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#include <iostream>
using namespace std;


int main()
{

double a[6];
int n;
cout << "n= ";
cin >> n;
while(n%2!=0)
cin >> n;

if(n<0)
n=-n;
cout << "n= " << n << "\n";



int i;

for(i=0;i<n;i++)
cin >> a[i];




cout << "\n";
for(i=0;i<n;i++)
cout << a[i] << " ";

int sum=0;

for(i=0;i<n/2;i++)
sum=sum+a[i];

cout << "purva polovina= " << sum/(n/2) << "\n";

int sum1=0;
for(i=n/2;i<n;i++)
sum1=sum1+a[i];

cout << "vtora polovina= " << sum1/(n/2) << "\n";


double b[10];
double c[10];
int j=0;


for(i=0;i<n;i++)
if(a[i]<0 && a[i]!=0)
{
b[j]=a[i];
j++;
}

for(i=0;i<j;i++)
cout << b[i];
cout << "\n";

cout << "j= " << j;

cout << "\n";

int k=0;
for(i=0;i<n;i++)
if(a[i]>0 && a[i]!=0)
{
c[k]=a[i];
k++;
}

for(i=0;i<k;i++)
cout << c[i];
cout << "\n";
cout << "k="<< k;

cout << "\n";


double sum3=0;
for(i=0;i<j;i++)
sum3=sum3+1/b[i];
cout << sum3 << "\n";

double sum4=0;
for(i=0;i<k;i++)
sum4=sum4+1/c[i];
cout << sum4 << "\n";






return 0;
}