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Problems solved

Qualification Round (2131 solutions by 637 contestants):
Round 1A (276 solutions by 170 contestants):
Round 1B (224 solutions by 139 contestants):
Round 1C (419 solutions by 210 contestants):
Round 2 (253 solutions by 96 contestants):
Round 3 (73 solutions by 32 contestants):
APAC Semifinal (2 solutions by 2 contestants):
AMER Semifinal (8 solutions by 3 contestants):
EMEA Semifinal (26 solutions by 9 contestants):
World Finals (7 solutions by 1 contestant):

Submission Origin

India (102 contestants)
United States (98 contestants)
Russia (46 contestants)
China (37 contestants)
Brazil (28 contestants)
Canada (25 contestants)
Ukraine (20 contestants)
Thailand (17 contestants)
Australia (16 contestants)
Czech Republic (16 contestants)
Hungary (16 contestants)
Pakistan (16 contestants)
Poland (14 contestants)
United Kingdom (14 contestants)
Israel (10 contestants)
Romania (10 contestants)
Colombia (9 contestants)
Egypt (9 contestants)
Mexico (9 contestants)
Argentina (8 contestants)
South Korea (7 contestants)
Spain (7 contestants)
Germany (6 contestants)
Italy (6 contestants)
Jordan (6 contestants)
Japan (5 contestants)
South Africa (5 contestants)
Vietnam (5 contestants)
Belarus (4 contestants)
Denmark (4 contestants)
France (4 contestants)
Moldova (4 contestants)
Serbia and Montenegro (4 contestants)
Sri Lanka (4 contestants)
Algeria (3 contestants)
Austria (3 contestants)
Indonesia (3 contestants)
Saudi Arabia (3 contestants)
Switzerland (3 contestants)
Uruguay (3 contestants)
Bangladesh (2 contestants)
Chile (2 contestants)
Greece (2 contestants)
Lebanon (2 contestants)
Lithuania (2 contestants)
Netherlands (2 contestants)
Philippines (2 contestants)
Portugal (2 contestants)
Singapore (2 contestants)
Slovakia (2 contestants)
Sweden (2 contestants)
Taiwan (2 contestants)
United Arab Emirates (2 contestants)
Venezuela (2 contestants)
Albania (1 contestant)
Azerbaijan (1 contestant)
Belgium (1 contestant)
Bulgaria (1 contestant)
Croatia (1 contestant)
Cyprus (1 contestant)
Hong Kong (1 contestant)
Iceland (1 contestant)
Ireland (1 contestant)
Kyrgyzstan (1 contestant)
Latvia (1 contestant)
New Zealand (1 contestant)
Peru (1 contestant)
Puerto Rico (1 contestant)
Turkey (1 contestant)
Uzbekistan (1 contestant)