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Problems solved

Qualification Round (1843 solutions by 648 contestants):
Round 1A (187 solutions by 91 contestants):
Round 1B (644 solutions by 219 contestants):
Round 1C (452 solutions by 168 contestants):
Round 2 (145 solutions by 66 contestants):
Round 3 (12 solutions by 7 contestants):

Submission Origin

India (103 contestants)
United States (68 contestants)
China (62 contestants)
Russia (36 contestants)
Ukraine (27 contestants)
Brazil (25 contestants)
Japan (22 contestants)
Canada (19 contestants)
Poland (19 contestants)
Israel (16 contestants)
Pakistan (15 contestants)
Hungary (14 contestants)
United Kingdom (14 contestants)
Argentina (12 contestants)
Australia (12 contestants)
Belarus (12 contestants)
Egypt (12 contestants)
Thailand (11 contestants)
Spain (10 contestants)
Romania (9 contestants)
South Africa (9 contestants)
Croatia (8 contestants)
France (7 contestants)
Italy (7 contestants)
South Korea (7 contestants)
Turkey (7 contestants)
Czech Republic (6 contestants)
Mexico (6 contestants)
Sweden (6 contestants)
Taiwan (6 contestants)
Belgium (5 contestants)
Colombia (5 contestants)
Peru (5 contestants)
Portugal (5 contestants)
Germany (4 contestants)
Netherlands (4 contestants)
Sri Lanka (4 contestants)
Vietnam (4 contestants)
Denmark (3 contestants)
Hong Kong (3 contestants)
Philippines (3 contestants)
Serbia (3 contestants)
Slovakia (3 contestants)
Austria (2 contestants)
Bulgaria (2 contestants)
Estonia (2 contestants)
Indonesia (2 contestants)
Iran (2 contestants)
Kazakhstan (2 contestants)
Latvia (2 contestants)
Lithuania (2 contestants)
Moldova (2 contestants)
Nigeria (2 contestants)
Switzerland (2 contestants)
Togo (2 contestants)
Algeria (1 contestant)
Aruba (1 contestant)
Bangladesh (1 contestant)
Congo (1 contestant)
Eritrea (1 contestant)
Ethiopia (1 contestant)
Greece (1 contestant)
Guatemala (1 contestant)
Kyrgyzstan (1 contestant)
Lebanon (1 contestant)
Madagascar (1 contestant)
Malaysia (1 contestant)
Mongolia (1 contestant)
Morocco (1 contestant)
New Zealand (1 contestant)
Singapore (1 contestant)
Venezuela (1 contestant)