Cod sursa(job #2231178)
Utilizator | Data | 13 august 2018 13:08:25 | |
---|---|---|---|
Problema | Sum | Scor | 95 |
Compilator | cpp | Status | done |
Runda | Arhiva de probleme | Marime | 0.55 kb |
#include <iostream>
#include <fstream>
using namespace std;
ifstream f("sum.in");
ofstream g("sum.out");
int Euler[100001];
void precalc(int N)
{
for(int i = 2; i <= N; i++)
Euler[i] = i;
for(int i = 2; i <= N; i++)
if(Euler[i] == i)
for(int j = i; j <= N; j += i)
Euler[j] = Euler[j] / i * (i - 1);
}
int main()
{
int N;
precalc(100000);
f >> N;
while(N--)
{
int x;
f >> x;
g << 2LL * Euler[x] * x << '\n';
}
return 0;
}