C++ Одномерные массивы

 #include  
#include  
 
using namespace std; 
 
double sum_of_positives(vector &v){ 
    double s = 0; 
    for(auto &i: v) s += i * (i > 0); 
    return s; 
} 
 
double prod(vector &v, int l, int r){ 
    if(l > r) swap(l, r); 
    if(l + 1 >= r) 
        return 0; 
    double p = v[l]; 
    for(int i = l + 1; i <= r; i++) 
        p *= v[i]; 
    return p; 
} 
 
int main() { 
    int n; 
    cin >> n; 
    vector a(n); 
    for (auto &i: a) cin >> i; 
    pair abs_min = {abs(a[0]), 0}, abs_max = {abs(a[0]), 0}; 
    for (int i = 1; i < n; i++) { 
        if (a[i] < abs_min.first) abs_min = {a[i], i}; 
        if (a[i] > abs_max.first) abs_max = {a[i], i}; 
    } 
    cout << "Sum: " << sum_of_positives(a) << "\n" 
         << "Product between abs_min and abs_max: " << prod(a, abs_min.second, abs_max.second); 
}