代码如下，样例过了，不知道错哪儿orz

#include <bits/stdc++.h>
using namespace std;

int n, m;
double average[20];
double a[100];

int main() {
    cin >> n >> m;
    for (int i = 0; i <= n-1; i++) {
        double s = 0;
        for (int x = 0; x <= m-1; x++) {
            cin >> a[x];
        }
        sort(a, a + m);
        for (int k = 1; k <= m-2; k++) {
            s = s + a[k];
        }
        average[i] = s / (m-2);
    }
    sort(average, average+n);
    printf("%.2lf", average[n-1]);
    return 0;
}