杭电acm1859

http://acm.hdu.edu.cn/showproblem.php?pid=1859

只要挑出各个坐标最大的就可以了

#include<stdio.h>
int main()
{
    int m,n,x1,y1,x2,y2;
    while(scanf("%ld %ld",&m,&n)&&(m||n))
    {
        x1=x2=m;
        y1=y2=n;
        while(scanf("%ld %ld",&m,&n)&&(m||n))
        {
            if(x1<m) x1=m;
            if(y1<n) y1=n;
            if(y2>n) y2=n;
            if(x2>m) x2=m;
        }
        printf("%d %d %d %d\n",x2,y2,x1,y1);
    }
      return 0;
}