2nd task Arduino

#include <iostream>
#include <cmath>
#include <iomanip>
#include <vector>
using namespace std;

int main() {
    int n;
    long long int sum_RR = 0;
    long double mean_RR = 0, std_RR = 0, q = 0;

    cin >> n;
    vector <long long int> time_RR (n);

    int min_RR = 0;
    int max_RR = 0;

    for (int i = 0; i<n; i++) {
        cin >> time_RR[i];
        if (time_RR[i] > time_RR[max_RR]) max_RR = i;
        if (time_RR[i] < time_RR[min_RR]) min_RR = i;
        mean_RR += time_RR[i];
    }

    mean_RR /= (long double) n;

    for (int i = 0; i<n; i++) q += (time_RR[i] - mean_RR) * (time_RR[i] - mean_RR);

    std_RR = sqrtl(q / (long double) n);

    cout << fixed;
    cout << setprecision(2);
    cout << mean_RR << " " << time_RR[min_RR] << " " << time_RR[max_RR] << " " << std_RR;

    return 0;
}