Cod sursa(job #752099)
Utilizator | Stavarache Petru Eric ericpts | Data | 27 mai 2012 20:01:26 |
---|---|---|---|
Problema | Fractii | Scor | 10 |
Compilator | cpp | Status | done |
Runda | Arhiva de probleme | Marime | 0.55 kb |
#include <iostream>
#include <fstream>
#include <vector>
using namespace std;
int gcd(int a,int b)
{
if(b > a)
return gcd(b,a);
int r = a % b;
while(r)
{
a = b;
b = r;
r = a % b;
}
return b;
}
int main()
{
ifstream in("fractii.in");
ofstream out("fractii.out");
int n,i,j;
unsigned long int p = 0;
in >> n;
for(i=1;i<=n;++i)
for(j=1;j<=n;++j)
if(gcd(i,j) == 1)
++p;
out << p;
return 0;
}