Language Details: Scheme

Scheme is a functional programming language and one of the two main dialects of the programming language Lisp, following a minimalist design philosophy specifying a small standard core with powerful tools for language extension.

Scheme article on Wikipedia
Code Jam 2010 Contestants using Scheme
Qualification Round
Used in 43 solutions by 17 contestants:
Round 1A
Used in 4 solutions by 3 contestants:
Round 1B
Used in 10 solutions by 4 contestants:
Round 1C
Used in 8 solutions by 3 contestants:

Submission Origin

Japan (4 contestants)
Romania (2 contestants)
Argentina (1 contestant)
Austria (1 contestant)
Brazil (1 contestant)
Canada (1 contestant)
China (1 contestant)
Czech Republic (1 contestant)
Mexico (1 contestant)
New Zealand (1 contestant)
Poland (1 contestant)
Russia (1 contestant)
United States (1 contestant)