Cod sursa(job #3155475)
Utilizator | Stefan Chiper stefanchp | Data | 8 octombrie 2023 14:42:46 |
---|---|---|---|
Problema | Sum | Scor | 70 |
Compilator | cpp-64 | Status | done |
Runda | Arhiva de probleme | Marime | 0.44 kb |
#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("sum.in");
ofstream fout("sum.out");
int n, x;
int phi[100001];
int main()
{
phi[1] = 1;
for (int i = 2; i <= 100000; i++)
phi[i] = i - 1;
for (int i = 2; i <= 100000; i++)
for (int j = 2 * i; j <= 100000; j += i)
phi[j] -= phi[i];
fin >> n;
for (int i = 1; i <= n; i++)
{
fin >> x;
fout << 2 * x * phi[x] << '\n';
}
return 0;
}