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Problems solved

Qualification Round (3095 solutions by 1147 contestants):
Round 1A (352 solutions by 167 contestants):
Round 1B (206 solutions by 107 contestants):
Round 1C (187 solutions by 100 contestants):
Round 2 (95 solutions by 37 contestants):
Round 3 (17 solutions by 6 contestants):

Submission Origin

India (482 contestants)
China (108 contestants)
United States (74 contestants)
Brazil (63 contestants)
Japan (36 contestants)
South Korea (30 contestants)
Taiwan (28 contestants)
Australia (21 contestants)
Mexico (21 contestants)
France (19 contestants)
Greece (19 contestants)
Canada (18 contestants)
Thailand (18 contestants)
Italy (13 contestants)
Hong Kong (12 contestants)
United Kingdom (11 contestants)
Morocco (10 contestants)
Portugal (10 contestants)
Romania (10 contestants)
Argentina (9 contestants)
Russia (9 contestants)
Indonesia (8 contestants)
Trinidad and Tobago (8 contestants)
... (6 contestants)
Venezuela (6 contestants)
Croatia (5 contestants)
Egypt (5 contestants)
Philippines (5 contestants)
Poland (5 contestants)
Spain (5 contestants)
Bangladesh (4 contestants)
Denmark (4 contestants)
Hungary (4 contestants)
New Zealand (4 contestants)
Singapore (4 contestants)
Slovakia (4 contestants)
Sri Lanka (4 contestants)
Sweden (4 contestants)
Turkey (4 contestants)
Belgium (3 contestants)
Cameroon (3 contestants)
Colombia (3 contestants)
Israel (3 contestants)
Latvia (3 contestants)
Switzerland (3 contestants)
Vietnam (3 contestants)
Algeria (2 contestants)
Austria (2 contestants)
Chile (2 contestants)
Czech Republic (2 contestants)
Finland (2 contestants)
Germany (2 contestants)
Ghana (2 contestants)
Iran (2 contestants)
Ireland (2 contestants)
Lithuania (2 contestants)
Luxembourg (2 contestants)
Malaysia (2 contestants)
Netherlands (2 contestants)
Tunisia (2 contestants)
Azerbaijan (1 contestant)
Belarus (1 contestant)
Bolivia (1 contestant)
Ecuador (1 contestant)
Estonia (1 contestant)
Georgia (1 contestant)
Ivory Coast (1 contestant)
Jordan (1 contestant)
Lebanon (1 contestant)
Macedonia (1 contestant)
Moldova (1 contestant)
Mongolia (1 contestant)
Montenegro (1 contestant)
Norway (1 contestant)
Peru (1 contestant)
Slovenia (1 contestant)
South Africa (1 contestant)
Turkmenistan (1 contestant)
Vatican City (1 contestant)