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path: root/17_2020.py
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import fileinput
import re
import itertools


def solve(p1):
    ON = set()
    L = list([l.strip() for l in fileinput.input()])
    for r, l in enumerate(L):
        for c, ch in enumerate(l):
            if ch == "#":
                ON.add((r, c, 0, 0))

    for _ in range(6):
        NEW_ON = set()
        CHECK = set()
        for x, y, z, w in ON:
            for dx, dy, dz, dw in itertools.product([-1, 0, 1], repeat=4):
                if w + dw == 0 or (not p1):
                    CHECK.add((x + dx, y + dy, z + dz, w + dw))

        for x, y, z, w in CHECK:
            nbr = 0
            for dx, dy, dz, dw in itertools.product([-1, 0, 1], repeat=4):
                if dx != 0 or dy != 0 or dz != 0 or dw != 0:
                    if (x + dx, y + dy, z + dz, w + dw) in ON:
                        nbr += 1
            if (x, y, z, w) not in ON and nbr == 3:
                NEW_ON.add((x, y, z, w))
            if (x, y, z, w) in ON and nbr in [2, 3]:
                NEW_ON.add((x, y, z, w))
        ON = NEW_ON

    return len(ON)


print(solve(True))
print(solve(False))