Cod sursa(job #129808)
Utilizator | hulparu adrian hulparuadrian | Data | 30 ianuarie 2008 11:45:46 |
---|---|---|---|
Problema | Fractii | Scor | 10 |
Compilator | cpp | Status | done |
Runda | Arhiva de probleme | Marime | 0.48 kb |
#include<iostream.h>
#include<fstream.h>
ifstream(f);
ofstream(g);
int cmmdc(int a,int b)
{while(0==0)
{
int r=a%b;
if (r==0) break;
a=b;
b=r;
}
return b;
}
int main()
{
f.open("fractii.in");
g.open("fractii.out");
long int n;
long long int s;
f>>n;
s=2*n-1;
for(int i=2;i<=n;i++)
{for(int j=2;j<=n;j++)
{
if (i!=j&&(i%j!=0||j%i!=0))
if(cmmdc(i,j)==1) s++;}
}
g<<s;
f.close();
g.close();
return 0;
}