#include<bits/stdc++.h> using namespace std; int a,b,c; int max(int a,int b,int c){ int s=max(max(a,b),c); return s; } int main(){ cin>>a>>b>>c; double m=1.0 * max(a,b,c) / (max(a+b,b,c) * max(a,b,b+c)); printf("%.3lf",m); return 0; }

#include<bits/stdc++.h> using namespace std; int main(){ int a,b,c; cin>>a>>b>>c; int x=max(max(a,b),c); int y=max(max(a+b,b),c); int z=max(max(a,b),b+c); double m=1.0x/(yz); printf("%.3f",m); return 0; } //抄的是6+1，7+1;

别抄代码！

#include<bits/stdc++.h>
#define int long long
using namespace std;
int a,b,c;
double m(int a,int b,int c){
    return 1.0 * max(a,b,c) / (max(a+b,b,c) * max(a,b,b+c));
}
signed main(){
    ios::sync_with_stdio(0);
    cin.tie(0),cout.tie(0);
    cin>>a>>b>>c;
    cout<<fixed<<setprecision(3)<<m(a,b,c);
    return 0;
}