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Problems solved

Qualification Round (473 solutions by 168 contestants):
Round 1A (24 solutions by 21 contestants):
Round 1B (50 solutions by 24 contestants):
Round 1C (70 solutions by 38 contestants):
Round 2 (10 solutions by 4 contestants):

Submission Origin

United States (25 contestants)
India (17 contestants)
Russia (12 contestants)
Brazil (11 contestants)
France (9 contestants)
Poland (6 contestants)
Argentina (5 contestants)
Czech Republic (5 contestants)
Hungary (5 contestants)
Taiwan (5 contestants)
Netherlands (4 contestants)
Slovakia (4 contestants)
Australia (3 contestants)
Canada (3 contestants)
China (3 contestants)
Greece (3 contestants)
Indonesia (3 contestants)
Italy (3 contestants)
Malaysia (3 contestants)
Ukraine (3 contestants)
Vietnam (3 contestants)
Belarus (2 contestants)
Chile (2 contestants)
Egypt (2 contestants)
Germany (2 contestants)
Japan (2 contestants)
Jordan (2 contestants)
Lithuania (2 contestants)
Mexico (2 contestants)
Portugal (2 contestants)
Romania (2 contestants)
Switzerland (2 contestants)
Thailand (2 contestants)
United Kingdom (2 contestants)
Azerbaijan (1 contestant)
Belgium (1 contestant)
Bulgaria (1 contestant)
Colombia (1 contestant)
Estonia (1 contestant)
Finland (1 contestant)
Georgia (1 contestant)
Hong Kong (1 contestant)
Latvia (1 contestant)
Lebanon (1 contestant)
Madagascar (1 contestant)
Philippines (1 contestant)
South Africa (1 contestant)
Spain (1 contestant)
Turkey (1 contestant)
United Arab Emirates (1 contestant)
Venezuela (1 contestant)