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Problems solved

Qualification Round (609 solutions by 195 contestants):
Round 1A (141 solutions by 62 contestants):
Round 1B (32 solutions by 31 contestants):
Round 1C (81 solutions by 43 contestants):
Round 2 (26 solutions by 15 contestants):

Submission Origin

United States (60 contestants)
India (22 contestants)
Brazil (11 contestants)
Russia (11 contestants)
China (10 contestants)
Japan (9 contestants)
Canada (7 contestants)
Israel (7 contestants)
United Kingdom (6 contestants)
Germany (5 contestants)
Poland (5 contestants)
Ukraine (4 contestants)
Australia (3 contestants)
Italy (3 contestants)
Mexico (3 contestants)
Netherlands (3 contestants)
Portugal (3 contestants)
Taiwan (3 contestants)
Argentina (2 contestants)
Czech Republic (2 contestants)
Hungary (2 contestants)
South Korea (2 contestants)
Sweden (2 contestants)
Thailand (2 contestants)
Afghanistan (1 contestant)
Austria (1 contestant)
Belarus (1 contestant)
Bulgaria (1 contestant)
Chile (1 contestant)
Colombia (1 contestant)
Dominican Republic (1 contestant)
Greece (1 contestant)
Hong Kong (1 contestant)
Malaysia (1 contestant)
New Zealand (1 contestant)
Romania (1 contestant)
Singapore (1 contestant)
Spain (1 contestant)
Switzerland (1 contestant)