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Problems solved

Qualification Round (1016 solutions by 398 contestants):
Round 1A (45 solutions by 29 contestants):
Round 1B (40 solutions by 23 contestants):
Round 1C (28 solutions by 18 contestants):
Round 2 (4 solutions by 2 contestants):

Submission Origin

United States (55 contestants)
India (45 contestants)
Brazil (22 contestants)
Spain (17 contestants)
France (14 contestants)
Morocco (13 contestants)
Russia (12 contestants)
Netherlands (11 contestants)
Thailand (11 contestants)
Australia (10 contestants)
Germany (10 contestants)
Czech Republic (9 contestants)
Japan (9 contestants)
United Kingdom (9 contestants)
Indonesia (8 contestants)
Argentina (7 contestants)
China (7 contestants)
Hungary (7 contestants)
Iran (7 contestants)
Egypt (6 contestants)
Hong Kong (6 contestants)
Mexico (6 contestants)
Sweden (6 contestants)
Vietnam (6 contestants)
Chile (5 contestants)
Italy (5 contestants)
Poland (5 contestants)
Romania (5 contestants)
Canada (4 contestants)
Greece (4 contestants)
Slovakia (4 contestants)
South Africa (4 contestants)
Colombia (3 contestants)
Ireland (3 contestants)
Norway (3 contestants)
Ukraine (3 contestants)
Ecuador (2 contestants)
Guatemala (2 contestants)
Kenya (2 contestants)
Lithuania (2 contestants)
Philippines (2 contestants)
Portugal (2 contestants)
Serbia (2 contestants)
Singapore (2 contestants)
Sri Lanka (2 contestants)
Taiwan (2 contestants)
Turkey (2 contestants)
Venezuela (2 contestants)
Azerbaijan (1 contestant)
Belarus (1 contestant)
Belgium (1 contestant)
Bolivia (1 contestant)
Bulgaria (1 contestant)
Croatia (1 contestant)
Cyprus (1 contestant)
Ghana (1 contestant)
Latvia (1 contestant)
Malaysia (1 contestant)
Pakistan (1 contestant)
Palestinian Territory (1 contestant)
Peru (1 contestant)
Saudi Arabia (1 contestant)
Uruguay (1 contestant)