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Problems solved

Qualification Round (368 solutions by 143 contestants):
Round 1A (37 solutions by 19 contestants):
Round 1B (101 solutions by 40 contestants):
Round 1C (61 solutions by 26 contestants):
Round 2 (13 solutions by 7 contestants):

Submission Origin

United States (26 contestants)
India (18 contestants)
China (13 contestants)
Japan (13 contestants)
Brazil (12 contestants)
Canada (8 contestants)
Russia (7 contestants)
Australia (5 contestants)
Germany (5 contestants)
Israel (5 contestants)
Taiwan (5 contestants)
France (3 contestants)
Poland (3 contestants)
Portugal (3 contestants)
Spain (3 contestants)
Hungary (2 contestants)
Netherlands (2 contestants)
United Kingdom (2 contestants)
Austria (1 contestant)
Bulgaria (1 contestant)
Chile (1 contestant)
Colombia (1 contestant)
Dominican Republic (1 contestant)
Estonia (1 contestant)
Greece (1 contestant)
Indonesia (1 contestant)
Ireland (1 contestant)
Mexico (1 contestant)
Moldova (1 contestant)
New Zealand (1 contestant)
Norway (1 contestant)
Romania (1 contestant)
Slovakia (1 contestant)
South Korea (1 contestant)
Sri Lanka (1 contestant)
Turkey (1 contestant)
Vietnam (1 contestant)
Zimbabwe (1 contestant)