Cod sursa(job #2577774)
Utilizator | Data | 9 martie 2020 20:31:49 | |
---|---|---|---|
Problema | Sum | Scor | 70 |
Compilator | cpp-64 | Status | done |
Runda | Arhiva de probleme | Marime | 0.48 kb |
#include <fstream>
#define N 100001
using namespace std;
ifstream fin("sum.in");
ofstream fout("sum.out");
///INDICATORUL LUI EULER
int v[N];
void Euler()
{
for(int i=1; i<=N; i++)
v[i] = i;
for(int i=1; i<=N; i++)
for(int j=2*i; j<=N; j+=i)
v[j] -= v[i];
}
int main()
{
int x, n;
Euler();
fin >> n;
for(int i=1; i<=n; i++)
{
fin >> x;
fout << 2*x*v[x] << "\n";
}
return 0;
}