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Problems solved

Qualification Round (427 solutions by 177 contestants):
Round 1A (36 solutions by 17 contestants):
Round 1B (5 solutions by 3 contestants):
Round 1C (31 solutions by 16 contestants):

Submission Origin

United States (21 contestants)
India (16 contestants)
France (9 contestants)
Mexico (8 contestants)
Thailand (8 contestants)
United Kingdom (8 contestants)
Germany (6 contestants)
Russia (6 contestants)
Brazil (5 contestants)
Egypt (5 contestants)
Spain (5 contestants)
Ukraine (5 contestants)
Iran (4 contestants)
Japan (4 contestants)
Taiwan (4 contestants)
Canada (3 contestants)
China (3 contestants)
Greece (3 contestants)
Netherlands (3 contestants)
Pakistan (3 contestants)
Romania (3 contestants)
Australia (2 contestants)
Estonia (2 contestants)
Indonesia (2 contestants)
Ireland (2 contestants)
Italy (2 contestants)
Philippines (2 contestants)
Poland (2 contestants)
Venezuela (2 contestants)
Albania (1 contestant)
Antarctica (1 contestant)
Argentina (1 contestant)
Austria (1 contestant)
Bangladesh (1 contestant)
Bolivia (1 contestant)
Bulgaria (1 contestant)
Chile (1 contestant)
Ecuador (1 contestant)
Ethiopia (1 contestant)
Guatemala (1 contestant)
Israel (1 contestant)
Ivory Coast (1 contestant)
Kenya (1 contestant)
Latvia (1 contestant)
Malaysia (1 contestant)
Morocco (1 contestant)
Nepal (1 contestant)
Nigeria (1 contestant)
Palestine (1 contestant)
Paraguay (1 contestant)
Peru (1 contestant)
Portugal (1 contestant)
Serbia (1 contestant)
Singapore (1 contestant)
Sri Lanka (1 contestant)
Turkey (1 contestant)
United Arab Emirates (1 contestant)
Uzbekistan (1 contestant)
Vietnam (1 contestant)
Yemen (1 contestant)