C++ 代码
#include <iostream>
#include <cstring>
#include <algorithm>
using namespace std;
int main()
{
int a, b, x, y;
cin >> a >> b >> x >> y;
cout << min(abs(a - b), min(abs(a - x) + abs(b - y), abs(a - y) + abs(b - x)));
return 0;
}