wow 
Lmao it’s an honor for me that people are using my name to sell solutions. 
(Just clarifying for any confusion: i am in div1 and this sounds like the menu for div3)
I’d like to report these two
also, for this problem, I’d like to inform the admin that I used previously, publicly available code and slightly modified it. submission. Hope this will not be mistaken as plagiarism
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Too all the people who get demotivated by long challenges i wrote this blog exactly for this purpose so do give it a read, unfortunately cc admin merged my blog with this thread even though my blog’s purpose was completely different 
If you use an already available code than mentioning the link from where you got that code in your program is enough.
I just went through leader board of Div 2 and I was surprised to see almost 90 people having score 710.335 (Despite the fact that this time challenge problem was there).
So it decided to see submissions of few guys and I found many of them has almost same code.
Few examples are:
Check out submissions of rajan9353 , rajan0909, s_amardeep and adi_c0d3.
Dense graph submissions:
rajan9353’s submission
rajan0909’s submission
s_amardeep’s submission
adi_c0d3’s submission
If you see all these submissions carefully then you will find that these submissions either have template changed or variables changes.
Let us discuss about few legends in detail.
Firstly coming on s_amardeep. This guy has made his code unreadable by adding unnecessary code which is known as Code Obfuscation . His logic of code only lies between line 277 and line 316. Code from line 11 to line 276 is just useless.
Now coming to our ultra legend rajan9353 and rajan0909 . I also doubt these two id’s belong to same person because of these points:
- rajan9353’s submission and rajan0909’s submission have only two differences. If you delete rajan9353’s template (which is almost of 347 lines) , then you will find that these are exactly same (only variables are changed).
- Checkout another submission by rajan9353. This submission is same as that of rajan0909.
- Most obvious point both are named Rajan Arora and belong to same college.
I was not gonna write all these things but I was suprised and sad by seeing the amount of effort these guys are doing to cheat. Hope moss is strong enough to detect this plagiarism. Also @admin please take action for Code Obfuscation on rajan9353 and s_amardeep. And action of cheating on all of them.
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Most of the people you complained are from NIT Jalandhar. But a lot of people have got the same score and almost all of them have cheated.
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What procedures does CodeChef follow to detect plagiarism and what steps does it take to address found cases?
I was left with a bit of sour taste today. I participated in this month’s long challenge and was ranked under 200 till today morning. Question 7 “Dense Graphs” had less than 100 successful complete attempts. By the end of the contest at 3:00 pm, within few hours, successful attempts to question 7 had moved to more than 500 successful complete attempts. My rank moved to about 400.
I understand that a number of people might be contributing towards the end of the contest, but to see such an increase in numbers of successful attempts within few hours to a reasonably challenging problem, seemed a bit odd.
I understand the perspective of people who see ranking and rating not as important, but I think when four good companies sit on the contest to hire and when one is looking for a job, possible cases of plagiarism could surely affect adversely.
Would love to get enlightened on the whole topic.
Thanks.
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I know all of them have cheated but I can’t mention all of them here. I just mentioned submissions which I thought are too much. Also I just mentioned 3 people and i don’t think complaining people from same college make them less guilty. Atleast their batchmates and seniors will get to know about their reality.
I never said that complaining people from the same college is wrong. I just put out a fact that most of them are from NIT Jalandhar.
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mail all the submissions to codechef that will help them to work on it quickly.
See no matter how much is done in these questions, how easy are the questions or how many answers are leaked…1 rank will be secured by only one person. Someone has to grab 1st position and someone 1000th even with the cheating. So I don’t think codechef rating are going to be obsolete and even if it will, it will not be due to cheating because number of 5 star coders will always be less and there will be always 1000 coders in top 1000 global rank.
Wouldn’t basic automated verification weed out majority of plagiarized submissions and increase efforts on the part of plagiarizing person to be able to successfully do it?
I think there must be some low-price (or even free) software available to accomplish basic checks.
I’m not active often on Codechef discuss but I thought it would be nice for me to put this out there.
Two of the top global rated participants (I’m talking rank 13-14 top) in March 2021 Div 2 had the exact same score for Wireless Electricity so I got curious and decided to check out their submissions and look at what I found:
User argho001 - CodeChef: Practical coding for everyone
User sahil43210 - CodeChef: Practical coding for everyone
I’ll leave the deductions to you 
Funnily enough, user Sahil with the exact same ID was flagged by @jay_1048576 in the previous long challenge yet it seems that the spree still continues.
I expect people to give the holy speech about not caring about rating yada yada, I’m just using this thread for reporting plagiarism, which was the reason why it was created.
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These solutions for LCKDSAFE
https://www.codechef.com/viewsolution/43846100
https://www.codechef.com/viewsolution/43844602
https://www.codechef.com/viewsolution/43853355
https://www.codechef.com/viewsolution/43843530
https://www.codechef.com/viewsolution/43842049
https://www.codechef.com/viewsolution/43846421
https://www.codechef.com/viewsolution/43841635
https://www.codechef.com/viewsolution/43840676
https://www.codechef.com/viewsolution/43843610
and many more along the line… (div 3 top).
@admin
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Now They all changed the college name and profile pictures! Lolll 
rajan0909 , s_amardeep Earlier all were from NIT JALANDHAR
rajan9353 He changed surname of one ID earlier all names and colleges were same!
I just realised he (RAJAN) and AMARDEEP are core team in CC CHAPTER OF HIS COLLEGE NIT JALANDHAR @admin
Ban this chapter or change team asap CODECHEF
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Admin, checkout all Rank 27 of Div2. Many of them have same code for all the problems lol.
I just checked profile of ritik2900 and rohit4445, who are also member of core team in CC chapter. ritik2900 participated in div 3 and got 57 rank. His Dense graph submission is same as that of rajan9353, s_amardeep, rajan0909. Same is the case with rohit445. His dense graph submission is also exactly same. I think they should rename their group from cc chapter to cheaters chapter. Also fyi, I have already taken their profile’s screenshot. So changing names and profile photos won’t help them.
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