SDUT-OJ4338家里有矿

#include<iostream>
using namespace std;
int main()
{
    int n,x,y;
    cin>>n;
    cin>>x>>y;
    long long int max_x = x,max_y = y,min_x = x,min_y = y;
    for(int i = 2; i <= n; i ++)
    {
        cin>>x>>y;
        if(x>max_x)
        max_x = x;
        else if(x<min_x)
        min_x = x;

        if(y>max_y)
         max_y = y;
        if(y<min_y)
        min_y = y;
    }
    cout << 4 * max(max_x-min_x,max_y-min_y) << endl;
return 0;
}