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Problems solved

Qualification Round (5416 solutions by 1871 contestants):
Round 1A (106 solutions by 65 contestants):
Round 1B (566 solutions by 405 contestants):
Round 1C (296 solutions by 172 contestants):
Round 2 (84 solutions by 27 contestants):

Submission Origin

India (1091 contestants)
China (115 contestants)
United States (89 contestants)
Brazil (67 contestants)
Taiwan (55 contestants)
South Korea (48 contestants)
Japan (26 contestants)
Cameroon (25 contestants)
Thailand (24 contestants)
Romania (23 contestants)
Greece (22 contestants)
Italy (21 contestants)
Canada (19 contestants)
France (17 contestants)
Russia (17 contestants)
Australia (16 contestants)
Mexico (16 contestants)
Poland (14 contestants)
Hong Kong (13 contestants)
Turkey (12 contestants)
Portugal (11 contestants)
Egypt (10 contestants)
New Zealand (9 contestants)
Sweden (9 contestants)
United Kingdom (9 contestants)
Slovakia (8 contestants)
Spain (8 contestants)
Sri Lanka (8 contestants)
Bangladesh (7 contestants)
Czech Republic (6 contestants)
Germany (6 contestants)
Indonesia (6 contestants)
Morocco (6 contestants)
Tunisia (6 contestants)
Israel (5 contestants)
Netherlands (5 contestants)
Philippines (5 contestants)
Argentina (4 contestants)
Hungary (4 contestants)
Switzerland (4 contestants)
Algeria (3 contestants)
Austria (3 contestants)
Belarus (3 contestants)
Belgium (3 contestants)
Bolivia (3 contestants)
Croatia (3 contestants)
Pakistan (3 contestants)
Vietnam (3 contestants)
Finland (2 contestants)
Ireland (2 contestants)
Latvia (2 contestants)
Lithuania (2 contestants)
Luxembourg (2 contestants)
Nepal (2 contestants)
Serbia (2 contestants)
South Africa (2 contestants)
Ukraine (2 contestants)
Venezuela (2 contestants)
Chile (1 contestant)
Costa Rica (1 contestant)
Denmark (1 contestant)
Dominican Republic (1 contestant)
Ecuador (1 contestant)
Estonia (1 contestant)
Gabon (1 contestant)
Iceland (1 contestant)
Malaysia (1 contestant)
Mauritius (1 contestant)
Moldova (1 contestant)
Nigeria (1 contestant)
Norway (1 contestant)
Peru (1 contestant)
Seychelles (1 contestant)
Singapore (1 contestant)
Slovenia (1 contestant)
Tanzania (1 contestant)
Trinidad and Tobago (1 contestant)
Zambia (1 contestant)