Cod sursa(job #1235475)

Utilizator VladTiberiuMihailescu Vlad Tiberiu VladTiberiu Data 29 septembrie 2014 20:41:02
Problema Sum Scor 70
Compilator cpp Status done
Runda Arhiva de probleme Marime 0.4 kb
#include <fstream>

using namespace std;
ifstream f("sum.in");
ofstream g("sum.out");
int i,phi[100005],j,s,x,n;
int main()
{
    for(i=1 ; i<= 100001 ; ++i)
        phi[i]=i-1;
    for(i=2 ; i<= 100001 ; ++i)
        for(j=i*2 ; j<= 100001 ; j+=i)
        phi[j]-=phi[i];

    f>>n;
    for(i=1;i<=n;i++)
    {
        f >> x;
        g << phi[x]*x*2 << "\n";

    }
    return 0;
}