Round 1A: Numbers

577 correct small sets and 96 correct large sets. View problem statement or contest analysis.

Compact solutions

Solved in...

C++ (371 sets)
Java (116 sets)
Python (64 sets)
C (24 sets)
Perl (23 sets)
C# (16 sets)
PHP (11 sets)
Pascal (10 sets)
Ruby (8 sets)
Haskell (7 sets)
Shell (4 sets)
Mathematica (3 sets)
PL/SQL (2 sets)
Visual Basic (2 sets)
bc (1 set)
J (1 set)
Lisp (1 set)
Lua (1 set)
MATLAB (1 set)
R (1 set)

Submission Origin

China (178 contestants)
United States (113 contestants)
Russia (37 contestants)
Brazil (22 contestants)
Australia (18 contestants)
Argentina (15 contestants)
Ukraine (14 contestants)
Canada (13 contestants)
Japan (13 contestants)
Poland (13 contestants)
India (12 contestants)
South Korea (11 contestants)
Colombia (9 contestants)
Taiwan (9 contestants)
Mexico (7 contestants)
Singapore (7 contestants)
Germany (6 contestants)
New Zealand (6 contestants)
Slovakia (6 contestants)
Hong Kong (5 contestants)
Thailand (5 contestants)
Venezuela (5 contestants)
United Kingdom (4 contestants)
Belarus (3 contestants)
Egypt (3 contestants)
France (3 contestants)
Georgia (3 contestants)
Indonesia (3 contestants)
Israel (3 contestants)
Switzerland (3 contestants)
Peru (2 contestants)
Portugal (2 contestants)
Romania (2 contestants)
South Africa (2 contestants)
Spain (2 contestants)
Bangladesh (1 contestant)
Bolivia (1 contestant)
Bulgaria (1 contestant)
Cambodia (1 contestant)
Chile (1 contestant)
Croatia (1 contestant)
Dominican Republic (1 contestant)
Estonia (1 contestant)
Finland (1 contestant)
Latvia (1 contestant)
Macedonia (1 contestant)
Malaysia (1 contestant)
Norway (1 contestant)
Palestinian Territory (1 contestant)
Saudi Arabia (1 contestant)
Serbia and Montenegro (1 contestant)
Slovenia (1 contestant)
Vietnam (1 contestant)