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Problems solved

Qualification Round (348 solutions by 118 contestants):
Round 1A (53 solutions by 30 contestants):
Round 1B (5 solutions by 5 contestants):
Round 1C (54 solutions by 30 contestants):
Round 2 (5 solutions by 5 contestants):

Submission Origin

United States (19 contestants)
Germany (8 contestants)
Brazil (7 contestants)
France (6 contestants)
Thailand (6 contestants)
Argentina (5 contestants)
India (5 contestants)
Japan (5 contestants)
Netherlands (4 contestants)
Poland (4 contestants)
Russia (4 contestants)
South Africa (4 contestants)
Taiwan (4 contestants)
Vietnam (4 contestants)
Australia (3 contestants)
New Zealand (3 contestants)
Romania (3 contestants)
Ukraine (3 contestants)
Canada (2 contestants)
China (2 contestants)
Colombia (2 contestants)
Hungary (2 contestants)
Israel (2 contestants)
Mexico (2 contestants)
Moldova (2 contestants)
Spain (2 contestants)
Belarus (1 contestant)
Bulgaria (1 contestant)
Czech Republic (1 contestant)
Egypt (1 contestant)
Italy (1 contestant)
Jordan (1 contestant)
Lithuania (1 contestant)
Norway (1 contestant)
Paraguay (1 contestant)
Philippines (1 contestant)
Singapore (1 contestant)
South Korea (1 contestant)
United Kingdom (1 contestant)