Any HN'ers doing the Facebook Hacker Cup?

Did anyone go through the qualifying round last weekend? Any comments or discussion on the event so far? Has anyone gained insight into how facebook expects output and source code to be submitted? (During the qualifying round, when you were ready to submit your answer, a pop-up window would appear for you to copy-and-paste into. I just copied and pasted my answer and didn't submit my source code. They seem to have let me through on that basis as far as the qualifying round, but I'm sure that won't be permitted during the subsequent rounds.)