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Problems solved

Qualification Round (434 solutions by 138 contestants):
Round 1A (30 solutions by 20 contestants):
Round 1B (45 solutions by 30 contestants):
Round 1C (29 solutions by 16 contestants):
Round 2 (6 solutions by 3 contestants):

Submission Origin

United States (31 contestants)
India (30 contestants)
Japan (18 contestants)
China (12 contestants)
France (5 contestants)
South Korea (5 contestants)
Taiwan (5 contestants)
United Kingdom (4 contestants)
Russia (3 contestants)
Canada (2 contestants)
Czech Republic (2 contestants)
Hong Kong (2 contestants)
Israel (2 contestants)
Philippines (2 contestants)
Spain (2 contestants)
Sweden (2 contestants)
Antigua and Barbuda (1 contestant)
Aruba (1 contestant)
Australia (1 contestant)
Belgium (1 contestant)
Cyprus (1 contestant)
Dominican Republic (1 contestant)
Germany (1 contestant)
Ireland (1 contestant)
Latvia (1 contestant)
New Zealand (1 contestant)
Norway (1 contestant)
Poland (1 contestant)
Portugal (1 contestant)
Romania (1 contestant)
Slovakia (1 contestant)
Turkey (1 contestant)
Ukraine (1 contestant)