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#!/usr/bin/env python3
def neighbours(data: list[list[str]], x: int, y: int) -> int:
acc = 0
for x1, y1 in [
(x - 1, y - 1),
(x - 1, y),
(x - 1, y + 1),
(x, y - 1),
(x, y + 1),
(x + 1, y - 1),
(x + 1, y),
(x + 1, y + 1),
]:
try:
if x1 >= 0 and y1 >= 0 and data[x1][y1] == "#":
acc += 1
except IndexError:
pass
return acc
def simulate(data: list[list[str]]) -> list[list[str]]:
# START PART 1
cond = lambda x, y: (data[x][y] == "#" and neighbours(data, x, y) in [2, 3]) or (
data[x][y] == "." and neighbours(data, x, y) == 3
)
# END PART 1 START PART 2
cond = lambda x, y: (
((x, y) in [(0, 0), (0, 99), (99, 0), (99, 99)])
or (data[x][y] == "#" and neighbours(data, x, y) in [2, 3])
or (data[x][y] == "." and neighbours(data, x, y) == 3)
)
# END PART 2
return [["#" if cond(i, j) else "." for j in range(100)] for i in range(100)]
def main() -> None:
with open("input", "r", encoding="utf-8") as f:
data = [list(l.strip()) for l in f.readlines()]
# START PART 2
data[0][0], data[0][99], data[99][0], data[99][99] = "#", "#", "#", "#"
# END PART 2
for i in range(100):
data = simulate(data)
print(sum(data[i].count("#") for i in range(100)))
if __name__ == "__main__":
main()
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