Perhaps today and/or tomorrow due to a power outage there may be disruptions in the work of Codeforces and Polygon. Please do not plan any important events during this time. If there are details or the exact time, we will definitely publish them.
Index Page

The mission of Polygon is to provide platform for creation of programming contest problems. Polygon supports the whole development cycle:
  • problem statement writing
  • test data preparing (generators supported)
  • model solutions (including correct and wittingly incorrect)
  • judging
  • automatic validation
Registered users: 35218
Problems total: 176754
Invokers waiting: 59
27 Jun 2016 - Polygon API has been released. You can view documentation here.
7 Dec 2011 - Now you may download testlib and polygon documentation from Polygon installation.
17 Jul 2010 - Supported contests and PDF-statements.
3 Nov 2009 - Released new version. Tags and problem filters supported. Also many other smaller fixes done.
8 Mar 2009 - Use public issue tracker to post bug or feature request.
8 Mar 2009 - Beta version has been deployed.