Cod sursa(job #2432554)

Utilizator PredescuSebastianIonPredescu Sebastian Ion PredescuSebastianIon Data 24 iunie 2019 12:09:04
Problema Sum Scor 100
Compilator cpp-64 Status done
Runda Arhiva de probleme Marime 0.44 kb
#include <fstream>

using namespace std;
ifstream f("sum.in");
ofstream g("sum.out");
const int maxim=100005;
int n,i,j,a,v[maxim];
int main()
{
    f>>n;
    for(i=1;i<maxim;i++)
    {
        v[i]=i-1;
    }
    for(i=2;i<maxim;i++)
    {
        for(j=2;j<=maxim/i;j++)
        {
            v[i*j]-=v[i];
        }
    }
    for(i=1;i<=n;i++)
    {
        f>>a;
        g<<1LL*v[a]*2*a<<'\n';
    }
    return 0;
}