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Problems solved

Qualification Round (517 solutions by 154 contestants):
Round 1A (30 solutions by 15 contestants):
Round 1B (95 solutions by 42 contestants):
Round 1C (30 solutions by 14 contestants):

Submission Origin

India (17 contestants)
France (12 contestants)
United States (10 contestants)
Spain (8 contestants)
Thailand (8 contestants)
Ukraine (7 contestants)
Australia (5 contestants)
Brazil (5 contestants)
Netherlands (4 contestants)
United Kingdom (4 contestants)
Argentina (3 contestants)
Bolivia (3 contestants)
Canada (3 contestants)
Egypt (3 contestants)
Hong Kong (3 contestants)
Malaysia (3 contestants)
Mexico (3 contestants)
Nigeria (3 contestants)
Singapore (3 contestants)
South Africa (3 contestants)
Taiwan (3 contestants)
Chile (2 contestants)
China (2 contestants)
Ecuador (2 contestants)
Greece (2 contestants)
Indonesia (2 contestants)
Morocco (2 contestants)
Pakistan (2 contestants)
Romania (2 contestants)
Russia (2 contestants)
Venezuela (2 contestants)
Albania (1 contestant)
Armenia (1 contestant)
Austria (1 contestant)
Bangladesh (1 contestant)
Bulgaria (1 contestant)
Colombia (1 contestant)
Czech Republic (1 contestant)
Estonia (1 contestant)
Germany (1 contestant)
Hungary (1 contestant)
Iran (1 contestant)
Israel (1 contestant)
Japan (1 contestant)
Latvia (1 contestant)
Lebanon (1 contestant)
Lithuania (1 contestant)
Moldova (1 contestant)
Nepal (1 contestant)
Poland (1 contestant)
Portugal (1 contestant)
Slovakia (1 contestant)
South Korea (1 contestant)
Sri Lanka (1 contestant)
Tajikistan (1 contestant)
Vietnam (1 contestant)