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Problems solved

Qualification Round (42970 solutions by 11504 contestants):
Round 1A (5842 solutions by 2134 contestants):
Round 1B (8755 solutions by 3677 contestants):
Round 1C (5408 solutions by 2296 contestants):
Round 2 (7856 solutions by 1867 contestants):
Round 3 (1298 solutions by 319 contestants):
World Finals (143 solutions by 21 contestants):

Submission Origin

India (2908 contestants)
China (2162 contestants)
United States (656 contestants)
Russia (573 contestants)
Japan (362 contestants)
Taiwan (321 contestants)
South Korea (286 contestants)
Poland (277 contestants)
Bangladesh (270 contestants)
Egypt (268 contestants)
Brazil (264 contestants)
Ukraine (210 contestants)
Canada (168 contestants)
Romania (164 contestants)
Indonesia (161 contestants)
Pakistan (147 contestants)
Vietnam (124 contestants)
France (112 contestants)
Thailand (108 contestants)
Australia (101 contestants)
Hong Kong (98 contestants)
Mexico (95 contestants)
Belarus (92 contestants)
Iran (91 contestants)
Germany (89 contestants)
Argentina (81 contestants)
Peru (77 contestants)
Spain (71 contestants)
Slovakia (69 contestants)
Colombia (66 contestants)
Singapore (66 contestants)
Bulgaria (63 contestants)
Italy (57 contestants)
United Kingdom (55 contestants)
Bolivia (52 contestants)
Turkey (50 contestants)
Hungary (49 contestants)
Czech Republic (43 contestants)
Croatia (40 contestants)
Greece (40 contestants)
Venezuela (40 contestants)
Georgia (35 contestants)
Sweden (33 contestants)
Kazakhstan (30 contestants)
Armenia (27 contestants)
Belgium (27 contestants)
Palestinian Territory (27 contestants)
Netherlands (26 contestants)
South Africa (26 contestants)
Israel (25 contestants)
New Zealand (25 contestants)
Switzerland (25 contestants)
Morocco (24 contestants)
Portugal (24 contestants)
Lithuania (23 contestants)
Serbia (23 contestants)
Malaysia (22 contestants)
Latvia (21 contestants)
Jordan (20 contestants)
Philippines (20 contestants)
Finland (19 contestants)
Lebanon (19 contestants)
Austria (17 contestants)
Dominican Republic (16 contestants)
Sri Lanka (16 contestants)
Mongolia (12 contestants)
Turkmenistan (11 contestants)
Azerbaijan (10 contestants)
Chile (10 contestants)
Nepal (10 contestants)
Tunisia (10 contestants)
Denmark (9 contestants)
Ireland (9 contestants)
Norway (9 contestants)
Slovenia (9 contestants)
Kyrgyzstan (8 contestants)
Nigeria (8 contestants)
Zimbabwe (8 contestants)
Moldova (7 contestants)
Iceland (6 contestants)
Macedonia (6 contestants)
Afghanistan (5 contestants)
Andorra (5 contestants)
Bosnia and Herzegovina (5 contestants)
Albania (4 contestants)
Cameroon (4 contestants)
Estonia (4 contestants)
Syria (4 contestants)
Algeria (3 contestants)
Cuba (3 contestants)
Ghana (3 contestants)
Jamaica (3 contestants)
Luxembourg (3 contestants)
Macau (3 contestants)
North Korea (3 contestants)
Uruguay (3 contestants)
Benin (2 contestants)
Burundi (2 contestants)
Ethiopia (2 contestants)
Gabon (2 contestants)
Guatemala (2 contestants)
Puerto Rico (2 contestants)
Uzbekistan (2 contestants)
Vatican City (2 contestants)
Zambia (2 contestants)
Angola (1 contestant)
Antigua and Barbuda (1 contestant)
Cambodia (1 contestant)
Costa Rica (1 contestant)
Cyprus (1 contestant)
Ecuador (1 contestant)
Guyana (1 contestant)
Ivory Coast (1 contestant)
Madagascar (1 contestant)
Malta (1 contestant)
Namibia (1 contestant)
Panama (1 contestant)
Papua New Guinea (1 contestant)
Saint Vincent (1 contestant)
Saudi Arabia (1 contestant)
Seychelles (1 contestant)
Sierra Leone (1 contestant)
Trinidad and Tobago (1 contestant)
U.S. Virgin Islands (1 contestant)