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 (56 solutions by 18 contestants):
Round 1A (21 solutions by 7 contestants):
Round 1B (7 solutions by 3 contestants):
Round 1C (19 solutions by 6 contestants):
Round 2 (2 solutions by 2 contestants):

Submission Origin

United States (5 contestants)
Japan (3 contestants)
Spain (2 contestants)
Taiwan (2 contestants)
Greece (1 contestant)
Netherlands (1 contestant)
Singapore (1 contestant)
Switzerland (1 contestant)
United Kingdom (1 contestant)
Western Sahara (1 contestant)