I do not get the context of two hours here. AFAIK, ACM Programming contest consist of ~5 hours.<p>FWIW, I am also participating this year. My team was ranked #11 in prelims and we are competing for qualifying world finals at IITK, India. ( <a href="http://www.cse.iitk.ac.in/users/acm/" rel="nofollow">http://www.cse.iitk.ac.in/users/acm/</a> )