This behaviour was common in the last Facebook Hacker Cup too. Most of the announcements of rounds starting included discussion of (and in some cases links to) solutions.
I guess it's part and parcel - I think Facebook did take action against obvious plagiarisers. If not, the later rounds will weed out the cheaters in any case.
I guess it's part and parcel - I think Facebook did take action against obvious plagiarisers. If not, the later rounds will weed out the cheaters in any case.