Cod sursa(job #861626)

Utilizator alexsuciuAlex Suciu alexsuciu Data 21 ianuarie 2013 19:55:20
Problema Sum Scor 40
Compilator cpp Status done
Runda Arhiva de probleme Marime 0.4 kb
#include<iostream>
#include<fstream>
using namespace std;
long i,j,n,v[100001],x;
int main()
{
    ifstream f("sum.in");
    ofstream g("sum.out");
    f>>n;
    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);
    for(i=1;i<=n;i++)
    {
        f>>x;
        g<<v[x]*2*x<<endl;
    }
}