题解

#include <bits/stdc++.h>
using namespace std;
int main()
{
    int sum=0,a,b,c,d,max=0,min=0;
    double jun=0;
	cin>>a>>b>>c>>d;
    if(a>=b&&a>=c&&a>=d)
    {
        max=a;
    }
    else if(b>=a&&b>=c&&b>=d)
    {
        max=b;
    }
    else if(c>=a&&c>=b&&c>=d)
    {
        max=c;
    }
    else if(d>=a&&d>=b&&d>=c)
    {
        max=d;
    }
    
    if(a<=b&&a<=c&&a<=d)
    {
        min=a;
    }
    else if(b<=a&&b<=c&&b<=d)
    {
        min=b;
    }
    else if(c<=a&&c<=b&&c<=d)
    {
        min=c;
    }
    else if(d<=a&&d<=b&&d<=c)
    {
        min=d;
    }
    sum=(a+b+c+d)-(min+max);
    jun=sum/2.0;
    printf("%.02f",jun);
    return 0;
}