hdu 1859 最小长方形

#include <iostream>
#include <cmath>
#include <cstdio>
using namespace std;

int main()
{
    int x,y;
    while(cin>>x>>y)
    {
        if(x==0&&y==0) break;
        int x1,y1,x2,y2;
        x1=x;y1=y;
        x2=x;y2=y;
        while(cin>>x>>y)
        {
            if(x==0&&y==0) break;
            if(x<=x1)
            x1=x;
            if(y<=y1)
            y1=y;
            if(x>=x2)
            x2=x;
            if(y>=y2)
            y2=y;
        }
        cout<<x1<<" "<<y1<<" "<<x2<<" "<<y2<<endl;
    }
    return 0;
}