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Problems solved

Qualification Round (15710 solutions by 4917 contestants):
Round 1A (3736 solutions by 1307 contestants):
  • Rotate: 1248 small solutions, 1144 large solutions.
  • Make it Smooth: 411 small solutions, 271 large solutions.
  • Number Game: 467 small solutions, 195 large solutions.
Round 1B (5191 solutions by 1499 contestants):
Round 1C (4495 solutions by 1548 contestants):
Round 2 (3867 solutions by 1411 contestants):
Round 3 (945 solutions by 304 contestants):
World Final (105 solutions by 18 contestants):

Submission Origin

China (1380 contestants)
India (742 contestants)
Russia (313 contestants)
United States (223 contestants)
Japan (192 contestants)
Poland (166 contestants)
Brazil (157 contestants)
South Korea (138 contestants)
Ukraine (133 contestants)
Bangladesh (117 contestants)
Taiwan (116 contestants)
Egypt (73 contestants)
Argentina (66 contestants)
Vietnam (64 contestants)
Romania (61 contestants)
Canada (60 contestants)
Indonesia (60 contestants)
Bulgaria (53 contestants)
Australia (52 contestants)
France (48 contestants)
Hong Kong (45 contestants)
Spain (43 contestants)
Germany (38 contestants)
Mexico (37 contestants)
Peru (37 contestants)
Turkey (37 contestants)
Belarus (35 contestants)
Thailand (35 contestants)
United Kingdom (33 contestants)
Slovakia (32 contestants)
Italy (31 contestants)
Croatia (30 contestants)
Hungary (26 contestants)
Venezuela (26 contestants)
Israel (22 contestants)
Colombia (21 contestants)
Kazakhstan (19 contestants)
Pakistan (18 contestants)
Portugal (18 contestants)
Lithuania (17 contestants)
South Africa (17 contestants)
Latvia (16 contestants)
Singapore (16 contestants)
Czech Republic (15 contestants)
Georgia (15 contestants)
Netherlands (15 contestants)
Bolivia (14 contestants)
Serbia (14 contestants)
Sweden (14 contestants)
Norway (13 contestants)
Iran (12 contestants)
Switzerland (11 contestants)
Finland (10 contestants)
New Zealand (10 contestants)
Denmark (9 contestants)
Estonia (9 contestants)
Armenia (8 contestants)
Greece (8 contestants)
Lebanon (8 contestants)
Slovenia (8 contestants)
Austria (7 contestants)
Malaysia (7 contestants)
Kyrgyzstan (5 contestants)
Bosnia and Herzegovina (4 contestants)
Macedonia (4 contestants)
Moldova (4 contestants)
Sri Lanka (4 contestants)
Dominican Republic (3 contestants)
Ireland (3 contestants)
Morocco (3 contestants)
Azerbaijan (2 contestants)
Cameroon (2 contestants)
Chile (2 contestants)
Ethiopia (2 contestants)
Jordan (2 contestants)
Mongolia (2 contestants)
Philippines (2 contestants)
Uzbekistan (2 contestants)
Afghanistan (1 contestant)
Angola (1 contestant)
Cambodia (1 contestant)
Cuba (1 contestant)
Ecuador (1 contestant)
Eritrea (1 contestant)
Ghana (1 contestant)
Haiti (1 contestant)
Honduras (1 contestant)
Iceland (1 contestant)
Ivory Coast (1 contestant)
Jamaica (1 contestant)
Malta (1 contestant)
Nepal (1 contestant)
Senegal (1 contestant)
Turkmenistan (1 contestant)
U.S. Virgin Islands (1 contestant)
Uganda (1 contestant)
Vatican City (1 contestant)