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Problems solved

Qualification Round (3896 solutions by 1110 contestants):
Round 1A (213 solutions by 115 contestants):
Round 1B (614 solutions by 313 contestants):
Round 1C (331 solutions by 166 contestants):
Round 2 (143 solutions by 38 contestants):
Round 3 (12 solutions by 3 contestants):

Submission Origin

United States (145 contestants)
India (141 contestants)
Russia (55 contestants)
Poland (42 contestants)
Pakistan (39 contestants)
Canada (38 contestants)
United Kingdom (37 contestants)
Japan (35 contestants)
China (30 contestants)
Brazil (28 contestants)
Israel (28 contestants)
Ukraine (28 contestants)
Australia (25 contestants)
Hungary (23 contestants)
Egypt (22 contestants)
Germany (22 contestants)
Iran (20 contestants)
Mexico (20 contestants)
France (19 contestants)
Italy (18 contestants)
South Korea (18 contestants)
Netherlands (17 contestants)
Spain (17 contestants)
South Africa (15 contestants)
Thailand (15 contestants)
Belarus (13 contestants)
Argentina (12 contestants)
New Zealand (12 contestants)
Romania (12 contestants)
Turkey (12 contestants)
Greece (8 contestants)
Indonesia (8 contestants)
Croatia (7 contestants)
Austria (6 contestants)
Belgium (6 contestants)
Bulgaria (6 contestants)
Philippines (6 contestants)
Sweden (6 contestants)
Taiwan (6 contestants)
Vietnam (6 contestants)
Czech Republic (5 contestants)
Denmark (5 contestants)
Hong Kong (5 contestants)
Latvia (5 contestants)
Sri Lanka (5 contestants)
Colombia (4 contestants)
Finland (4 contestants)
Lithuania (4 contestants)
Portugal (4 contestants)
Singapore (4 contestants)
Slovakia (4 contestants)
Algeria (3 contestants)
Azerbaijan (3 contestants)
Bolivia (3 contestants)
Chile (3 contestants)
Jordan (3 contestants)
Kazakhstan (3 contestants)
Peru (3 contestants)
Switzerland (3 contestants)
Uzbekistan (3 contestants)
Venezuela (3 contestants)
Bangladesh (2 contestants)
Estonia (2 contestants)
Georgia (2 contestants)
Guernsey (2 contestants)
Kyrgyzstan (2 contestants)
Macedonia (2 contestants)
Malaysia (2 contestants)
Norway (2 contestants)
Togo (2 contestants)
Yemen (2 contestants)
Brunei (1 contestant)
Dominican Republic (1 contestant)
Ghana (1 contestant)
Iceland (1 contestant)
Ireland (1 contestant)
Macau (1 contestant)
Mauritius (1 contestant)
Nigeria (1 contestant)
Saudi Arabia (1 contestant)
Serbia (1 contestant)
Syria (1 contestant)
Tunisia (1 contestant)
Uruguay (1 contestant)
Vatican City (1 contestant)