Cod sursa(job #1118756)

Utilizator GeorgianBaditaBadita Marin-Georgian GeorgianBadita Data 24 februarie 2014 13:05:32
Problema Fractii Scor 100
Compilator cpp Status done
Runda Arhiva de probleme Marime 0.34 kb
Raporteaza aceasta sursa 
#include<fstream>
using namespace std;
ifstream f("fractii.in");
ofstream g("fractii.out");
int main()
{
    int n,i,j;
    long long suma=0;
    f>>n;
    int v[n];
    for( i=1;i<=n;i++) v[i]=i-1;
    for( i=2;i<=n;i++)
    {
        for(j=i*2;j<=n;j+=i)
        v[j]=v[j]-v[i];
         suma+=v[i];
    }
    g<<2*suma+1;
}