Hmm..0 seems to be the right answer, but it could be a trick question. I'll go with 1, because the pig ate itself and not one of the pieces of bacon served to them.
that's an odd question to ask.... well, my guess is that there is one piece of bacon left, because if the first guy ate "one bacon" and the next two ate only a piece of bacon (which might be one half each) soooo..... there should only be one left.... or maybe Zinc's right, and i'm just plain stupid. >.<