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Problems solved

Qualification Round (2108 solutions by 595 contestants):
Round 1A (178 solutions by 123 contestants):
Round 1B (418 solutions by 172 contestants):
Round 1C (354 solutions by 152 contestants):
Round 2 (181 solutions by 68 contestants):
Round 3 (17 solutions by 8 contestants):

Submission Origin

United States (92 contestants)
India (85 contestants)
China (55 contestants)
Russia (34 contestants)
Ukraine (23 contestants)
Brazil (20 contestants)
Australia (18 contestants)
Japan (15 contestants)
Pakistan (15 contestants)
United Kingdom (15 contestants)
Hungary (14 contestants)
Colombia (13 contestants)
Thailand (13 contestants)
Argentina (12 contestants)
Canada (11 contestants)
Poland (11 contestants)
Czech Republic (10 contestants)
France (9 contestants)
Israel (9 contestants)
Belarus (7 contestants)
Romania (7 contestants)
South Korea (7 contestants)
Italy (6 contestants)
Kazakhstan (6 contestants)
Vietnam (6 contestants)
Denmark (5 contestants)
Mexico (5 contestants)
Peru (5 contestants)
Spain (5 contestants)
Egypt (4 contestants)
Netherlands (4 contestants)
Slovakia (4 contestants)
South Africa (4 contestants)
Belgium (3 contestants)
Germany (3 contestants)
Indonesia (3 contestants)
Moldova (3 contestants)
Portugal (3 contestants)
Sweden (3 contestants)
Switzerland (3 contestants)
Turkey (3 contestants)
Bangladesh (2 contestants)
Chile (2 contestants)
Croatia (2 contestants)
Ireland (2 contestants)
Lebanon (2 contestants)
Lithuania (2 contestants)
New Zealand (2 contestants)
Philippines (2 contestants)
Saudi Arabia (2 contestants)
Singapore (2 contestants)
Sri Lanka (2 contestants)
Uruguay (2 contestants)
Algeria (1 contestant)
Barbados (1 contestant)
Bulgaria (1 contestant)
Costa Rica (1 contestant)
Estonia (1 contestant)
Finland (1 contestant)
Georgia (1 contestant)
Ghana (1 contestant)
Greece (1 contestant)
Hong Kong (1 contestant)
Jordan (1 contestant)
Latvia (1 contestant)
Malaysia (1 contestant)
Morocco (1 contestant)
Palestinian Territory (1 contestant)
Puerto Rico (1 contestant)
Serbia (1 contestant)
Taiwan (1 contestant)
Tunisia (1 contestant)
Venezuela (1 contestant)