Cod sursa(job #2083373)

Utilizator GVolterMatamare GVolter Data 7 decembrie 2017 17:15:35
Problema Sum Scor 0
Compilator cpp Status done
Runda Arhiva de probleme Marime 0.52 kb
#include <fstream>

using namespace std;

int phi[100001];

int main()
{
    ifstream in("sum.in");
    ofstream out("sum.out");
    int n,x,y;
    for(int i=1;i<=100000;i++)
        phi[i]=i;
    for(int i=2;i<=100000;i++)
        if(phi[i]==i)
            for(int j=1;j<=100000;j+=i)
            {
                phi[j]/=i;
                phi[j]*=(i-1);
            }
    in>>n;
    for(int i=1;i<=n;i++)
    {
        in>>x;
        y=1LL*2*phi[x]*x;
        out<<y<<'\n';
    }

    return 0;
}