Cod sursa(job #2695819)

Utilizator VDAVIDVladuca david VDAVID Data 14 ianuarie 2021 17:02:44
Problema Sum Scor 100
Compilator cpp-64 Status done
Runda Arhiva de probleme Marime 0.48 kb
#include <fstream>
using namespace std;
ifstream fin("sum.in");
ofstream fout("sum.out");
const int NMAX=200005;
long long v[NMAX];
int main()
{   int i,n,x,j;
    for(i=1;i<= 100000;i++)
        v[i]=i;
    for(i=2;i<=100000;i++)
    {
        if(v[i]==i)
        {
            for(j=i;j<=100000;j+=i)
                v[j]=v[j]/i*(i-1);
        }
    }
    fin>>n;
    for (i=1;i<=n;i++)
    {
        fin>>x;
        fout<<2*x*v[x]<<'\n';
    }
    return 0;
}