C++ 代码
#include <iostream>
#include <cstring>
#include <algorithm>
#include <cmath>
using namespace std;
int main()
{
int a, b, x, y, s = 0x3f3f3f3f, c;
cin >> a >> b >> x >> y;
c = fabs(b - a);
s = min(c, s);
c = fabs(a - x);
c += fabs(y - b);
s = min(c, s);
c = fabs(a - y);
c += fabs(x - b);
s = min(c, s);
cout << s;
}