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5 exactly same solutions for LEMOVIE in February Long Contest..!!!

  1. - knb_dtu
  2. - farhan867khan
  3. - skybird927
  4. - adijimmy
  5. - tux

Make new additions for similar solutions here :

  1. - symbiosis

Despite repeated blocking of accounts by CodeChef due to cheating.... some never learn -_- :( ...!!!

asked 18 Feb '14, 21:54

champu420's gravatar image

accept rate: 0%

edited 19 Feb '14, 14:53

admin's gravatar image

0★admin ♦♦

The above solutions are exact copies of my submissions, How have they obtained my solutions and is there any way to prevent it? link to my submissions-,vishalkarve15

(19 Feb '14, 00:36) vishalkarve154★

admin: just check for the timestamp :)

(19 Feb '14, 00:42) adijimmy5★

@vishalkarve15 Did you use Ideone or any other online coding platform? Please send an email to explaining the situation.

(19 Feb '14, 00:52) kcahdog3★

admin : check for symbiosis solution he too has same solution

(19 Feb '14, 00:53) adijimmy5★

@adjimmy According to the time stamp @vishalkarve15 's solution was submitted before yours. What do you have to say about that?

(19 Feb '14, 00:54) kcahdog3★

you can check for my previous submission where i made the mistake of initialising the gloval array for caching the results as 0 where it sholud be -1 i di used ideone before submitting so they may have infiltrated my solution

(19 Feb '14, 00:57) adijimmy5★

@kcahdog yes it was ideone... what should i do?

(19 Feb '14, 01:00) vishalkarve154★

@vishalkarve15 As i said, send an email to and explain why it is your solution and not someone else's.Also send them a link of this discussion. @adjimmy your first solution : code 3417177 was submitted at 9.18 pm while @vishalkarve15 had an AC solution (3417146) submitted at 9.16 pm. Also he had been submitting it from around 5.00 pm so your claim of being the first to come up the solution is is pretty weak. You can send an email to codechef people and try to prove your point.

(19 Feb '14, 01:12) kcahdog3★

@vishalkarve15 Next time please avoid using Ideone and if you have no other option then login and keep your submissions private. It is very difficult to determine who has not cheated and innocent people may get punished at times.

(19 Feb '14, 01:16) kcahdog3★

@kcahdog thanks! :) let's hope for the best

(19 Feb '14, 01:32) vishalkarve154★ is private!!!

(19 Feb '14, 10:01) kunal3614★

@vishalkarve15 >> "yes it was ideone... what should i do?" You should first get a life! And then get something to test code locally. Don't fool around with everyone here.

(19 Feb '14, 11:19) bugkiller3★

@kunal361, yes. sorry. I deleted the old comment so that someone doesn't get confused. It should be private, as it is mentioned in the rules of long contests.

(19 Feb '14, 13:02) logic_max5★

@bugkiller i have checked the submission history for all submissions for LEMOVIE and it is indeed @vishalkarve15 's solution as his submission was the first and he had several previous similar submissions like that. He also wouldn't have come out and confessed that it was his solution in the comments if he was indeed cheating as he was not caught also.I understand that he should have used Ideone safely but calling him a cheater and saying he is 'fooling around' would be unfair to him.

(19 Feb '14, 13:19) kcahdog3★

@kcahdog >> I am not blaming him for an invalid solution or cheating; neither have I called him a cheater. I am asking him to code locally.

in a rude manner

(19 Feb '14, 13:22) bugkiller3★

bugkiller: I don't think "You should first get a life" has anything to do with coding locally. In fact, it's just a baseless insult.

(19 Feb '14, 14:17) xellos07★

Firstly thanks for bringing all these cheating cases to our notice. We are in the process of developing a strict mechanism, which will curb the repeated cheating cases in all our contests. We will soon be bringing in the process and once it is in the practice we will take all the cheating cases since October Challenge 2013 into consideration and will take apt action against all the users involved in any such false practices.

(19 Feb '14, 14:54) admin ♦♦0★

@xellos0 >> I don't care what you think or conclude from that. My second statement did mean about coding locally. Next, whether it's baseless or not I don't know but if it is an insult I will insult such a person who don't care about putting his code NOT PUBLIC. Solving 9 / 10 problems and I don't know if he used public in all his code then it is a serious offense. It's his responsibility to mark it private, in which he failed. Its written in the code of conduct. You're an old member, don't support his negligence. No further arguments from my side.

(19 Feb '14, 15:39) bugkiller3★

bugkiller: "Get a life" has nothing to do with Ideone, marking codes private or this topic overall. For me, it means "get a real life instead of living behind a computer and programming", because that's how it's often used by haters on the Internet. Maybe it's just a bad choice of words from your side...

