What should be the class name for Java submissions? "Main" or ..

doesn't matter.

[I. King of Africa] Is it possible to move all the people of same type from any row ..

yes

[J. No Points in Polygon] Description updates?

The second sentence of the problem description: "You need to make a cut connecting any two vertices of the given polygon such that area of the new polygon that contains none of the given points is maximized." To be replaced by: "You need to make a..

[G. Water Puzzle] Is the sample I/O correct?