Cod sursa(job #1194694)

Utilizator gbibBacotiu Gabi gbib Data 4 iunie 2014 17:20:07
Problema Sum Scor 80
Compilator cpp Status done
Runda Arhiva de probleme Marime 0.34 kb
Raporteaza aceasta sursa 
#include <fstream>
using namespace std;
ifstream in("sum.in");
ofstream out("sum.out");
int phi[100005];
int main()
{int n,i,j,t,x;
for(i=2;i<=100005;++i)
    phi[i]=i-1;
for(i=2;i<=100005;++i)
    for(j=2*i;j<=50005;j+=i)
        phi[j]-=phi[i];
in>>t;
while(t--)
{
    in>>x;
    out<<2LL*phi[x]*x<<'\n';
}
    return 0;
}