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Problems solved

Qualification Round (625 solutions by 215 contestants):
Round 1A (41 solutions by 37 contestants):
Round 1B (88 solutions by 43 contestants):
Round 1C (75 solutions by 38 contestants):
Round 2 (19 solutions by 8 contestants):

Submission Origin

United States (58 contestants)
India (27 contestants)
Japan (18 contestants)
Russia (16 contestants)
Brazil (11 contestants)
China (10 contestants)
Taiwan (8 contestants)
United Kingdom (7 contestants)
Australia (5 contestants)
Canada (5 contestants)
Israel (5 contestants)
Spain (5 contestants)
France (4 contestants)
Netherlands (4 contestants)
Poland (4 contestants)
Germany (3 contestants)
Venezuela (3 contestants)
Argentina (2 contestants)
Czech Republic (2 contestants)
Hungary (2 contestants)
Mexico (2 contestants)
New Zealand (2 contestants)
Portugal (2 contestants)
South Africa (2 contestants)
Turkey (2 contestants)
Ukraine (2 contestants)
Albania (1 contestant)
Chile (1 contestant)
Colombia (1 contestant)
Croatia (1 contestant)
Denmark (1 contestant)
Dominican Republic (1 contestant)
Finland (1 contestant)
Greece (1 contestant)
Hong Kong (1 contestant)
Peru (1 contestant)
Romania (1 contestant)
South Korea (1 contestant)
Switzerland (1 contestant)