Cheating

The main difference between a TEXT solution and a precomputed solution is that the TEXT solution must have used exact knowledge about the contents of the judge data.

The submitter of TEXT knows exactly what the judge output lines are and their relative order. The precomputed solution does not rely on knowledge of the judge data, since the user is reading the input and producing corresponding output. It also uses a list of all possible cases, not just the ones in the output file. The user may have used a slow/suboptimal solution to come up with the precomputed values, but it is still the user's own solution (unless you have proof otherwise) and can not be called cheating.

Frankly, I don't understand why TEXT is selected by default in the list of allowed languages in the problem editing page. Except for a few rare and unconventional problems problems (e.g.problems with no input like BCEASY), I see no way that someone could submit a TEXT solution and not know anything about the judge output.

DOC, PDF and PS are deselected by default, maybe deselecting TEXT is also a good idea to prevent cheating.

spoj.pl/users/humblecoder/13
I think this person is cheating.

He is i think submitting judge solutions, which does a lot of discredit to those who solve hard problems with a lot of effort.
What is noticeable is that he is solving hard problems from COCI and University of Ulm contests (infact he has solved entire sets)
However he cannot get easy problems like KROW and BISHOPS.

How i noticed this was that person was submitting solutions very fast, i think he solved 3 COCI problems in under 20 mins (which is hard even for strong coders). Consequently i emailed him asking him for a hint to POLQUERY to which he said... he used DFS to check for connectivity... which is naive and will not clear the tests.

I request the problem setter (vdmedragon and AdrianKuegel) to look into the solutions and take appropriate action if found guilty.

He submitted judge solutions for several problems.

At the moment, the function to disqualify the solution doest not work well. I cant disable his submissions.

I did not find his email to suggest him to disqualify these judge solutions himself.

give me a private message.

Thanks.

Yes, humblecoder need to be kicked out from SPOJ.

humblecoder disqualified himself these submissions.

You can find more here, spoj.pl/users/humblecoder/11

Before: Current world rank: #146 (64.1 points)

I am the problem setter of KOPC09. His submissions for problems RAINBOW, KGSS, PROOT are judge solutions.(I saw only these problems in his profile)

EDIT: Now he has disqualified his submissions for Ulm contest and KOPC problems.

Hello,I doubt that this guy is cheating spoj.pl/users/macedonian_boy/2

what makes me dubious when I notice that this guy is submitting solution too fast which is virtually impossible for any coder to solve in that time gap. Take a look at this : spoj.pl/status/macedonian_boy/signedlist/4

I request the concerning problem setter/administrator to look into his solutions and take appropriate action if found guilty.

You're right and I know, what he is doing: He found out where he can get amaroq's solutions from the web and now he is submitting them one after another ...

Hello numerix,yes you are right,just see his rank now #30 .

I like to request the administrator attention,It's not worthy to allow a cheat to hold such a rank.

Now he's back to work and going on submitting amaroq's solutions ... rank 26 at the moment ...

Yes, I noticed that. This donkey is submitting my solutions in rapid succession. I guess that is the consequence of my putting them on my website. I loath him and I pity him, but I see no reason to remove my solutions from my site. I've added a short motivation though and hope others will not follow his immoral example. But I'm probably too optimistic.

To be honest, I'm not really surprised.. if you don't want your solutions copied, don't make them publicly available. If you want to make them publicly available, you should expect a large number of people to copy them, that's just how it works.

No, it isn't a surprise at all. It's more surprising that it does not happen more often.

@amaroq: Yes, I think you are too optimistic ...

Or maybe too naive.
I like to believe in the goodness of people and, aside from one or two black sheep like that Macedonian, most programmers solve problems for the same reason I do, because they love to solve problems. Copy/pasting other's code takes the fun out of it.
Yes, it is too naive. I'll consider my options.

Yes there is no point for removing your solution,most of the classical problems solution are available in the web.A person good with search engine can easily find them.Your solution just increment the counter.

A person submitting others solution with just copy paste gets nothing but wasting his own time.

Out of interest, why do you put your code online? The only result I can think of is people copying your code; it's not like reading someone elses solutions tends to help inexperiences programmers learn anything (quite the opposite actually, at least from what I've seen; the true learning occurs in coming up with all the ways that don't work, and debugging). I haven't actually seen your site myself, so I'm probably missing something, but I was wondering..

Why? I don't know, really. Why do people create websites or write blogs?
The banal answer is that I wanted to create a website and I had nothing better to put on it. I had a vague idea to write something about programming, which is my passion, but for the lack of contents I started to solve SPOJ problems to find inspiration. It got a little out of hand: I spent lots of time solving problems and so I started to put the solutions on my site. Nothing else, really.
I don't know about the educational value of reading other peoples' code. You're probably right; you seem to be more experienced in that matter. Often the best you can learn from it is how NOT to program. But I never had an audience in mind when I put them on my site.
As I said: I'll consider my options. I will probably dump the whole site eventually anyway.

I know your site and if I remember right, there were not only the solutions, but a short hint (one or few words) on the basic idea to solve the problem. As I am really unexperienced in algorithms (I never had any lessons, didn't study that kind of thing, never participated in any contest), that simple hint (e.g. not more than "DP") helped me on the one or other problem to look into the right direction.

Perhaps that could be a way of connecting SPOJ and personal website: No solutions, only hints.

I know the link, but i like it since it has classification of problems which is a good thing, but not source code.

Maybe you can do this, keep the page (without source code) if anybody needs source code, he can email you.
I think that's good. I dont see any point for posting code especially when we have really helpful people in the forums.

Thanks.