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Problems solved

Qualification Round (688 solutions by 235 contestants):
Round 1A (18 solutions by 13 contestants):
Round 1B (70 solutions by 43 contestants):
Round 1C (26 solutions by 18 contestants):
Round 2 (1 solution by 1 contestant):

Submission Origin

United States (24 contestants)
India (22 contestants)
Ukraine (12 contestants)
Brazil (10 contestants)
Japan (10 contestants)
Netherlands (10 contestants)
France (9 contestants)
Romania (9 contestants)
Thailand (9 contestants)
Australia (8 contestants)
Spain (8 contestants)
United Kingdom (7 contestants)
Latvia (6 contestants)
Indonesia (5 contestants)
Slovakia (5 contestants)
Germany (4 contestants)
Mexico (4 contestants)
Morocco (4 contestants)
Russia (4 contestants)
Turkey (4 contestants)
Argentina (3 contestants)
Chile (3 contestants)
China (3 contestants)
Iran (3 contestants)
New Zealand (3 contestants)
Philippines (3 contestants)
Poland (3 contestants)
South Korea (3 contestants)
Azerbaijan (2 contestants)
Bulgaria (2 contestants)
Canada (2 contestants)
Czech Republic (2 contestants)
Egypt (2 contestants)
Estonia (2 contestants)
Hong Kong (2 contestants)
Hungary (2 contestants)
Ireland (2 contestants)
Italy (2 contestants)
Sri Lanka (2 contestants)
Taiwan (2 contestants)
Vietnam (2 contestants)
Albania (1 contestant)
Algeria (1 contestant)
Austria (1 contestant)
Belarus (1 contestant)
Belgium (1 contestant)
Ecuador (1 contestant)
Ghana (1 contestant)
Greece (1 contestant)
Israel (1 contestant)
Malaysia (1 contestant)
Nigeria (1 contestant)
Norway (1 contestant)
Portugal (1 contestant)
Serbia (1 contestant)
Singapore (1 contestant)
South Africa (1 contestant)
Sweden (1 contestant)