I'm just waiting for a rejudge; see http://www.spoj.com/tutorials/PS/#edit toward the bottom of that section; you may search the page for "Rejudge".

As to setting contests, please see http://www.spoj.com/tutorials/CS/ . If you have specific questions that aren't answered in that tutorial, I might be able to help.

Note that these tutorials are available from the side menu, underneath "my account".

Rejudge means to evaluate previous submissions again, so if you do a rejudge then my NZEC will turn into AC, and similarly for other users.

Is this problem intended for your peers at university? If so, you might want to consider adding a new private contest for that purpose. For publishing in the main problem set, you should consider the interests of a wider audience, and restricting the languages for what I see as an arbitrary reason only has the effect of alienating a large portion of that audience.

Edit: Oh I see now you've enabled all languages; cool. (Sometimes when you update such things, the effect isn't immediately visible for a little while, because of server cache and whatnot.)

The test data seems ok, thanks for fixing that. :) Before I unhide, please:

1) Allow all languages, or give a justification for the language restriction.
2) Rejudge all submissions, making sure to check the box "Refresh cached info about test sequence".

@Mitch Schwartz you're right! thank you very much.I will check carefully before upload.

now there are twelve people do this exercise, so you check your answers please !