Cod sursa(job #2695819)
Utilizator | 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;
}