15 3
3 5 7

AC return "1", but the right answer is "2", isn't it ??

NO
the first man can get 5,then leave 10 stones.
if second man get 3 ,the firtst man get 7
if second man get 5 ,the firtst man get 5
if second man get 7 ,the firtst man get 3
so,right answer is "1"

The First man can get 5, then leave 10 stones:
 -> if Second man get 3, the Firtst man get 7 -- First loose;
 -> if Second man get 5, the Firtst man get 5 -- First loose;
 -> if Second man get 7, the Firtst man get 3 -- First loose;
So, the Second -- WIN! => Right answer "2"!!!

Edited by author 04.08.2009 16:54

The right answare is "1"

right answer 2

It is not a valid test. Because if first take 7, and second take 7, then nobody can take last 1 stone. Test is valid only if GCD(of all amounts and N) equal to smallest amount.