheaters "less clever", thats sad. Mike should assign some people who can give judgment of these cheating claims. 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! There are 2 or 3 different code style in submissions of those handles. [Codeforces] Round #788 (Div. And also birthday, to avoid collisions (there are too many cheaters from one specific country, only names are not enough). How to see whether it was a TLE or WA or some other reason? Now help him understand this: which suspect lied and which one told the truth? They want to increase their chances of getting into a place which has a high rejection ratio. 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 . :). n,,n1,. I agree, however we all know that this is a competition, and the feeling of getting more points than my competitors make the whole experience more fun. He has 1728 solved problems and is CM, he doesn't need to cheat to perform good in a Div. The proper way on deciding the amount of change in credibility score would be decided by the admins. if i wanna do cheat, except this cheat i will use 2 handles cause of dont take wa in pretest , but this people takes wa in pretest (they are noob cheaters :D), but dont forget change something in code, if u didnt it will be skipped :D, The only programming contests Web 2.0 platform, http://codeforces.com/contest/449/standings, http://codeforces.com/contest/449/submission/7162064, http://codeforces.com/contest/449/submission/7164450, http://codeforces.com/contest/449/submission/7168442, http://discuss.codechef.com/questions/45900/north-korean-participants-competing-in-teams, Educational Codeforces Round 152 Editorial, How to use Centroid Decomposition to solve IOI 2011 RACE, Editorial of Codeforces Round 889 (Div. North Korean participants usually take part in contests as a team under ONE handle. Once you grow up, you'll learn that the world doesn't revolve around you. Probably some similar solution to the one posted above was also posted before, but I cannot remember. The string should have exactly m distinct characters. They love equilateral triangles and want to createnequilateral triangles on the grid by adding some straight lines. don't tag me if it's not related to me -_-. I think publishing the cheater's names and handles in a high viewed blog post or a separate "leaderboard" is the way to go. 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). Or, for example, I'd be interested to know motivation of a contestant from, let's say, Egypt, who suddenly decides to use Polish words for variable names in one of their solutions. A similar issue was brought up in Codechef a few months ago http://discuss.codechef.com/questions/45900/north-korean-participants-competing-in-teams. The only programming contests Web 2.0 platform. (ex ban them from participating for 3 months or 6 months.). Can I view the StopStalk code? I could be terribly wrong here. Mar 14 So. There is simply no way jobs created are going to be able to match up with the rising population. Fun idea: Take inspiration from other area, such as fighting cheaters in online gaming. Learn More . We blacklist accounts which seem . They love equilateral triangles and want to create $$$n$$$ equilateral triangles on the grid by adding some straight lines. First of all, he didn't even compile his code locally. Considering the codeforces results in the paper (very poor! Most cheaters want high ratings to show off to recruiters/ put on their CV/university applications. 2))CF24A. 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. Also, the suspect could say so about himself (ai=i). Maybe making a compulsion for the users to mention their name and country and having a verified email address (even when someone changes it) would help a bit too (since it may make it a little less easier to create alts). Devoted u successfully. Yes, I saw some users' submission times. (He solved in order ADBC). Suspect number i answered either "The crime was committed by suspect number ai", or "Suspect number ai didn't commit the crime". In the third sample you are given a line whose length is equal to 8, and k=10, so that the whole line can be deleted. Many coders use "template" , on which they write codes. They are really proud of their Codechef performance. Catalog. It's probably impossible to have perfect solution for catching cheaters. What about someone who is at 2000 rating or so? 2. There is a feature to hack solutions (produce a test case which makes the code fail), but I am not aware of a feature to report plagiarism in contest. The only programming contests Web 2.0 platform, Educational Codeforces Round 152 Editorial, How to use Centroid Decomposition to solve IOI 2011 RACE, Editorial of Codeforces Round 889 (Div. I there is a large positive variation between the seed and rank , his score would decrease. Let's discuss solutions for catching cheaters. Often IP addresses are so dynamic that you can circumvent the ban without doing anything. Maybe a RED dot (in the contest they have cheated) in their rating graph. At least, please don't allow them to test rounds anymore. Coming to the implementation, The score would be implemented using the seeds decided before the round. The string consists of lowercase Latin letters. Solution Click Below:- CLICK HERE ~~ Praying for my contribution ~~. The package for this problem was not updated by the problem writer or Codeforces administration