C++ :

#include<iostream>
#include<algorithm>
using namespace std;
int n,a[10008];
int main()
{
	cin>>n;
	for (int i=1;i<=n;i++)
	cin>>a[i];
	for (int i=1;i<=n/2;i++)
	cout<<a[i]+a[i+n/2]<<" ";
	return 0;
}