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Problems solved

Qualification Round (439 solutions by 133 contestants):
Round 1A (60 solutions by 33 contestants):
Round 1B (35 solutions by 20 contestants):
Round 1C (37 solutions by 25 contestants):
Round 2 (5 solutions by 4 contestants):

Submission Origin

United States (36 contestants)
Japan (16 contestants)
India (14 contestants)
China (7 contestants)
Taiwan (6 contestants)
France (5 contestants)
Australia (4 contestants)
Brazil (4 contestants)
Israel (4 contestants)
Poland (4 contestants)
Russia (4 contestants)
United Kingdom (4 contestants)
Canada (3 contestants)
Indonesia (3 contestants)
Netherlands (3 contestants)
Germany (2 contestants)
Mexico (2 contestants)
South Korea (2 contestants)
Spain (2 contestants)
Aruba (1 contestant)
Colombia (1 contestant)
Cyprus (1 contestant)
Dominican Republic (1 contestant)
Greece (1 contestant)
Hong Kong (1 contestant)
Hungary (1 contestant)
Latvia (1 contestant)
Portugal (1 contestant)
Singapore (1 contestant)
Switzerland (1 contestant)
Ukraine (1 contestant)
Vietnam (1 contestant)