#include<iostream> #include<cmath> using namespace std; int main(){ int x1,y1,x2,y2,x,y; cin>>x1>>y1>>x2>>y2; x = abs(x1-x2);//绝对值abs(计算的数据)绝对值为正数 y = abs(y1-y2); if(x > y){ cout<<x<<endl; } else{ cout<<y<<endl; } return 0; }