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Problems solved

Qualification Round (543 solutions by 205 contestants):
Round 1A (50 solutions by 26 contestants):
Round 1B (21 solutions by 13 contestants):
Round 1C (34 solutions by 18 contestants):
Round 2 (4 solutions by 2 contestants):

Submission Origin

United States (45 contestants)
India (30 contestants)
Japan (26 contestants)
Russia (12 contestants)
China (10 contestants)
Taiwan (9 contestants)
Australia (6 contestants)
Canada (5 contestants)
Germany (5 contestants)
... (4 contestants)
United Kingdom (4 contestants)
Brazil (3 contestants)
Spain (3 contestants)
Sweden (3 contestants)
Ukraine (3 contestants)
Belgium (2 contestants)
Chile (2 contestants)
Hong Kong (2 contestants)
Israel (2 contestants)
Netherlands (2 contestants)
New Zealand (2 contestants)
Poland (2 contestants)
Portugal (2 contestants)
Romania (2 contestants)
Thailand (2 contestants)
Argentina (1 contestant)
Colombia (1 contestant)
Denmark (1 contestant)
Dominican Republic (1 contestant)
France (1 contestant)
Ghana (1 contestant)
Hungary (1 contestant)
Indonesia (1 contestant)
Iran (1 contestant)
Ireland (1 contestant)
Jordan (1 contestant)
Mexico (1 contestant)
Norway (1 contestant)
Sierra Leone (1 contestant)
South Korea (1 contestant)
Switzerland (1 contestant)
Turkey (1 contestant)
Uruguay (1 contestant)
Vietnam (1 contestant)
Zimbabwe (1 contestant)