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Problems solved

Qualification Round (2587 solutions by 888 contestants):
Round 1A (173 solutions by 88 contestants):
Round 1B (343 solutions by 160 contestants):
Round 1C (68 solutions by 29 contestants):
Round 2 (36 solutions by 17 contestants):

Submission Origin

India (510 contestants)
United States (53 contestants)
South Korea (38 contestants)
Brazil (35 contestants)
China (26 contestants)
Japan (26 contestants)
Taiwan (19 contestants)
France (18 contestants)
Greece (18 contestants)
Australia (11 contestants)
Mexico (10 contestants)
Bangladesh (9 contestants)
Italy (9 contestants)
Hong Kong (7 contestants)
Romania (7 contestants)
Canada (6 contestants)
Russia (6 contestants)
Spain (6 contestants)
Hungary (5 contestants)
Sri Lanka (5 contestants)
Thailand (5 contestants)
Czech Republic (4 contestants)
Egypt (4 contestants)
Germany (4 contestants)
Israel (4 contestants)
Sweden (4 contestants)
Turkey (4 contestants)
Indonesia (3 contestants)
Morocco (3 contestants)
Nepal (3 contestants)
New Zealand (3 contestants)
Philippines (3 contestants)
Poland (3 contestants)
Portugal (3 contestants)
Switzerland (3 contestants)
Tunisia (3 contestants)
United Kingdom (3 contestants)
? (2 contestants)
Austria (2 contestants)
Iran (2 contestants)
Lithuania (2 contestants)
Norway (2 contestants)
Pakistan (2 contestants)
Peru (2 contestants)
Singapore (2 contestants)
Slovenia (2 contestants)
Venezuela (2 contestants)
Afghanistan (1 contestant)
Algeria (1 contestant)
Bahamas (1 contestant)
Belarus (1 contestant)
Croatia (1 contestant)
Dominican Republic (1 contestant)
Finland (1 contestant)
Kazakhstan (1 contestant)
Latvia (1 contestant)
Macau (1 contestant)
Macedonia (1 contestant)
Martinique (1 contestant)
Moldova (1 contestant)
Netherlands (1 contestant)
Togo (1 contestant)
Ukraine (1 contestant)
Vatican City (1 contestant)
Vietnam (1 contestant)