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Problems solved

Qualification Round (3978 solutions by 1092 contestants):
Round 1A (371 solutions by 240 contestants):
Round 1B (340 solutions by 172 contestants):
Round 1C (342 solutions by 205 contestants):
Round 2 (79 solutions by 37 contestants):
Round 3 (6 solutions by 2 contestants):

Submission Origin

India (170 contestants)
United States (134 contestants)
Russia (47 contestants)
United Kingdom (42 contestants)
China (37 contestants)
Australia (36 contestants)
Ukraine (35 contestants)
Brazil (30 contestants)
Canada (30 contestants)
Japan (29 contestants)
Pakistan (29 contestants)
Germany (26 contestants)
Egypt (25 contestants)
Israel (25 contestants)
Poland (25 contestants)
Hungary (23 contestants)
Thailand (20 contestants)
Netherlands (19 contestants)
France (18 contestants)
Spain (17 contestants)
Indonesia (15 contestants)
South Africa (14 contestants)
Iran (13 contestants)
Argentina (12 contestants)
Mexico (12 contestants)
Belarus (10 contestants)
Hong Kong (10 contestants)
Nigeria (10 contestants)
Romania (10 contestants)
South Korea (10 contestants)
Colombia (9 contestants)
Czech Republic (9 contestants)
Belgium (8 contestants)
Turkey (8 contestants)
Latvia (7 contestants)
New Zealand (7 contestants)
Austria (6 contestants)
Denmark (6 contestants)
Greece (6 contestants)
Italy (6 contestants)
Serbia (6 contestants)
Singapore (6 contestants)
Slovakia (6 contestants)
Chile (5 contestants)
Lithuania (5 contestants)
Sweden (5 contestants)
Vietnam (5 contestants)
Malaysia (4 contestants)
Philippines (4 contestants)
Algeria (3 contestants)
Azerbaijan (3 contestants)
Bulgaria (3 contestants)
Croatia (3 contestants)
Portugal (3 contestants)
Togo (3 contestants)
Tunisia (3 contestants)
Venezuela (3 contestants)
Bangladesh (2 contestants)
Ethiopia (2 contestants)
Finland (2 contestants)
Iceland (2 contestants)
Ireland (2 contestants)
Jordan (2 contestants)
Kazakhstan (2 contestants)
Norway (2 contestants)
Palestinian Territory (2 contestants)
Peru (2 contestants)
Switzerland (2 contestants)
Taiwan (2 contestants)
Armenia (1 contestant)
Bolivia (1 contestant)
Cambodia (1 contestant)
Cyprus (1 contestant)
Dominican Republic (1 contestant)
Ecuador (1 contestant)
El Salvador (1 contestant)
Estonia (1 contestant)
Georgia (1 contestant)
Ghana (1 contestant)
Guadeloupe (1 contestant)
Guatemala (1 contestant)
Iraq (1 contestant)
Jamaica (1 contestant)
Kosovo (1 contestant)
Moldova (1 contestant)
Nicaragua (1 contestant)
Panama (1 contestant)
Slovenia (1 contestant)
Sri Lanka (1 contestant)
Uzbekistan (1 contestant)
Yemen (1 contestant)
Zimbabwe (1 contestant)