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Problems solved

Qualification Round (235 solutions by 91 contestants):
Round 1A (43 solutions by 18 contestants):
Round 1B (16 solutions by 7 contestants):
Round 1C (22 solutions by 11 contestants):
Round 2 (11 solutions by 4 contestants):

Submission Origin

United States (23 contestants)
Japan (12 contestants)
India (10 contestants)
France (7 contestants)
Australia (3 contestants)
China (3 contestants)
South Korea (3 contestants)
Taiwan (3 contestants)
Armenia (2 contestants)
Canada (2 contestants)
Philippines (2 contestants)
Portugal (2 contestants)
Russia (2 contestants)
Turkey (2 contestants)
United Kingdom (2 contestants)
Brazil (1 contestant)
Dominican Republic (1 contestant)
Germany (1 contestant)
Hong Kong (1 contestant)
Ireland (1 contestant)
Israel (1 contestant)
Latvia (1 contestant)
Lebanon (1 contestant)
Mexico (1 contestant)
Netherlands (1 contestant)
Pakistan (1 contestant)
Poland (1 contestant)
Romania (1 contestant)
Slovakia (1 contestant)
Sweden (1 contestant)
Switzerland (1 contestant)