after we've upgraded the judging servers. As you see, there is a line written this: If n = k, then the code must get RE because of division by zero. A big issue is then using somebody else's credentials as a joke. In the second sample you are allowed to delete 4 characters. Where is the Pizza? What are your thoughts about the solutions that can actually be implemented in order to find and discourage cheaters? As Sherlock Holmes was investigating a crime, he identified n suspects. I just dont want to see and care any of these. In the first and second test cases only 2 lines are needed. Similar to what leetcode has. These reports could be handled by some trustworthy members of the community (high rated/contributing users). Codeforces Solution | Codeforces Problem Solution 2022, Very Suspicious Codeforces Solution | Codeforces Problem Solution 2022, Hemose on the Tree Codeforces Solution | Codeforces Problem Solution 2022, Jee, You See? (Image credit: Getty Images) By Alex O'Brien 20th July 2023. That's why I said feature request. 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. If you've seen these problems, a virtual contest is not for you - solve these problems in the archive. Also, he made his first submission to problem D, just 1 minute after his submission to C. Also his codes are a bit strange. I can't suggest anything for first type since we already have too many suggestions for this Better detection, banning groups etc. My suggestion would be implementing a credibility rating . Follow Me. YouStill_DontKnowMeYet [GYM] Al-Baath Collegiate Programming Contest 2023 ACD Ladders [A code daily ladders] The lexicographically minimum permutation subject to interval constraints ? Fall Guys secretly adds "Cheater Island" where hackers are forced to play against each other. - (n!/(k+1), Competitive Programming Roadmap (target: [gray, blue]), I'm advocating for harsher penalties, including: 1) Lifetime ban or two strikes out, 2) Reset rating to 1,200 whenever cheating is confirmed, 3) A badge of "Suspected Behavior" for 6 months. Codeforces feature request 2: Report button for every submission like this blog suggested. How the code passes 19 th test case 1 1 1 1 1 1. in my pc it gets RTE!!! The first input data line contains a string whose length is equal to n (1n105). Print "Lie" if the suspect number i lied for sure and print "Not defined" if he could lie and could tell the truth, too, depending on who committed the crime. After adding the first line, no equilateral triangles will be created no matter where it is added. All caught up! I've only been doing CP with some seriousness since August, but it's the first time I've heard of such a widespread occurrence of cheating. It would be displayed on the user page and would be a score between 1 and 0 . But if he did not solve A and B simultaneously, he solved problem A in less than 2 minutes! One thing to consider is the people who cheat mostly have low ratings. System Crawler 2023-06-30 lemon88 2022-11-21 Very Suspicious I have looked through assembly code generated by the compiler and I think I've found the reason. Creating such a test and (slightly but not obviously wrong) source code depends from problem to problem, but in general I think it is achievable with minimal effort. I do remember some more handles doing this, like RNS and RNS_MHB. I have solved 1454E - Number of Simple Paths, a 2000 problem by myself when I was rated 1481. Anyways there are my thoughts and would love to know what the rest of community would think about this . I think that they should be punished for that. However, someone accustomed to CNOI-mode contests tend to work on many probs at once and submit them in the end. Any one of them can be the criminal, so we don't know for any of them, whether this person is telling the truth or not. P/S: Not sure if I'm gonna get downvoted by cheaters for this. By ReportingCheater , 23 months ago , Today I noticed weird performance of wxhtzdy. So, who is the one providing them solutions?. 2) D. Very Suspicious, [Codeforces] Round #788 (Div. ), they might have only evaluated it on recent problems. 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. The teacher was crazy and it was a successful zoom raid.If you want me to raid your class then. Submissions Contests ReportingCheater's blog Suspicious performance of the user. 3/4. Newton Schools students are already working in more than 150+ top companies of India including Zomato, Unacademy, Deloitte, Nutanix, etc.To watch more videos on programming, Data Structures, Android Development, Data Science, C++, Java, React, subscribe to our channel.- - - - - - - - - - - - - -If you're reading this far down, hello, you look nice today :)#NewtonSchool #NS #Fullstack #FSD #Datascience #MS #Postgrad #webdeveloper #programming #programmer #programmers #developer #coder #programmingmemes #coders #coding #frontenddeveloper #backenddeveloper #html #softwaredeveloper #hacking #python If Gerald can get several different strings with exactly m distinct characters, print any of them. That means that this person is telling the truth. Yes, the cheating discussion concerns me right now. this assumes that the large cheating groups are the primary issue though, as opposed to small rings of cheaters. but the line int tp = (sa-sk) % (n-k); does not lie inside the body of the for loop, so the code should get RE! 1 + Div. Finally, after a user's participation in a contest has been decided as cheating, I think some action must be taken (beside just eliminating him from that contest). In round #216, I tried to hack this code. (Because companies also know that there's a lot of cheating in online Competitions, they aren't blind.). The only programming contests Web 2.0 platform, Educational Codeforces Round 152 Editorial, How to use Centroid Decomposition to solve IOI 2011 RACE, Editorial of Codeforces Round 889 (Div. I saw entry about this guys. Here are the codes of A,B and C in #257. This way alts will not be created and cheaters would have fear. if there is 2 copies of the conditionals, the first means do we need to start the cycle. 