Cod sursa(job #2532641)
Utilizator | Data | 28 ianuarie 2020 05:23:09 | |
---|---|---|---|
Problema | Sum | Scor | 70 |
Compilator | cpp-64 | Status | done |
Runda | Arhiva de probleme | Marime | 0.59 kb |
#include <iostream>
#include <fstream>
using namespace std;
ifstream f("sum.in");
ofstream g("sum.out");
const int NMAX = 100000;
int v[NMAX + 5];
void Euler(int n)
{
for(int i = 1; i < n; i++)
v[i] = i;
for(int i = 2; i < n; i++)
if(v[i] == i)
for(int j = i; j < n; j += i)
{
v[j] /= i;
v[j] *= i - 1;
}
}
int main()
{
int n;
f >> n;
Euler(NMAX);
int x;
while(n--)
{
f >> x;
g << v[x] * 2 * x << '\n';
}
return 0;
}