Cod sursa(job #2282829)
Utilizator | Stoicescu Adrian Nicolae HD650 | Data | 14 noiembrie 2018 15:56:23 |
---|---|---|---|
Problema | Sum | Scor | 100 |
Compilator | cpp-64 | 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 x;
int Euler[100001];
void calc(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()
{
calc(100000);
int n;
f>>n;
while(n--)
{
f>>x;
g << 2LL * Euler[x] * x << '\n';
}
return 0;
}
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