Language Details: Lisp

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Lisp is a family of computer programming languages with a long history and a distinctive, fully parenthesized Polish prefix notation.

Lisp article on Wikipedia

Problems solved

Qualification Round (67 solutions by 22 contestants):
Round 1B (10 solutions by 5 contestants):
Round 1C (12 solutions by 6 contestants):

Submission Origin

United States (4 contestants)
Japan (3 contestants)
Germany (2 contestants)
Spain (2 contestants)
Switzerland (2 contestants)
Argentina (1 contestant)
Brazil (1 contestant)
China (1 contestant)
Czech Republic (1 contestant)
France (1 contestant)
New Zealand (1 contestant)
Norway (1 contestant)
Philippines (1 contestant)
Poland (1 contestant)
Western Sahara (1 contestant)