Broken Problems in Problem Set IX

[Zwergesel]

A number of problems in problem set IX have had their problem text and leader board disappear.
Resubmitting previously accepted solutions yields a "Wrong Answer".
Among the affected problems are: 930, 932, 933, 934, 936, 937
Those are the ones that I had previously solved, which are now marked as wrong.
There are a couple more in the problem set that seem to be affected, since they have 0% solved, but some of them still have their problem statement, so they might just not have been solved ever (unlikely?).

[brianfry713]

See: http://uva.onlinejudge.org/index.php?op ... ategory=11
The problems with a red check have no judge's I/O and are now "impossible" to get AC. Before a few months ago a blank program could get AC on them.
If you want to create a dataset for any red check problem email it to revilla@mac.uva.es
The main problem statements may have been removed but you can still see them by going to the external problem statement or pdf, example:
http://uva.onlinejudge.org/external/9/971.html

There are some problems with possibly valid data that no one has solved yet, 901 and 12591 are some examples.

[Zwergesel]

Okay, thank you!
But at some point data sets for these problems existed. What happened to them?
Also, are there any guidelines for submitting new data sets? Do I just send an input file and corresponding output file?

And since we're on the topic of check marks: What is the meaning of the yellow check marks that some problems have?

[brianfry713]

No, I don't think these problems had data sets. Before a few months ago you could submit a C code like this and it would get AC:

Code: Select all

int main() {return 0;}

That was changed so that these codes (or possibly programs that were actually trying to solve the problem) no longer get AC.

Yes email Miguel (the site admin) an input file, output file, and your code.

The yellow check mark means that there is a special judge for that problem and multiple correct outputs may be accepted.

[Zwergesel]

Okay, I will see if I can create some data sets for these problems.
I'm pretty sure that they had valid test cases though, since I originally solved them mid-2011 and they didn't have 100% correct submissions back then, so they didn't just accept all solutions.

[brianfry713]

The judge may have rejected solutions that printed anything.

[Carlos]

If you want to contribute with the dataset for any problem with a red tick, please contact us via the "Contact us" form in the web.