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Problems solved

Qualification Round (13498 solutions by 4317 contestants):
Round 1A (1634 solutions by 692 contestants):
Round 1B (1264 solutions by 550 contestants):
Round 1C (1255 solutions by 600 contestants):
Round 2 (802 solutions by 287 contestants):
Round 3 (119 solutions by 52 contestants):
Final (13 solutions by 2 contestants):

Submission Origin

India (850 contestants)
United States (695 contestants)
China (211 contestants)
Egypt (197 contestants)
Russia (156 contestants)
Japan (114 contestants)
Brazil (108 contestants)
Canada (105 contestants)
France (84 contestants)
Colombia (83 contestants)
Spain (79 contestants)
Germany (75 contestants)
Indonesia (75 contestants)
South Korea (71 contestants)
Australia (70 contestants)
Thailand (67 contestants)
Ukraine (62 contestants)
Sri Lanka (60 contestants)
Poland (49 contestants)
United Kingdom (47 contestants)
New Zealand (41 contestants)
Sweden (39 contestants)
South Africa (38 contestants)
Israel (37 contestants)
Pakistan (36 contestants)
Taiwan (36 contestants)
Hong Kong (35 contestants)
Italy (35 contestants)
Mexico (35 contestants)
Morocco (35 contestants)
Singapore (34 contestants)
Vietnam (34 contestants)
... (33 contestants)
Romania (33 contestants)
Hungary (32 contestants)
Turkey (32 contestants)
Netherlands (30 contestants)
Greece (26 contestants)
Belarus (23 contestants)
Belgium (23 contestants)
Philippines (20 contestants)
Slovakia (20 contestants)
Iran (18 contestants)
Nigeria (18 contestants)
Portugal (18 contestants)
Kazakhstan (17 contestants)
Norway (16 contestants)
Tunisia (15 contestants)
Czech Republic (14 contestants)
Switzerland (14 contestants)
Venezuela (14 contestants)
Austria (13 contestants)
Macedonia (13 contestants)
Peru (13 contestants)
Argentina (12 contestants)
Croatia (12 contestants)
Malaysia (12 contestants)
Lithuania (11 contestants)
Bangladesh (10 contestants)
Estonia (10 contestants)
Kenya (10 contestants)
Bolivia (9 contestants)
Ghana (9 contestants)
Palestinian Territory (8 contestants)
Ireland (7 contestants)
Lebanon (7 contestants)
Georgia (6 contestants)
Guatemala (6 contestants)
Serbia (6 contestants)
Bulgaria (5 contestants)
Denmark (5 contestants)
Ecuador (5 contestants)
Kuwait (5 contestants)
Latvia (5 contestants)
Slovenia (5 contestants)
Angola (4 contestants)
Azerbaijan (4 contestants)
Cameroon (4 contestants)
Finland (4 contestants)
Moldova (4 contestants)
Albania (3 contestants)
Benin (3 contestants)
Chile (3 contestants)
Costa Rica (3 contestants)
Dominican Republic (3 contestants)
Madagascar (3 contestants)
Nepal (3 contestants)
Togo (3 contestants)
Uganda (3 contestants)
Andorra (2 contestants)
Armenia (2 contestants)
Ethiopia (2 contestants)
Nicaragua (2 contestants)
Saudi Arabia (2 contestants)
Senegal (2 contestants)
United Arab Emirates (2 contestants)
Uruguay (2 contestants)
Uzbekistan (2 contestants)
Zimbabwe (2 contestants)
Afghanistan (1 contestant)
Cambodia (1 contestant)
Cyprus (1 contestant)
El Salvador (1 contestant)
Ivory Coast (1 contestant)
Jordan (1 contestant)
Kosovo (1 contestant)
Laos (1 contestant)
Macau (1 contestant)
Malta (1 contestant)
Mauritius (1 contestant)
Mongolia (1 contestant)
Mozambique (1 contestant)
Namibia (1 contestant)
Oman (1 contestant)
Paraguay (1 contestant)
Puerto Rico (1 contestant)
Rwanda (1 contestant)
Sudan (1 contestant)
Trinidad and Tobago (1 contestant)
Yemen (1 contestant)