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- def move(pt):
- x, y, z = pt
- for dx in [1, 0, -1]:
- for dy in [1, 0, -1]:
- for dz in [1, 0, -1]:
- if abs(dx) + abs(dy) + abs(dz) == 1:
- yield x + dx, y + dy, z + dz
-
-
- def is_outside(pt, outside=set(), inside=set(), max_bubble_size=2000):
- edge = {pt}
- seen = set()
- while True:
- edge = {adj_pt for pt in edge for adj_pt in move(pt)} - seen - cubes
- seen |= edge
- if seen & outside or len(seen) > max_bubble_size:
- outside |= seen
- return True
- if seen & inside or not edge:
- inside |= seen
- return False
-
-
- def solve(is_outside=lambda *args: True):
- surface = 0
- for pt in cubes:
- for adj_pt in move(pt):
- if adj_pt not in cubes and is_outside(adj_pt):
- surface += 1
- return surface
-
-
- text = open(0).read()
- cubes = {tuple(map(int, ln.split(','))) for ln in text.splitlines()}
- print(solve())
- print(solve(is_outside))
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