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". 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 lost part can consist of any number of segments of any length, at any distance from each other. Solve more problems and we will show you more here! Please don't do this, alt accounts still are a thing y'know. when I say large number of reports, I mean large, like 100 or so. Probably some high rated people. Then they will not be able to show off their ratings to their recruiters. 1 Only) Finished: . I didn't know that! This may actually replace the need of a phone number check or something. PS. However, it seemed to me that few solutions were actually given. Codeforces. RT @cHHillee: So. Where is the Pizza? The problem statement has recently been changed. But I have few suggestions for second type. Each candidate could be judged by skills required for that specific job by asking to do a small project, conducting face to face interviews, etc. Here are some additional ideas of finding the balance: Introduce automated check, but add additional filters to reduce false positive, including: 1) only applying automated check on harder problems (for example, after Div1C/Div2D), 2) only flag when the solution suspected is way out of league of a user's rating (a 1500-rated user solving a 2000-rated problem). if a suspected user responds, then a panel of trustworthy members can vote based on evidence. Similiar to contribution, a submission reported by higher rated users should also receive higher number of reports. Those rounds were quite good. Hello guys, new video here with some bakchodi in online class. Toggle site. but those who do cp because they love it will not be demotivated. A high rating would mean that the user has not been caught or suspected of cheating. if this line hadn't been commented out, i think the solution would have been accepted. Is cheating generally enough of a problem to warrant it? "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". 16 Mar 2023 00:33:11 Virtual contest is a way to take part in past contest, as close as possible to participation on time. This will certainly discourage you to create a new account and cheat again. It can kill someones love for CP if you're wrong. 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. There were several solutions proposed in comments, but I don't remember in which blogs they were posted. I doubt someone has so many alts. A very very hard problem (need help) How to solve this problem? . Downvote if you find this absolutely irrelevant, but I wanted to speak about this since a long time and did that today. 3/4 Horace He @cHHillee later it will be overwritten, previous value does not matter. NEWTON SCHOOL is your gateway to a high-paying tech career in 6 months with Zero fees till placement, transforming you into a rockstar full-stack developer earning 5-40 Lakh per annum salary. (), n . Amazing!!!!! 2) C. Water the Trees [Codeforces] Global Round 20 D. Cyclic Rotation But if we can have light-touch enforcement and rigid penalty in place, we will most likely live with much less cheating happening without detection. Yet nowadays defamation, if someone really wants to do so, is always possible by setting up a new account, get it to Orange++ then cheat / post some stupid things then get banned. I think perma ban is an idea that seems good in theory but is terrible in practice sites that implement this end up with some people who consistently create new accounts and have no attachment to them. One may argue that I shouldn't care about my positioning, and that I should care only about my learning and self-development. Givenn, what is the minimum number of lines you need to add to create at leastnequilateral triangles as described? The only programming contests Web 2.0 platform. It's about survival of the fittest, getting ahead of the competition in most cases. I think that you are just stupid monkey that can not do something difficultier than just writing stupid posts. You also have to find any possible way to delete the characters. Hello Friends my Name is Mohit Gupta. Instead of a user improving his/her score , the score would heal automatically over time i.e. O.o. The package for this problem was not updated by the problem writer or Codeforces administration after we've upgraded the judging servers. Agree. It really beats me how a talented bunch of people cannot realize that this is not a team contest. I couldn't find an actual suggestion in your spoiler just a few would-bes. But, I am almost certain that he was cheating. I am just seeing HACKED in verdict . StopStalk rating is determined by a very unique formula which takes care of number of solved problems, maximum streak, accuracy, per