题解

#include<iostream>
using namespace std;

int main()
{
    int max=0,min=999999,a[4];
    for(int i=0; i<4; i++)
    {
        cin >> a[i];
        if(a[i] > max)
            max = a[i];
        if(a[i] < min)
            min = a[i];
    }
    double sum = a[0] + a[1] + a[2] + a[3] - max - min;
    scanf("%lf",&sum);
    printf("%.2lf",sum/2);
}