30分求助谢谢，我一定会关注

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

int main()
{
    int n;
    cin >> n;
    double arr[301] = {0};
    double sum1 = 0;
    double av1;
    int m1=-1, m2=-1;
    for (int i = 0; i < n; i++)
    {
        cin >> arr[i];
        sum1 = sum1 + arr[i];

    }

    av1 = sum1 / n;

    double max = 0;
    double min = arr[0];

    for (int i = 0; i < n; i++)
    {

        if (arr[i] > max)
        {
            max = arr[i];
            m1 = i;
        }
    }

    for (int i = 0; i < n; i++)
    {

        if (arr[i] <min)
        {
            min = arr[i];
            m2 = i;
        }
    }

    double cha=0;
    for (int i = 0; i < n; i++)
    {
        if (i!=m1&&i!=m2)
        {

            if (fabs(arr[i] - av1) > cha)
            {
                cha = fabs(arr[i] - av1);
            }

        }
    }

    cout << fixed << setprecision(2) << av1;
    cout << " " << fixed << setprecision(2) << cha << endl;

    return 0;

}