Giới thiệu
include <iostream>
using namespace std;
int main()
{
int i;
cin >> i;
long p[i], q[i];
for (int j = 0; j < i; j++)
{
cin >> p[j];
}
for (int j = 0; j < i; j++)
{
if (p[j] < 4 || p[j] % 2 == 1)
{
cout << "-1"<<endl;
break;
}
if(p[j]%4==0)
cout<<p[j]*p[j]/16<<endl;
else cout<<(p[j]/4)*(p[j]/4+1)<<endl;
}
return 0;
}