day changes and effort . The problem statement has recently been changed. If someone is caught cheating, say more than once (it is hardly a coincidence if someone is caught unintentionally plagiarizing twice or more) then maybe their accounts can be disabled/closed with a "mark" on their profile which states the reason why their account was closed. To adjust the time limit constraint, a solution execution time will be multiplied by 2. when it comes to here:for(int i=k+1; i<=n; i++) because k+1>n so the pc will ignore the body and jump to next. However, as Gerald is too lazy, he has no desire whatsoever to learn those letters. If you just want to solve some problem from a contest, a virtual contest is not for you - solve this problem in the archive. Slim Codeforces Solution | Codeforces Problem Solution 2022, Dorms War Codeforces Solution | Codeforces Problem Solution 2022, Where is the Pizza? The first line contains a single integer $$$t$$$ ($$$1 \le t \le 10^5$$$) the number of test cases. Next n lines contain the suspects' answers. 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. Make rating private only the user will able to see it and not able to share it. ,.().,. a 1500-rated user solving a 2000-rated problem. They dont affect my rank and cheating related blogs pollute the blogs area from discussing algorithmic problems. RT @cHHillee: So. Sherlock Holmes understood for sure that exactly m answers were the truth and all other answers were a lie. On one hand, Codeforces is a social network dedicated to programming and programming contests. However, Gerald knows that if he loses more than k characters, it will be very suspicious. His friend DAleksa was a tester of a round, so he probably knew problems before the contest. If he prooves he is not cheating (if he is using 3rd party code for example) the contest gets rated for him, otherwise he gets permanetly banned, and possibly a "mark of shame" on his profile name. We can still keep the current practice but only change the offender's rating as an offline penalty. 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! The String Has a Target. I could be going overboard here, but I think the way the press covers it in this article is just to safeguard an ulterior motive (which is to win every contest). This is enough reason to not do that. Someone solves the problem and shares his code with his friends/telegram group. 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). Codeforces feature request 1: A way to test given testcases on problems page so that less users are forced to use online compilers. If there are already enough people who got this belief from somewhere, to me it sounds very optimistic to hope that such alerts will make people change their mind. They have not submitted their team name, but I assume there will be kutengine. This is a talk by the creator of Lichess, he talks about how they handle cheating around 17:50. 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. It doesnt contribute anything but pollutes the comment section from meaningful discussions. Just like hackerearth, topcoder has their own compiler and run button for given testcases. I don't know, it fails on my compiler too. Without it this solution gets RE on test 1 1 1 1 1 1. As a community member, I simply dont care about your egotistical opinion. No better deterrence than public humiliation. Codeforces Round #788 (Div. Each test case contains a single integer $$$n$$$ ($$$1 \le n \le 10^{9}$$$) the required number of equilateral triangles. However, what is "obvious" would be needed to be carefully defined, and there should be some human involved if the blocked account has a more or less long history. Now, imagine you got caught. Never use someone else's code, read the tutorials or communicate with other person during a virtual contest. For example, if a user is seeded 6000 but attains a 3000 rank his score would take a hit . 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?". Print n lines. Also, his friend joccccca got from newbie to high expert in three contests (Believe or not, all those 3 rounds were tested by wxhtzdy). Telegram Link of Channel:https://t.me/CPEditorialsTelegram group Link-https://t.me/+IicFB7l0Bdg2Yjk1LinkedIn-https://www.linkedin.com/in/ujjwal-ranjan/Instagram-https://www.instagram.com/ujjwal_14_ranjan/ Newton School's - https://bit.ly/FullStack2022Newton School Official WhatsApp Support Number: +91 6362 331 200-----------------------------------------------------------------------------------: : https://www.linkedin.com/school/newto: https://www.instagram.com/newtonschoo: https://www.facebook.com/newtonschool.co-------- --------NEWTON SCHOOL is an online Edtech company providing the highest-rated FULL STACK DEVELOPMENT PROGRAM for professionals, graduates, and women. The problem of cheating has been addressed many times in blog entries, many cheaters being reported. Please don't speculate. That should at least be raised to 2400 because it is possible for a 1500-rated person to solve a 2000 problem. Codeforces Solution | Codeforces Problem Solution 2022. People will think twice before cheating and whenever a cheater gets caught, he will then have to use a new phone number when creating a new account and will eventually have to stop, and this will also limit the number of alt account (like this one lol).

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