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Problems solved

Qualification Round (6783 solutions by 1935 contestants):
Round 1A (610 solutions by 403 contestants):
Round 1B (1256 solutions by 530 contestants):
Round 1C (1077 solutions by 490 contestants):
Round 2 (754 solutions by 272 contestants):
Round 3 (91 solutions by 36 contestants):
World Final (37 solutions by 10 contestants):

Submission Origin

United States (389 contestants)
India (339 contestants)
China (138 contestants)
Russia (127 contestants)
Brazil (74 contestants)
Japan (66 contestants)
Germany (42 contestants)
Canada (41 contestants)
Colombia (40 contestants)
Egypt (40 contestants)
Ukraine (33 contestants)
United Kingdom (31 contestants)
Mexico (29 contestants)
Poland (28 contestants)
Australia (27 contestants)
Indonesia (27 contestants)
South Korea (27 contestants)
Hungary (26 contestants)
Argentina (24 contestants)
France (22 contestants)
Thailand (22 contestants)
Romania (21 contestants)
Vietnam (21 contestants)
Spain (19 contestants)
Italy (17 contestants)
New Zealand (16 contestants)
Pakistan (16 contestants)
Singapore (16 contestants)
Switzerland (16 contestants)
Hong Kong (15 contestants)
Macedonia (15 contestants)
Netherlands (15 contestants)
Taiwan (13 contestants)
Belarus (12 contestants)
Belgium (12 contestants)
Israel (12 contestants)
Venezuela (12 contestants)
Philippines (11 contestants)
Portugal (10 contestants)
South Africa (9 contestants)
Sri Lanka (9 contestants)
Czech Republic (8 contestants)
Kazakhstan (8 contestants)
Bulgaria (7 contestants)
Estonia (7 contestants)
Peru (7 contestants)
Slovakia (7 contestants)
Lebanon (6 contestants)
Serbia (6 contestants)
Georgia (5 contestants)
Guatemala (5 contestants)
Bangladesh (4 contestants)
Chile (4 contestants)
Denmark (4 contestants)
Morocco (4 contestants)
Nigeria (4 contestants)
Palestinian Territory (4 contestants)
Sweden (4 contestants)
Turkey (4 contestants)
Uruguay (4 contestants)
Austria (3 contestants)
Lithuania (3 contestants)
Malaysia (3 contestants)
Norway (3 contestants)
Dominican Republic (2 contestants)
Finland (2 contestants)
Kenya (2 contestants)
Moldova (2 contestants)
Oman (2 contestants)
Slovenia (2 contestants)
Albania (1 contestant)
Armenia (1 contestant)
Bolivia (1 contestant)
Bosnia and Herzegovina (1 contestant)
Costa Rica (1 contestant)
Croatia (1 contestant)
Ecuador (1 contestant)
Greece (1 contestant)
Jordan (1 contestant)
Nicaragua (1 contestant)
Rwanda (1 contestant)
Saudi Arabia (1 contestant)
Uganda (1 contestant)
United Arab Emirates (1 contestant)