poj1862

简单题

View Code

#include <iostream>

#include <cstdlib>

#include <cstdio>

#include <cstring>

#include <algorithm>

#include <cmath>

using namespace std;



#define maxn 105



int n;

int f[maxn];



int main()

{

    //freopen("t.txt", "r", stdin);

    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("%.3f\n", ans);

}