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Cod sursa(job #819297)
#include<fstream>
#include<math.h>
using namespace std;
int ind_euler(int x)
{
int rasp=x,d,e,nr=x;
int lim=sqrt((double)x);
d=2;
while(nr>1&&d<=lim)
{
e=0;
while(nr%d==0)
{
e++;
nr/=d;
}
if(e>0)
{
rasp=rasp/d*(d-1);
lim=sqrt((double)nr);
}
d++;
}
if(nr>1)
rasp=rasp/nr*(nr-1);
return rasp;
}
int main()
{
long long n,x,i,j;
long long rasp;
ifstream f("sum.in");
ofstream g("sum.out");
f>>n;
for(i=1;i<=n;i++)
{
f>>x;
j=ind_euler(x);
rasp=2*j*x;
if(i<n)
g<<rasp<<'\n';
else
g<<rasp;
}
}