求距离比大小
#include <iostream>
using namespace std;
int main (){
int a,b,x,y;
cin >> a >> b >> x >> y;
if(a > b){
a = a ^ b;
b = a ^ b;
a = a ^ b;
}
if(x > y) {
x = x ^ y;
y = x ^ y;
x = x ^ y;
}
int len1,len2;
len1 = b-a;
len2 = abs(x-a) + abs(y-b);
cout << min(len1,len2);
return 0;
}