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 (58 solutions by 16 contestants):
Round 1A (10 solutions by 3 contestants):
Round 1B (5 solutions by 3 contestants):
Round 1C (8 solutions by 4 contestants):
Round 2 (9 solutions by 3 contestants):
Round 3 (6 solutions by 2 contestants):
AMER Semifinal (3 solutions by 1 contestant):

Submission Origin

United States (9 contestants)
Japan (2 contestants)
Germany (2 contestants)
Mexico (1 contestant)
Hungary (1 contestant)
France (1 contestant)
Canada (1 contestant)