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74 lines
1.7 KiB
74 lines
1.7 KiB
import sys
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from grid import Grid, near8
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def main():
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lines = [line.rstrip() for line in sys.stdin]
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# Part 1
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g = Grid(value_factory=lambda: ".", lines=lines)
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while update(g):
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pass
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print("Occupied:", sum(v == "#" for _, _, v in g.values_gen()))
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# Part 2
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g = Grid(value_factory=lambda: ".", lines=lines)
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while update2(g):
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pass
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print("Occupied part 2:", sum(v == "#" for _, _, v in g.values_gen()))
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def update(g):
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changes = {}
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for x, y, v in g.values_gen():
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if v == ".":
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continue
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p = (x, y)
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n = list(g.near_objects(p, near_f=near8).values())
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if v == "L" and n.count("#") == 0:
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changes[p] = "#"
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elif v == "#" and n.count("#") >= 4:
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changes[p] = "L"
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for (x, y), v in changes.items():
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g.setv(x, y, v)
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return bool(changes)
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RAYS_OFS = [
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(-1, -1), ( 0, -1), ( 1, -1),
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(-1, 0), ( 1, 0),
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(-1, 1), ( 0, 1), ( 1, 1),
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]
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def update2(g):
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changes = {}
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for x, y, v in g.values_gen():
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if v == ".":
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continue
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occ = 0
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for ox, oy in RAYS_OFS:
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n = 1
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while True:
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qx, qy = x + ox * n, y + oy * n
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if not g.hasv(qx, qy):
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break
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if (rv := g.getv(qx, qy)) == "#":
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occ += 1
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break
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elif rv == "L":
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break
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n += 1
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if v == "L" and occ == 0:
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changes[(x, y)] = "#"
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elif v == "#" and occ >= 5:
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changes[(x, y)] = "L"
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for (x, y), v in changes.items():
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g.setv(x, y, v)
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return bool(changes)
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if __name__ == "__main__":
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main()
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