Stripies

#include <iostream>
#include <conio.h>
#include <string>
#include <math.h>
#include <algorithm>
#include <vector>
#include <set>
#include <map>
#include <sstream>
#include <queue>

using namespace std;

int main()
{
    double n, P, prom;
    vector <double> s;
    cin >> n;

    cout.setf(ios::fixed);
    cout.precision(2);
    for (int i = 1; i <= n; i++)
    {
        cin >> prom;
        s.push_back(prom);
    }

    sort(s.begin(), s.end());
    P = s[s.size() - 1];

    for (int i = s.size() - 2; i >= 0; i--)
        P = 2 * sqrt(P*s[i]);

    cout << P;

    _getch();
    return 0;
}