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Problems solved

Qualification Round (19465 solutions by 5117 contestants):
Round 1A (1740 solutions by 736 contestants):
Round 1B (3336 solutions by 1340 contestants):
Round 1C (1171 solutions by 449 contestants):
Round 2 (513 solutions by 183 contestants):

Submission Origin

India (1507 contestants)
United States (1016 contestants)
China (183 contestants)
Canada (141 contestants)
Russia (123 contestants)
South Korea (104 contestants)
Colombia (102 contestants)
France (101 contestants)
Germany (101 contestants)
Egypt (100 contestants)
Ukraine (86 contestants)
Japan (73 contestants)
Australia (66 contestants)
United Kingdom (64 contestants)
Brazil (56 contestants)
Vietnam (56 contestants)
Spain (54 contestants)
Poland (50 contestants)
Taiwan (47 contestants)
Italy (45 contestants)
Pakistan (43 contestants)
Mexico (40 contestants)
Turkey (40 contestants)
Singapore (38 contestants)
Hong Kong (36 contestants)
Romania (35 contestants)
Netherlands (34 contestants)
Israel (33 contestants)
South Africa (32 contestants)
Sweden (31 contestants)
Hungary (30 contestants)
Belgium (28 contestants)
Thailand (25 contestants)
Belarus (24 contestants)
Iran (24 contestants)
Sri Lanka (24 contestants)
Indonesia (23 contestants)
Philippines (23 contestants)
Bangladesh (22 contestants)
Morocco (22 contestants)
New Zealand (20 contestants)
Tunisia (20 contestants)
Argentina (19 contestants)
Greece (19 contestants)
Portugal (19 contestants)
Kazakhstan (18 contestants)
Czech Republic (17 contestants)
Nigeria (16 contestants)
Slovakia (16 contestants)
Cameroon (15 contestants)
Switzerland (15 contestants)
? (13 contestants)
Austria (13 contestants)
Saudi Arabia (12 contestants)
Latvia (10 contestants)
Palestine (10 contestants)
Azerbaijan (9 contestants)
Bulgaria (9 contestants)
Chile (9 contestants)
Ireland (9 contestants)
Nepal (9 contestants)
Norway (9 contestants)
Algeria (8 contestants)
Moldova (8 contestants)
Slovenia (8 contestants)
Bolivia (7 contestants)
Cambodia (7 contestants)
Croatia (7 contestants)
Macedonia (7 contestants)
Denmark (6 contestants)
Ecuador (6 contestants)
Georgia (6 contestants)
Jordan (6 contestants)
Uruguay (6 contestants)
Venezuela (6 contestants)
Estonia (5 contestants)
Kenya (5 contestants)
Peru (5 contestants)
Ethiopia (4 contestants)
Kosovo (4 contestants)
Lebanon (4 contestants)
Lithuania (4 contestants)
Malaysia (4 contestants)
Uzbekistan (4 contestants)
Benin (3 contestants)
Cyprus (3 contestants)
Dominican Republic (3 contestants)
Finland (3 contestants)
Haiti (3 contestants)
Togo (3 contestants)
Zimbabwe (3 contestants)
Albania (2 contestants)
Antarctica (2 contestants)
Guatemala (2 contestants)
Iceland (2 contestants)
Iraq (2 contestants)
Mongolia (2 contestants)
Senegal (2 contestants)
Serbia (2 contestants)
United Arab Emirates (2 contestants)
Afghanistan (1 contestant)
Angola (1 contestant)
Bahamas (1 contestant)
Bahrain (1 contestant)
Bosnia and Herzegovina (1 contestant)
Botswana (1 contestant)
Burkina Faso (1 contestant)
Costa Rica (1 contestant)
Cuba (1 contestant)
Ghana (1 contestant)
Guadeloupe (1 contestant)
Jamaica (1 contestant)
Kuwait (1 contestant)
Macau (1 contestant)
Malta (1 contestant)
Mauritius (1 contestant)
Mozambique (1 contestant)
Myanmar (1 contestant)
Namibia (1 contestant)
Oman (1 contestant)
Rwanda (1 contestant)
Réunion (1 contestant)
Svalbard and Jan Mayen (1 contestant)
Syria (1 contestant)
Tajikistan (1 contestant)
Turkmenistan (1 contestant)
Uganda (1 contestant)
Åland Islands (1 contestant)