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Problems solved

Qualification Round (4430 solutions by 1436 contestants):
Round 1A (386 solutions by 286 contestants):
Round 1B (252 solutions by 133 contestants):
Round 1C (275 solutions by 168 contestants):
Round 2 (53 solutions by 25 contestants):
Round 3 (11 solutions by 3 contestants):
Final (4 solutions by 1 contestant):

Submission Origin

India (679 contestants)
China (134 contestants)
United States (80 contestants)
Brazil (73 contestants)
Taiwan (48 contestants)
France (32 contestants)
Japan (32 contestants)
South Korea (32 contestants)
Australia (27 contestants)
Greece (24 contestants)
Canada (23 contestants)
Thailand (18 contestants)
Russia (16 contestants)
Portugal (15 contestants)
Hong Kong (13 contestants)
Italy (13 contestants)
Sweden (12 contestants)
Poland (11 contestants)
Bangladesh (10 contestants)
Romania (10 contestants)
Indonesia (9 contestants)
Israel (9 contestants)
Mexico (9 contestants)
Morocco (9 contestants)
United Kingdom (9 contestants)
Egypt (8 contestants)
Turkey (8 contestants)
Cameroon (6 contestants)
Argentina (5 contestants)
Croatia (5 contestants)
Spain (5 contestants)
Austria (4 contestants)
Germany (4 contestants)
Hungary (4 contestants)
Netherlands (4 contestants)
Slovakia (4 contestants)
Switzerland (4 contestants)
Tunisia (4 contestants)
Venezuela (4 contestants)
Algeria (3 contestants)
Belgium (3 contestants)
Chile (3 contestants)
Norway (3 contestants)
Philippines (3 contestants)
Singapore (3 contestants)
South Africa (3 contestants)
Vietnam (3 contestants)
Afghanistan (2 contestants)
Denmark (2 contestants)
Ireland (2 contestants)
Latvia (2 contestants)
Moldova (2 contestants)
New Zealand (2 contestants)
Nigeria (2 contestants)
North Korea (2 contestants)
Trinidad and Tobago (2 contestants)
Ukraine (2 contestants)
Anguilla (1 contestant)
Belarus (1 contestant)
British Virgin Islands (1 contestant)
Czech Republic (1 contestant)
Ecuador (1 contestant)
Equatorial Guinea (1 contestant)
Estonia (1 contestant)
Georgia (1 contestant)
Guyana (1 contestant)
Iran (1 contestant)
Kazakhstan (1 contestant)
Lebanon (1 contestant)
Lithuania (1 contestant)
Macau (1 contestant)
Micronesia (1 contestant)
Mongolia (1 contestant)
Serbia (1 contestant)
Slovenia (1 contestant)
Sri Lanka (1 contestant)
Turkmenistan (1 contestant)
Zambia (1 contestant)