Final: Upstairs/Downstairs

21 correct small sets and 16 correct large sets. View problem statement or contest analysis.

Compact solutions

Solved in...

C++ (32 sets)
D (2 sets)
Java (2 sets)
C# (1 set)

Submission Origin

Russia (4 contestants)
Ukraine (3 contestants)
Japan (3 contestants)
China (3 contestants)
United States (2 contestants)
South Africa (1 contestant)
Slovakia (1 contestant)
Poland (1 contestant)
Hong Kong (1 contestant)
Canada (1 contestant)
Bulgaria (1 contestant)