Cod sursa(job #96085)
Utilizator | Alexandru Dumitru Paunoiu DranaXum | Data | 31 octombrie 2007 12:49:27 |
---|---|---|---|
Problema | Fractii | Scor | 0 |
Compilator | cpp | Status | done |
Runda | Arhiva de probleme | Marime | 0.46 kb |
#include <fstream.h>
#include <math.h>
int cmmdc(long int a,long int b)
{
long int r;
int x=1;
int i;
if((a%b==0) || (b%a==0)) return 0;
while(x)
{
r=a%b;
a=b;
b=r;
if(r<2) x=0;
}
if(r>1)return 0;else return 1;
}
int main()
{
long int x,n,i,j;
ifstream fin("fractii.in");
ofstream fout("fractii.out");
fin>>n;
fin.close();
x=0;
for(i=1;i<=n/2;i++)
for(j=i+1;j<=n;j++)
x+=2*cmmdc(i,j);
fout<<x;
fout.close();
return 0;
}