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Problems solved

Qualification Round (7684 solutions by 2761 contestants):
Round 1A (838 solutions by 353 contestants):
  • Rotate: 343 small solutions, 298 large solutions.
  • Make it Smooth: 54 small solutions, 34 large solutions.
  • Number Game: 85 small solutions, 24 large solutions.
Round 1B (2066 solutions by 701 contestants):
Round 1C (1461 solutions by 568 contestants):
Round 2 (624 solutions by 243 contestants):
Round 3 (138 solutions by 44 contestants):
World Final (36 solutions by 5 contestants):

Submission Origin

India (482 contestants)
China (399 contestants)
United States (281 contestants)
Russia (195 contestants)
Japan (113 contestants)
Brazil (90 contestants)
Ukraine (66 contestants)
Egypt (63 contestants)
Canada (55 contestants)
Vietnam (55 contestants)
Indonesia (49 contestants)
Poland (48 contestants)
Germany (45 contestants)
South Korea (44 contestants)
France (41 contestants)
Australia (37 contestants)
United Kingdom (36 contestants)
Colombia (34 contestants)
Romania (30 contestants)
Spain (30 contestants)
Israel (28 contestants)
Taiwan (28 contestants)
Mexico (27 contestants)
Thailand (25 contestants)
Argentina (22 contestants)
Belarus (22 contestants)
Netherlands (21 contestants)
Slovakia (21 contestants)
Hungary (20 contestants)
Kazakhstan (20 contestants)
Bangladesh (19 contestants)
Hong Kong (19 contestants)
Italy (18 contestants)
Norway (16 contestants)
Peru (16 contestants)
Venezuela (16 contestants)
Croatia (15 contestants)
South Africa (13 contestants)
Turkey (13 contestants)
Lithuania (12 contestants)
Pakistan (12 contestants)
Czech Republic (11 contestants)
Greece (11 contestants)
New Zealand (11 contestants)
Philippines (10 contestants)
Portugal (10 contestants)
Sri Lanka (10 contestants)
Austria (9 contestants)
Bulgaria (9 contestants)
Singapore (9 contestants)
Sweden (9 contestants)
Bolivia (8 contestants)
Belgium (7 contestants)
Chile (7 contestants)
Malaysia (7 contestants)
Moldova (7 contestants)
Macedonia (6 contestants)
Morocco (6 contestants)
Serbia (6 contestants)
Estonia (5 contestants)
Georgia (5 contestants)
Mongolia (5 contestants)
Palestinian Territory (5 contestants)
Switzerland (5 contestants)
Ecuador (4 contestants)
Guatemala (4 contestants)
Kenya (4 contestants)
Latvia (4 contestants)
Lebanon (4 contestants)
Nigeria (4 contestants)
Azerbaijan (3 contestants)
Dominican Republic (3 contestants)
Iran (3 contestants)
Rwanda (3 contestants)
Syria (3 contestants)
Uruguay (3 contestants)
Armenia (2 contestants)
Costa Rica (2 contestants)
El Salvador (2 contestants)
Ethiopia (2 contestants)
Iceland (2 contestants)
Kyrgyzstan (2 contestants)
Slovenia (2 contestants)
Tunisia (2 contestants)
Afghanistan (1 contestant)
Congo (1 contestant)
Cuba (1 contestant)
Cyprus (1 contestant)
Denmark (1 contestant)
Eritrea (1 contestant)
Finland (1 contestant)
Ghana (1 contestant)
Ireland (1 contestant)
Ivory Coast (1 contestant)
Jordan (1 contestant)
Laos (1 contestant)
Madagascar (1 contestant)
Mozambique (1 contestant)
Namibia (1 contestant)
Nepal (1 contestant)
Nicaragua (1 contestant)
Oman (1 contestant)
Trinidad and Tobago (1 contestant)
Uzbekistan (1 contestant)
Zimbabwe (1 contestant)