poj 1862 Stripies

#include <iostream>#include <cstdlib>#include <cstdio>#include <cstring>#include <algorithm>#include <cmath>using namespace std;#define maxn 105int n;int f[maxn];int main(){    scanf("%d", &n);    for (int i = 0; i < n; i++)        scanf("%d", &f[i]);    sort(f, f + n);    double ans = f[n - 1];    for (int i = n - 2; i >= 0; i--)        ans = 2 * sqrt(ans * f[i]);    printf("%.3fn", ans);}