(19 Feb '14, 19:07) xellos07★
showing 5 of 19 show all


I just opened one page of AC submissions for CHSEQ22 and voila, 2 more cheaters :

kapilsingh13 : solution

himeshkumar90 : solution

I opened their profiles and found that they also have the same solutions for DRGHTS and LMATRIX2. And the best part is they have also cheated for REMISS and KINGSHIP in February Cook Off. All their solutions have been same for all the problems i opened so far.

Found these by just looking at 1 page of AC submissions!! Just wonder how many more cheaters are hiding in the remaining 12 pages!!


answered 19 Feb '14, 00:19

kcahdog's gravatar image

accept rate: 14%

edited 19 Feb '14, 00:29

Here are more for CHSEQ22 in Feb Long...

  1. - guru2691
  2. - lokendra1994
  3. - qwerty1996 ( possibly lokendra1994's fake account )

Some users cheats in every contest. I don't know how they do that . But it affects most of users rank. codechef should handle strictly with these guys.


answered 18 Feb '14, 23:51

unknown_up's gravatar image

accept rate: 0%

edited 19 Feb '14, 09:56

avastpulkit's gravatar image



I have used the same implementation of Union find for HDELIVER in easy( ). This implementation is also in the setters solution. I dont know how the other user's algo is similar to mine

(19 Feb '14, 01:56) guru26914★

Cheaters are cheaters, but those who are claiming that their solutions are genuinely written by themselves. Come on, don't tell me you don't have an IDE or a text editor and a compiler. If you are solving 9 problems out of 10 and you don't have something to test your code locally then its a shame! Don't come up with lame excuses now.

Some users copied a code from ideone, put their name/handle etc details on the top of the code as comment and submit it. ( as mentioned in an answer on this page itself) Sorry buddies that's not how you'll show that you own that code! Get a life.


answered 19 Feb '14, 11:15

bugkiller's gravatar image

accept rate: 9%

edited 19 Feb '14, 13:28

I don't know how much action is actually taken against cheaters. Rating updates are delayed sometimes and it's claimed to be because of removing cheaters, but we see almost identical codes even long after contests. There was a case when a post mentioned 2 cheaters, and several weeks later, it mentioned that no action had been taken against them. Wat?

The first thing to do is unification of rules. A lot is only mentioned in FAQ or Code of Conduct posts, but who'd read that... in fact, who'd read the rules in the problems' page? I know that well: we're lazy and don't want to read boring stuff like that. Nevertheless, it should be all unified. And the rules against cheaters should be especially pointed out among these.

This opens one more possibility: strong punishments. FB Hacker Cup disqualified someone for posting anything about the problems in comments. It was nothing big, but he broke the rules and was disqualified. In this case, just one disqualification is weak: temporary/permanent ban. Or IP ban, or subnet ban (which is not a good idea, though :D). Something that'd teach people that if they cheat once, they won't be given a chance to do so again for a long time.

Most importantly, the submit needs a bot which'd scan any submitted/accepted (pick one) solution against other ones (during/after the contest, pick one again) and if it detects excessive similarity, report (or outright disqualify/ban) the user in question. It doesn't seem that hard to do.

Also, it'd be good to publish a list of proved cheaters for every contest. Something like a Hall of Shame.

Although with the way things have been going (or standing), I doubt Codechef will ever give any regard to these ideas.

EDIT: This is off-topic, but it's also a change that should be made. Comments should give karma if upvoted. Maybe less than answers, but still, they should give karma. Sometimes a comment is much more useful than an answer.


answered 19 Feb '14, 19:34

xellos0's gravatar image

accept rate: 10%

edited 19 Feb '14, 21:59

You missed that comment from @admin probably...

Firstly thanks for bringing all these cheating cases to our notice. We are in the process of developing a strict mechanism, which will curb the repeated cheating cases in all our contests. We will soon be bringing in the process and once it is in the practice we will take all the cheating cases since October Challenge 2013 into consideration and will take apt action against all the users involved in any such false practices.

(19 Feb '14, 19:51) betlista ♦♦3★

I don't know what will or might happen, but fact is that specific pointed out cheaters were not disqualified for several weeks at least. With that kind of negligence, I don't trust future tense.

(19 Feb '14, 19:57) xellos07★

I agree, if those users are not punished, they will do it again and again and again...

(19 Feb '14, 20:01) betlista ♦♦3★

Here are 2 more users with the same codes as lokendra1994, guru2691 and qwerty1996 for for CHSEQ22 :

1) nabonidus : solution

2) abcd12349 : solution

Infact 5 out of 9 users with run time of 0.00 have exactly the same code.Looks like another case of Ideone leak.


answered 20 Feb '14, 22:06

kcahdog's gravatar image

accept rate: 14%

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question asked: 18 Feb '14, 21:54

question was seen: 5,582 times

last updated: 20 Feb '14, 22:06