RT，在点1、5WA

#include<iostream>
#include<cstdio>
#include<cstring>
#include<cmath>
using namespace std;

int main(){
    int n,m;
    cin>>n>>m;
    m-=2;
    double min,sum,tmp;
    double max,summax=0.0;

    for(int i=1;i<=n;i++){
        sum=0;
        cin>>max;
        cin>>min;
        sum+=(max+min);
        for(int j=1;j<=m;j++){
            cin>>tmp;
            sum+=tmp;
            if(max<tmp)
                max=tmp;
            if(min>tmp)
                min=tmp;
        }
        sum-=(max+min);
        if(summax<sum/m){
            summax=sum/m;
        }
    }
    printf("%.2f",summax);

	return 0;
}