I agree with @xyldke

@Retudin, as you wish. It could be least max regret if you prefer :)

@Lucenaposition, yes that is right :)

@VictorStafusa, please have a look at the edit of the puzzle, created thanks to your answer :) Also, note that I find Jasen's comment very relevant (why are you changing the calculation rules for the second part? shouldn't you be looking for the pair of countries with)

@z100, wow very nice link, thanks for sharing :) should I close/delete my puzzle?