Nearly all of the contests on topcoder.com are public, and anyone can register. In certain cases where we'll need to create an algorithm (Marathon Match), we'll host what we call an "invitational", where members of the community are invited to help test datasets before we launch marathon matches. If you participate in this invititational dataset testing, you are not allowed to participate in the Marathon Match because you will have advance access to data.
If you're interested in testing the dataset before the Marathon Match, please contact Rashid Sial (email@example.com).
Final Submission Guidelines
Private contest - guidelines will be provided directly to competitors.