Даны действительные числа a1, a30. получить: а) max(a1+a30, a2+a29, a15+a16); б) min(a1∙a16, a2∙a17, a15∙a30). на с++

#include <stdlib.h>
#include <iostream>
#include <iomanip>
using namespace std;

int main() {
const int n = 30;
double a[n];
double max, min;

srand(time(0));
for (int i = 0; i < n; i++) {
  a[i]=-20 + (51.0 / RAND_MAX) * rand();
  cout << fixed << setw (7) << setprecision (2) << a[i];
}
cout <<"\n";

max = a[0]+a[n-1];
min = a[0]*a[n/2];
for (int i = 1; i<n/2; i++){
 if (a[i]+a[n-i-1] > max) max = a[i]+a[n-i-1]; 
 if (a[i]*a[n/2+i] < min) min = a[i]*a[n/2+i];
}
cout << "max = " << max << "\n";
cout << "min = " << min << "\n";
return 0;
}

Пример (для n=10):
-19.29 30.99 -15.37 26.41 3.65 13.45 29.28 4.28 30.51 -10.36
max = 61.50
min = -259.43