题解

#include<iostream>
#include<cstdio>
int a[10];
using namespace std;
int main(){
    int big=0,small=1010;
    double sum=0.0;
    for(int i=1;i<=4;i++){
        cin>>a[i];
        sum+=a[i];
        if(a[i]>big){
            big=a[i];
        }
        if(a[i]<small){
            small=a[i];
        }
    }
    sum-=big;
    sum-=small;
    printf("%.2f",sum/2);
    return 0;
}