Cod sursa(job #1376182)

Utilizator dragos99Homner Dragos dragos99 Data 5 martie 2015 16:27:06
Problema Fractii Scor 100
Compilator cpp Status done
Runda Arhiva de probleme Marime 0.3 kb
Raporteaza aceasta sursa 
#include<fstream>
using namespace std;
long n,i,v[1000001],j;
long long s;
int main()
{
    ifstream f("fractii.in");
    ofstream g("fractii.out");
f>>n;
for(i=1;i<=n;i++)
    v[i]=i-1;
for(i=1;i<=n;i++)
    {for(j=2*i;j<=n;j=j+i)
        v[j]=v[j]-v[i];
    s=s+v[i];}
g<<2*s+1;
return 0;
}