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Problems solved

Qualification Round (10186 solutions by 2900 contestants):
Round 1A (2631 solutions by 1123 contestants):
Round 1B (1973 solutions by 796 contestants):
Round 1C (2070 solutions by 931 contestants):
Round 2 (4204 solutions by 1217 contestants):
Round 3 (1746 solutions by 682 contestants):
APAC Semifinal (360 solutions by 133 contestants):
AMER Semifinal (258 solutions by 77 contestants):
EMEA Semifinal (502 solutions by 157 contestants):
World Finals (409 solutions by 74 contestants):

Submission Origin

China (665 contestants)
India (463 contestants)
United States (269 contestants)
Russia (192 contestants)
Poland (134 contestants)
Brazil (103 contestants)
Ukraine (99 contestants)
Japan (98 contestants)
South Korea (96 contestants)
Germany (52 contestants)
Canada (49 contestants)
Romania (48 contestants)
Taiwan (43 contestants)
Bulgaria (42 contestants)
Argentina (38 contestants)
Egypt (38 contestants)
Bangladesh (37 contestants)
Spain (32 contestants)
Slovakia (31 contestants)
Hong Kong (29 contestants)
Mexico (29 contestants)
Belarus (28 contestants)
Australia (27 contestants)
United Kingdom (25 contestants)
France (23 contestants)
Hungary (23 contestants)
Venezuela (22 contestants)
Singapore (21 contestants)
Thailand (20 contestants)
Indonesia (19 contestants)
Colombia (18 contestants)
Italy (17 contestants)
Pakistan (17 contestants)
Peru (16 contestants)
Portugal (16 contestants)
Netherlands (15 contestants)
Sweden (13 contestants)
Serbia and Montenegro (12 contestants)
South Africa (12 contestants)
Georgia (11 contestants)
Croatia (10 contestants)
Turkey (9 contestants)
Czech Republic (8 contestants)
New Zealand (8 contestants)
Vietnam (8 contestants)
Israel (7 contestants)
Lithuania (7 contestants)
Sri Lanka (7 contestants)
Denmark (5 contestants)
Estonia (5 contestants)
Greece (5 contestants)
Kazakhstan (5 contestants)
Latvia (5 contestants)
Austria (4 contestants)
Malaysia (4 contestants)
Bolivia (3 contestants)
Lebanon (3 contestants)
Norway (3 contestants)
Switzerland (3 contestants)
United Arab Emirates (3 contestants)
Armenia (2 contestants)
Belgium (2 contestants)
Chile (2 contestants)
Finland (2 contestants)
Ireland (2 contestants)
Macedonia (2 contestants)
Moldova (2 contestants)
Morocco (2 contestants)
Philippines (2 contestants)
Saudi Arabia (2 contestants)
Afghanistan (1 contestant)
Aruba (1 contestant)
Azerbaijan (1 contestant)
Bosnia and Herzegovina (1 contestant)
Cambodia (1 contestant)
Dominican Republic (1 contestant)
Iceland (1 contestant)
Iraq (1 contestant)
Kuwait (1 contestant)
Malta (1 contestant)
Nigeria (1 contestant)
Palestinian Territory (1 contestant)
Uruguay (1 contestant)
Virgin Islands (1 contestant)
Zimbabwe (1 contestant)