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Problems solved

Qualification Round (751 solutions by 190 contestants):
Round 1A (114 solutions by 47 contestants):
Round 1B (87 solutions by 43 contestants):
Round 1C (70 solutions by 38 contestants):
Round 2 (1 solution by 1 contestant):

Submission Origin

France (16 contestants)
India (16 contestants)
United States (15 contestants)
United Kingdom (9 contestants)
Thailand (8 contestants)
Germany (7 contestants)
Ukraine (7 contestants)
Russia (6 contestants)
Australia (5 contestants)
Hong Kong (5 contestants)
Indonesia (5 contestants)
Japan (5 contestants)
Canada (4 contestants)
China (4 contestants)
Hungary (4 contestants)
Mexico (4 contestants)
Netherlands (4 contestants)
Spain (4 contestants)
Taiwan (4 contestants)
Argentina (3 contestants)
Brazil (3 contestants)
Egypt (3 contestants)
Malaysia (3 contestants)
Slovakia (3 contestants)
Sri Lanka (3 contestants)
Bangladesh (2 contestants)
Belgium (2 contestants)
Bulgaria (2 contestants)
Colombia (2 contestants)
Czech Republic (2 contestants)
Georgia (2 contestants)
Greece (2 contestants)
Iran (2 contestants)
Italy (2 contestants)
Kosovo (2 contestants)
Pakistan (2 contestants)
Portugal (2 contestants)
Romania (2 contestants)
South Korea (2 contestants)
Tunisia (2 contestants)
Albania (1 contestant)
Armenia (1 contestant)
Austria (1 contestant)
Belarus (1 contestant)
Bolivia (1 contestant)
Chile (1 contestant)
Costa Rica (1 contestant)
Denmark (1 contestant)
Estonia (1 contestant)
Ethiopia (1 contestant)
Israel (1 contestant)
Latvia (1 contestant)
Lebanon (1 contestant)
Moldova (1 contestant)
Morocco (1 contestant)
New Zealand (1 contestant)
Peru (1 contestant)
Philippines (1 contestant)
Poland (1 contestant)
Tanzania (1 contestant)
Togo (1 contestant)
Trinidad and Tobago (1 contestant)