Day 4: Printing Department

#include <stdio.h>

#define GZ 144

static char g[GZ][GZ];

int
main()
{
	int p1=0,p2=0, nc=0, x,y;

	for (y=1; fgets(g[y]+1, GZ-2, stdin); y++)
		;

	for (y=1; y<GZ-1; y++)
	for (x=1; x<GZ-1; x++)
		p1 += g[y][x] == '@' &&
		      (g[y-1][x-1] == '@') +
		      (g[y-1][x  ] == '@') +
		      (g[y-1][x+1] == '@') +
		      (g[y  ][x-1] == '@') +
		      (g[y  ][x+1] == '@') +
		      (g[y+1][x-1] == '@') +
		      (g[y+1][x  ] == '@') +
		      (g[y+1][x+1] == '@') < 4;

	do {
		nc = 0;

		for (y=1; y<GZ-1; y++)
		for (x=1; x<GZ-1; x++)
			if (g[y][x] == '@' &&
			    (g[y-1][x-1] == '@') +
			    (g[y-1][x  ] == '@') +
			    (g[y-1][x+1] == '@') +
			    (g[y  ][x-1] == '@') +
			    (g[y  ][x+1] == '@') +
			    (g[y+1][x-1] == '@') +
			    (g[y+1][x  ] == '@') +
			    (g[y+1][x+1] == '@') < 4) {
				nc++;
				p2++;
				g[y][x] = '.';
			}
	} while (nc);

	printf("04: %d %d\n", p1, p2);
	return 0;
}