from utils import open_day

bg = False
img = dict()
with open_day(20) as f:
    first, rest = f.read().rstrip().split('\n\n')
    alg = [c == '#' for c in first]
    for y, line in enumerate(rest.split('\n')):
        for x, c in enumerate(line):
            img[(x, y)] = c == '#'

def bits_at(img, x, y):
    bits = []
    for dx, dy in ((-1, -1), (0, -1), (1, -1), (-1, 0), (0, 0), (1, 0), (-1, 1), (0, 1), (1, 1)):
        bits.append(img.get((x + dx, y + dy), bg))
    val = int(''.join('1' if b else '0' for b in bits), 2)
    return val

def iter():
    global bg, img
    new = dict()
    minx, maxx = float('inf'), float('-inf')
    miny, maxy = float('inf'), float('-inf')
    for p, v in img.items():
        if not v: continue
        x, y = p
        minx, maxx = min(minx, x), max(maxx, x)
        miny, maxy = min(miny, y), max(maxy, y)
    for y in range(miny - 1, maxy + 2):
        for x in range(minx - 1, maxx + 2):
            new[(x, y)] = alg[bits_at(img, x, y)]
    img = new
    bg = not bg

iter()
iter()

print(sum(img.values()))

for _ in range(48): iter()

print(sum(img.values()))