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Problems solved

Qualification Round (37984 solutions by 9293 contestants):
  • Tic-Tac-Toe-Tomek: 8530 small solutions, 7051 large solutions.
  • Lawnmower: 6089 small solutions, 5255 large solutions.
  • Fair and Square: 6904 small solutions, 2961 large-1 solutions, 304 large-2 solutions.
  • Treasure: 809 small solutions, 81 large solutions.
Round 1A (5904 solutions by 2781 contestants):
Round 1B (5950 solutions by 2518 contestants):
Round 1C (5428 solutions by 2259 contestants):
  • Consonants: 2164 small solutions, 1056 large solutions.
  • Pogo: 1480 small solutions, 78 large solutions.
  • The Great Wall: 586 small solutions, 64 large solutions.
Round 2 (3712 solutions by 1315 contestants):
Round 3 (714 solutions by 247 contestants):
Final (71 solutions by 17 contestants):

Submission Origin

India (1995 contestants)
China (1844 contestants)
United States (614 contestants)
Russia (477 contestants)
Japan (334 contestants)
Poland (274 contestants)
Bangladesh (254 contestants)
South Korea (248 contestants)
Taiwan (235 contestants)
Brazil (230 contestants)
Egypt (228 contestants)
Ukraine (212 contestants)
Canada (139 contestants)
France (131 contestants)
Indonesia (119 contestants)
Thailand (109 contestants)
Romania (104 contestants)
Hong Kong (100 contestants)
Germany (87 contestants)
Iran (82 contestants)
Vietnam (79 contestants)
Australia (74 contestants)
Argentina (73 contestants)
Belarus (71 contestants)
Mexico (67 contestants)
Spain (64 contestants)
Bulgaria (63 contestants)
Slovakia (61 contestants)
United Kingdom (60 contestants)
Colombia (55 contestants)
Pakistan (52 contestants)
Turkey (50 contestants)
Georgia (46 contestants)
Peru (46 contestants)
Singapore (46 contestants)
Croatia (43 contestants)
Hungary (41 contestants)
Greece (38 contestants)
Czech Republic (36 contestants)
Italy (36 contestants)
Sweden (31 contestants)
Bolivia (30 contestants)
Israel (29 contestants)
Lithuania (29 contestants)
Netherlands (27 contestants)
Venezuela (26 contestants)
Kazakhstan (25 contestants)
Morocco (25 contestants)
Portugal (24 contestants)
Serbia (23 contestants)
Armenia (20 contestants)
Belgium (20 contestants)
Finland (19 contestants)
South Africa (19 contestants)
Palestinian Territory (18 contestants)
Chile (16 contestants)
Switzerland (16 contestants)
Latvia (15 contestants)
Lebanon (14 contestants)
Malaysia (13 contestants)
Moldova (13 contestants)
New Zealand (13 contestants)
Jordan (12 contestants)
Austria (11 contestants)
Denmark (11 contestants)
Mongolia (11 contestants)
Sri Lanka (11 contestants)
Azerbaijan (10 contestants)
Bosnia and Herzegovina (10 contestants)
Nigeria (10 contestants)
Philippines (10 contestants)
Slovenia (10 contestants)
Dominican Republic (9 contestants)
Norway (8 contestants)
Estonia (7 contestants)
Iceland (6 contestants)
Nepal (6 contestants)
Cameroon (5 contestants)
Algeria (4 contestants)
Tunisia (4 contestants)
Albania (3 contestants)
Angola (3 contestants)
Ireland (3 contestants)
Uzbekistan (3 contestants)
Andorra (2 contestants)
Botswana (2 contestants)
Burundi (2 contestants)
Cyprus (2 contestants)
Kyrgyzstan (2 contestants)
Luxembourg (2 contestants)
Macau (2 contestants)
Mauritius (2 contestants)
North Korea (2 contestants)
Rwanda (2 contestants)
Trinidad and Tobago (2 contestants)
Turkmenistan (2 contestants)
Vatican City (2 contestants)
Zimbabwe (2 contestants)
Afghanistan (1 contestant)
Anguilla (1 contestant)
Benin (1 contestant)
Costa Rica (1 contestant)
Ethiopia (1 contestant)
Gabon (1 contestant)
Guyana (1 contestant)
Honduras (1 contestant)
Ivory Coast (1 contestant)
Jamaica (1 contestant)
Kenya (1 contestant)
Kuwait (1 contestant)
Liberia (1 contestant)
Macedonia (1 contestant)
Malawi (1 contestant)
Malta (1 contestant)
Montenegro (1 contestant)
Myanmar (1 contestant)
Nicaragua (1 contestant)
Oman (1 contestant)
Syria (1 contestant)
Tajikistan (1 contestant)
U.S. Virgin Islands (1 contestant)
Uganda (1 contestant)
United Arab Emirates (1 contestant)
Uruguay (1 contestant)
Western Sahara (1 contestant)
Yemen (1 contestant)
Zambia (1 contestant)