It seems to be a problem with the website. Pz has reuploaded it here as a temporary solution. You have to scroll down right to the bottom to see the results, and if you want to run it again you need to go to back to the top and click Fork.
Pz said he's gonna keep an eye on the website in case it starts working again, because as it is it won't save his code when he tries to reupload it.