WA..
who can give some test cases?

#include<stdio.h>
#include<stdlib.h>
int main()
{
    long long n,m;
    scanf("%I64d",&n);
    m=n*(n-3)/2;
    if (n % 2==1)
          printf("%I64d 0\n",m);
    if (n % 2==0)
    {
          if (n==4)printf("0 2\n");
          else
              printf("%I64d %I64d\n",m,m);
    }
    system("pause");
    return 0;
}

Edited by author 20.10.2013 09:53

n=4
n=5
n=6

I think that number of perpendicular diagonals for N-polygon is equal to 0 for every odd N. I don't say the same about parallel diagonals in regular N-polygon for odd N.

Edited by author 24.10.2013 19:33

answers for tests:
n = 4
ans: 0 2
n = 5
ans: 0 0
n = 6
ans: 6 9
n = 7
ans: 14 0