#include <iostream>
using namespace std;
 
int main() {
    long n, a, b;
    cout << "Cit de mare va fi vectorul? ";
    cin >> n;
 
    long double vector[n];
 
    cout << "Introdu numerele:\n";
    for (int i = 0; i < n; i++) {
        cin >> vector[i];
    }
 
    cout << "De unde pina unde vrei sa afli media? (indexuri a si b): ";
    cin >> a >> b;
    if (a < 0 || b >= n || a > b) {
    cout << "Interval invalid!";
    return 0;
}
 
 
    long double suma = 0;
    long contor = 0;
 
    for (int i = a; i <= b; i++) {
        suma += vector[i];
        contor++;
    }
 
    cout << "Media numerelor este: " << (suma / contor);
 
    return 0;
}
 
 

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