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Problems solved

Qualification Round (3376 solutions by 806 contestants):
Round 1A (263 solutions by 111 contestants):
Round 1B (662 solutions by 251 contestants):
Round 1C (232 solutions by 90 contestants):
Round 2 (106 solutions by 39 contestants):

Submission Origin

United States (138 contestants)
India (64 contestants)
Japan (41 contestants)
Russia (33 contestants)
United Kingdom (32 contestants)
France (31 contestants)
Canada (30 contestants)
Israel (28 contestants)
Pakistan (28 contestants)
Poland (23 contestants)
Ukraine (23 contestants)
Germany (22 contestants)
Hungary (17 contestants)
Turkey (17 contestants)
Australia (15 contestants)
Brazil (14 contestants)
South Africa (14 contestants)
Spain (14 contestants)
Iran (13 contestants)
Egypt (12 contestants)
Italy (12 contestants)
Belarus (11 contestants)
Lithuania (11 contestants)
Netherlands (11 contestants)
New Zealand (9 contestants)
South Korea (9 contestants)
Vietnam (9 contestants)
China (8 contestants)
Denmark (8 contestants)
Nigeria (8 contestants)
Sweden (8 contestants)
Argentina (7 contestants)
Thailand (7 contestants)
Czech Republic (6 contestants)
Romania (6 contestants)
Austria (5 contestants)
Belgium (5 contestants)
Indonesia (5 contestants)
Slovakia (5 contestants)
Hong Kong (4 contestants)
Mexico (4 contestants)
Colombia (3 contestants)
Portugal (3 contestants)
Tajikistan (3 contestants)
Armenia (2 contestants)
Bulgaria (2 contestants)
Croatia (2 contestants)
Kazakhstan (2 contestants)
Latvia (2 contestants)
Malaysia (2 contestants)
Moldova (2 contestants)
Morocco (2 contestants)
Serbia (2 contestants)
Slovenia (2 contestants)
Taiwan (2 contestants)
? (1 contestant)
Albania (1 contestant)
Algeria (1 contestant)
Cuba (1 contestant)
Dominican Republic (1 contestant)
Ecuador (1 contestant)
Fiji (1 contestant)
Georgia (1 contestant)
Greece (1 contestant)
Guernsey (1 contestant)
Ireland (1 contestant)
Kosovo (1 contestant)
Lebanon (1 contestant)
Lesotho (1 contestant)
Macedonia (1 contestant)
Nepal (1 contestant)
Singapore (1 contestant)
Switzerland (1 contestant)
Tunisia (1 contestant)
United Arab Emirates (1 contestant)
Uzbekistan (1 contestant)