#include<iostream>
#include<cmath>
using namespace std;
int main(){
int a,b,c,d,l,m,h,z,e,D,X,C;
cin >> a >> b >> c >> d;
l = max(max(max(a,b),c),d);
m = min(min(min(a,b),c),d);
h = l + m;
z = a + b + c + d;
e = z - h;
D = max(h,e);
X = min(h,e);
C = D - X;
cout << C;
return 0;
}
很复杂的一种办法
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