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Problems solved

Qualification Round (25095 solutions by 7236 contestants):
Round 1A (5359 solutions by 1904 contestants):
Round 1B (5305 solutions by 1871 contestants):
Round 1C (4370 solutions by 1730 contestants):
Round 2 (4623 solutions by 1506 contestants):
Round 3 (781 solutions by 305 contestants):
Final (134 solutions by 21 contestants):

Submission Origin

China (1530 contestants)
India (1299 contestants)
United States (431 contestants)
Russia (426 contestants)
Japan (326 contestants)
Poland (216 contestants)
Taiwan (193 contestants)
Ukraine (187 contestants)
Brazil (184 contestants)
South Korea (183 contestants)
Bangladesh (155 contestants)
Egypt (148 contestants)
Indonesia (105 contestants)
Romania (96 contestants)
Thailand (96 contestants)
Canada (94 contestants)
France (93 contestants)
Vietnam (76 contestants)
Hong Kong (75 contestants)
Belarus (73 contestants)
Argentina (72 contestants)
Germany (71 contestants)
Australia (62 contestants)
Iran (62 contestants)
Spain (62 contestants)
Bulgaria (53 contestants)
Slovakia (53 contestants)
Mexico (49 contestants)
United Kingdom (49 contestants)
Peru (48 contestants)
Colombia (46 contestants)
Croatia (45 contestants)
... (43 contestants)
Greece (43 contestants)
Hungary (42 contestants)
Singapore (41 contestants)
Italy (39 contestants)
Pakistan (38 contestants)
Sweden (36 contestants)
Turkey (32 contestants)
Venezuela (30 contestants)
Georgia (26 contestants)
Czech Republic (22 contestants)
Bolivia (21 contestants)
Lithuania (21 contestants)
Portugal (19 contestants)
South Africa (19 contestants)
Belgium (18 contestants)
Switzerland (18 contestants)
Israel (17 contestants)
New Zealand (17 contestants)
Netherlands (16 contestants)
Latvia (14 contestants)
Norway (14 contestants)
Mongolia (13 contestants)
Serbia (13 contestants)
Sri Lanka (13 contestants)
Lebanon (12 contestants)
Kazakhstan (11 contestants)
Slovenia (11 contestants)
Austria (9 contestants)
Azerbaijan (9 contestants)
Dominican Republic (9 contestants)
Finland (9 contestants)
Morocco (9 contestants)
Armenia (8 contestants)
Bosnia and Herzegovina (7 contestants)
Denmark (7 contestants)
Estonia (7 contestants)
Moldova (7 contestants)
Malaysia (6 contestants)
Chile (5 contestants)
Ireland (5 contestants)
Nepal (5 contestants)
Nigeria (5 contestants)
Uzbekistan (5 contestants)
Algeria (4 contestants)
Cuba (4 contestants)
Ghana (4 contestants)
Kyrgyzstan (4 contestants)
Philippines (4 contestants)
Cyprus (3 contestants)
Ethiopia (3 contestants)
Iceland (3 contestants)
Jordan (3 contestants)
Luxembourg (3 contestants)
Macedonia (3 contestants)
Kenya (2 contestants)
Malawi (2 contestants)
Montenegro (2 contestants)
Palestinian Territory (2 contestants)
Senegal (2 contestants)
Syria (2 contestants)
Trinidad and Tobago (2 contestants)
Tunisia (2 contestants)
United Arab Emirates (2 contestants)
Uruguay (2 contestants)
Afghanistan (1 contestant)
Albania (1 contestant)
Andorra (1 contestant)
Antigua and Barbuda (1 contestant)
Benin (1 contestant)
Cambodia (1 contestant)
Cameroon (1 contestant)
Cape Verde (1 contestant)
Costa Rica (1 contestant)
Ecuador (1 contestant)
Jamaica (1 contestant)
Macau (1 contestant)
Malta (1 contestant)
Paraguay (1 contestant)
Puerto Rico (1 contestant)
Rwanda (1 contestant)
South Sudan (1 contestant)
Turkmenistan (1 contestant)
U.S. Virgin Islands (1 contestant)
Yemen (1 contestant)
Zimbabwe (1 contestant)