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Problems solved

Qualification Round (1321 solutions by 414 contestants):
Round 1A (75 solutions by 47 contestants):
Round 1B (168 solutions by 85 contestants):
Round 1C (190 solutions by 85 contestants):
Round 2 (94 solutions by 38 contestants):
Round 3 (3 solutions by 2 contestants):

Submission Origin

India (121 contestants)
China (56 contestants)
Brazil (39 contestants)
United States (39 contestants)
Japan (20 contestants)
South Korea (17 contestants)
Romania (15 contestants)
Taiwan (11 contestants)
Thailand (10 contestants)
Australia (9 contestants)
Russia (8 contestants)
Hungary (7 contestants)
United Kingdom (7 contestants)
Argentina (6 contestants)
Canada (6 contestants)
Poland (6 contestants)
France (5 contestants)
Greece (5 contestants)
Netherlands (5 contestants)
Spain (5 contestants)
Portugal (4 contestants)
Slovakia (4 contestants)
Bangladesh (3 contestants)
Czech Republic (3 contestants)
Mexico (3 contestants)
Belarus (2 contestants)
Denmark (2 contestants)
Hong Kong (2 contestants)
Latvia (2 contestants)
Morocco (2 contestants)
Austria (1 contestant)
Chile (1 contestant)
Colombia (1 contestant)
Croatia (1 contestant)
Germany (1 contestant)
Ireland (1 contestant)
Israel (1 contestant)
Kenya (1 contestant)
Norway (1 contestant)
Pakistan (1 contestant)
Singapore (1 contestant)
South Africa (1 contestant)
Sri Lanka (1 contestant)
Turkey (1 contestant)
Ukraine (1 contestant)
Venezuela (1 contestant)
Vietnam (1 contestant)