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Problems solved

Qualification Round (186 solutions by 53 contestants):
Round 1A (17 solutions by 8 contestants):
Round 1B (41 solutions by 17 contestants):
Round 1C (22 solutions by 9 contestants):

Submission Origin

United States (11 contestants)
Japan (7 contestants)
Canada (4 contestants)
France (3 contestants)
Netherlands (3 contestants)
South Korea (3 contestants)
Brazil (2 contestants)
China (2 contestants)
India (2 contestants)
Slovakia (2 contestants)
Taiwan (2 contestants)
United Kingdom (2 contestants)
Antarctica (1 contestant)
Armenia (1 contestant)
Austria (1 contestant)
Czech Republic (1 contestant)
Dominican Republic (1 contestant)
Hong Kong (1 contestant)
Indonesia (1 contestant)
Israel (1 contestant)
Romania (1 contestant)
Russia (1 contestant)
South Africa (1 contestant)
Switzerland (1 contestant)