zoj 2099 Frame Polygonal Line

//zoj上long必须用%ld来读

#include<stdio.h>

int main(){
	long a[2][2],x,y;
	while(scanf("%ld%ld",&x,&y)&&(x||y)){
		a[0][0] = x;
		a[0][1] = x;
		a[1][0] = y;
		a[1][1] = y;
		while(scanf("%ld%ld",&x,&y)&&(x||y)){
			if(x>a[0][1]) a[0][1] = x;
			if(x<a[0][0]) a[0][0] = x;
			if(y>a[1][1]) a[1][1] = y;
			if(y<a[1][0]) a[1][0] = y;
		}
		printf("%ld %ld %ld %ld\n",a[0][0],a[1][0],a[0][1],a[1][1]);
	}
	return 0;
}