Cod sursa(job #2592495)

Utilizator darkeagleDaniel Popescu darkeagle Data 1 aprilie 2020 19:05:06
Problema Sum Scor 100
Compilator cpp-64 Status done
Runda Arhiva de probleme Marime 0.48 kb
 #include <fstream>
#define nmax 100005
using namespace std;
ifstream fin("sum.in");
ofstream fout("sum.out");


long long phi[nmax];
void Euler() {
long  long i,j;
for(i=1;i<nmax;i++)
    phi[i]=i;
for(i=1;i<nmax;i++)
        for(j = 2*i;j <= nmax;j+=i)
            phi[j] -= phi[i];
}
int main() {
long long  n, x;
long long t, i;
Euler();
fin >> n;
for (i = 1; i <= n;i++) {
    fin >> x;
    t = 2*x * phi[x];
    fout << t << "\n";
}


return 0;
}