Cod sursa(job #2784378)
Utilizator | Cristian Bota Avram CristiBota3 | Data | 16 octombrie 2021 13:07:48 |
---|---|---|---|
Problema | Sum | Scor | 0 |
Compilator | cpp-64 | Status | done |
Runda | Arhiva de probleme | Marime | 0.53 kb |
#include <fstream>
using namespace std;
ifstream fin ("sum.in");
ofstream fout ("sum.out");
int v[100001];
int identitatealuiEuler(int n)
{
for(int i=1; i<=n; i++)
{
v[i]=i-1;
}
v[1]=1;
for(int i=2; i<=n/2; i++)
{
for(int j=2; i*j<=n; j++)
{
v[i*j]-=v[i];
}
}
}
int main()
{
int n,x;
fin>>n;
identitatealuiEuler(100000);
for(int i=1;i<=n;i++)
{
fin>>x;
fout<<v[x]*2*x<<endl;
}
return 0;
}