Russian, Japanese and Chinese Take Top Spots in ACM Programming Contest

here is the "exact" ranking, without grouping several participants into a single one position http://icpc.baylor.edu/scoreboard/

In what units is the time or what does it represent? I though they had only 5 hours available.

There is a penalty when your submission fails, for 20 minutes(?). The final time for a successful submission may add up over 5 hours.

They solved this in 5 hours, using one computer, one calculator and no other help.

Does anyone know what was the team size limit?