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Problems solved

Qualification Round (1852 solutions by 740 contestants):
Round 1A (151 solutions by 69 contestants):
Round 1B (179 solutions by 75 contestants):
Round 1C (374 solutions by 151 contestants):
Round 2 (96 solutions by 51 contestants):
Round 3 (7 solutions by 4 contestants):

Submission Origin

India (238 contestants)
China (108 contestants)
Brazil (64 contestants)
United States (57 contestants)
Japan (26 contestants)
South Korea (18 contestants)
Taiwan (18 contestants)
Russia (16 contestants)
Australia (14 contestants)
Canada (14 contestants)
France (14 contestants)
Romania (14 contestants)
Turkey (14 contestants)
Poland (12 contestants)
Mexico (11 contestants)
Spain (11 contestants)
United Kingdom (10 contestants)
Hong Kong (9 contestants)
Portugal (9 contestants)
Czech Republic (7 contestants)
Greece (7 contestants)
Argentina (6 contestants)
Germany (6 contestants)
Israel (6 contestants)
Slovakia (6 contestants)
Venezuela (6 contestants)
Italy (4 contestants)
Thailand (4 contestants)
Indonesia (3 contestants)
Netherlands (3 contestants)
Ukraine (3 contestants)
Afghanistan (2 contestants)
Azerbaijan (2 contestants)
Bulgaria (2 contestants)
Croatia (2 contestants)
Cuba (2 contestants)
Hungary (2 contestants)
Latvia (2 contestants)
Peru (2 contestants)
South Africa (2 contestants)
Albania (1 contestant)
Andorra (1 contestant)
Austria (1 contestant)
Bosnia and Herzegovina (1 contestant)
Chile (1 contestant)
Colombia (1 contestant)
Denmark (1 contestant)
Egypt (1 contestant)
Georgia (1 contestant)
Guatemala (1 contestant)
Ireland (1 contestant)
Lithuania (1 contestant)
Malaysia (1 contestant)
Morocco (1 contestant)
New Zealand (1 contestant)
Norway (1 contestant)
Philippines (1 contestant)
Singapore (1 contestant)
St Vincent & Grenadines (1 contestant)
Sweden (1 contestant)
Switzerland (1 contestant)
Vietnam (1 contestant)