You have a place at SPOJ for that : http://www.spoj.com/BSCPROG/
All submitted codes are public : you know that when entering.
For your request, you should understand that if we could see fastest codes, then that would kill many problems...
I do have some fast code, I'm very happy not to be able to look at numerix's incredible fast codes : it gives me motivation to find some new ideas. I don't want my code (unreadable in any case) are made public. Maybe many other psolvers don't want to.
You will make more progress in searching how to do that rather in seeing it.
In French, there's a judge with different behavior : FranceIOI.
Once solved the problem, you have a PSetter solution available, with comments. You can learn a lot.
But you can't see how many psolvers solve the task, nor the time they got : the 'competition' is over. Next task.
It's rather how many submissions did you need to get AC.