Accorning to TopCoder the Swedish developers have a significant lead on their competitions. This is the organixation that sponsors the Google Code Jam
Read the Google Code Jam page which much better explains how these competitions work. It's only for the Java, C++, C# or VB.NET languages and I'm no expert with any of them so I won't be participating any time soon.
Sweden has here only 17 rated developers whereas USA has 1275, an maybe then the Swedish excellence isn't typical for the country but as a Swede I'm very proud of my fellow geeks.