East Central North America Region

The 2011 ACM-ICPC East Central North America
Regional Programming Contest

Final Report

The 2011 ACM-ICPC East Central North America Regional Programming Contest (ACM-ICPC ECNA RPC) was held on Saturday October 22, 2011. We had 122 teams drawn from 60 colleges and universities throughout western Pennsylvania, Ohio, Michigan, eastern Ontario, and Indiana (excluding the Greater Chicago Metropolitan Area). There was an additional 4 teams who had registered but did not participate and were canceled.

As it was difficult for some teams in the ECNA region to travel to a single site for the contest, the ECNA RPC was held as a distributed contest. There were four contest sites: Cincinnati Site in Cincinnati, Ohio, USA (33 teams from 16 schools); Grand Valley Site in Allendale, Michigan, USA (18 teams from 8 schools); Windsor Site in Windsor, Ontario, Canada (25 teams from 13 schools); and Youngstown Site in Youngstown, Ohio, USA (46 teams from 23 schools).

We are pleased to report that the ECNA RPC was successful this year. Here are a few comments and observations:

1. The contest started at 10:00:03 EST and ended at 15:00:03 EST.

2. Version 9.1.6 of the PC^2 Contest Control System was used to run the Contest. The following technical problems were reported:

   • Multiple teams at Cincinnati Site had there PC^2 client disconnect from the server and not be able to submit test problems without restarting the client. A report will be filed with PC^2 maintainers.
   • There was an incompatibility of compilers at the sites. Both Cincinnati Site and Grand Valley Site were running gcc 4, while Youngstown Site (the Judges' Site) and Windsor Site remained with gcc 3. This incompatibility was handled right after the first C++ submission for Problem D was received. The Judges sent a general clarification stating "We request that any C++ program that uses sqrt() should explicity cast the argument to sqrt as a double. If you forget, don't worry - we're handling it. This just makes the judges' task easier if you perform the cast yourself." After that, the Judges decided to have one judge handle all C++ submissions for problem D, and insert the cast himself if necessary.

3. The contest consisted of 9 problems with 94 teams solving at least one problem.

4. The maximum number of problems solved was 9 problems.

5. You may view or download the Problem Sets and Judges' Solutions.

6. You may view the Final Standings.

7. Congratulations to the top 15 teams of The 2011 ECNA RPC

8. Congratulations to the top 10 teams at each site

9. Congratulations to the winners of special awards