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Problems solved

Qualification Round (3093 solutions by 987 contestants):
Round 1A (417 solutions by 174 contestants):
Round 1B (263 solutions by 133 contestants):
Round 1C (316 solutions by 150 contestants):
Round 2 (135 solutions by 54 contestants):
Round 3 (13 solutions by 7 contestants):
Final (5 solutions by 1 contestant):

Submission Origin

United States (140 contestants)
India (138 contestants)
China (36 contestants)
Japan (35 contestants)
Australia (33 contestants)
Russia (33 contestants)
United Kingdom (33 contestants)
Poland (29 contestants)
Brazil (27 contestants)
Egypt (27 contestants)
Ukraine (26 contestants)
Canada (23 contestants)
Israel (22 contestants)
Germany (19 contestants)
Netherlands (19 contestants)
Pakistan (19 contestants)
Spain (16 contestants)
Argentina (14 contestants)
Thailand (14 contestants)
France (13 contestants)
Hungary (13 contestants)
Mexico (13 contestants)
Romania (13 contestants)
Austria (10 contestants)
Czech Republic (10 contestants)
New Zealand (10 contestants)
Belarus (9 contestants)
Hong Kong (9 contestants)
Indonesia (9 contestants)
Slovakia (9 contestants)
South Africa (9 contestants)
South Korea (9 contestants)
... (8 contestants)
Vietnam (8 contestants)
Denmark (7 contestants)
Malaysia (7 contestants)
Turkey (7 contestants)
Belgium (6 contestants)
Bulgaria (6 contestants)
Colombia (6 contestants)
Croatia (6 contestants)
Finland (5 contestants)
Iran (5 contestants)
Italy (5 contestants)
Nigeria (5 contestants)
Norway (5 contestants)
Sweden (5 contestants)
Bangladesh (4 contestants)
Chile (4 contestants)
Peru (4 contestants)
Serbia (4 contestants)
Taiwan (4 contestants)
Greece (3 contestants)
Lithuania (3 contestants)
Nicaragua (3 contestants)
Palestinian Territory (3 contestants)
Portugal (3 contestants)
Togo (3 contestants)
Bolivia (2 contestants)
Bosnia and Herzegovina (2 contestants)
Dominican Republic (2 contestants)
Jamaica (2 contestants)
Kazakhstan (2 contestants)
Latvia (2 contestants)
Macedonia (2 contestants)
Venezuela (2 contestants)
Algeria (1 contestant)
Azerbaijan (1 contestant)
Ecuador (1 contestant)
Eritrea (1 contestant)
Fiji (1 contestant)
Ireland (1 contestant)
Jordan (1 contestant)
Kosovo (1 contestant)
Kyrgyzstan (1 contestant)
Moldova (1 contestant)
Morocco (1 contestant)
Nepal (1 contestant)
Panama (1 contestant)
Philippines (1 contestant)
Puerto Rico (1 contestant)
Saudi Arabia (1 contestant)
Singapore (1 contestant)
Slovenia (1 contestant)
Sri Lanka (1 contestant)
Switzerland (1 contestant)
Syria (1 contestant)
Uruguay (1 contestant)
Uzbekistan (1 contestant)