题解 | #小乐乐计算函数#

#include<algorithm>
using namespace std;
double max(double a,double b,double c){
    double x[3];
    x[0]=a,x[1]=b,x[2]=c;
    sort(x,x+3);
    return x[2];
}
int main(){
    double a,b,c;
    cin>>a>>b>>c;
     printf("%.2f",max(a+b,b,c)/(max(a,b+c)+max(a,b,b+c)));
    return 0;
}