杭电2014

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

int main()
{
    int n;
    double max,min,sum,aver;
    double a[110] = {0};
    while (cin >> n)
    {
        for (int i = 0; i<n; i++)
        {
            cin >> a[i];
        }
        max = min = a[0];
        sum = 0;
        for (int i = 0; i<n; i++)
        {
            if (a[i]<=min)
            {
                min = a[i];
            }
            if (a[i]>=max)
            {
                max = a[i];
            }
            sum += a[i];
        }
        aver = (double)(sum-max-min)/(n-2);
        cout<<setprecision(2)<< setiosflags(ios::fixed)<< aver <<endl;
    }
    return 0;
}