66 lines
1.6 KiB
Python
66 lines
1.6 KiB
Python
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import sys
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from grid import Grid
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def main():
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lines = [line.rstrip() for line in sys.stdin]
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g = Grid(value_factory=int)
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# Part 1
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for line in lines:
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x, y = 0, 0
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while line:
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if line[0] in ("e", "w"):
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x, y = move(x, y, line[0])
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line = line[1:]
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else:
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x, y = move(x, y, line[:2])
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line = line[2:]
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g.setv(x, y, abs(g.getv(x, y) - 1))
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print("Black tiles:", sum(v for _, _, v in g.values_gen()))
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# Part 2 aka stop using this grid class it's horrible
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for _ in range(100):
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expand(g)
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yagol(g)
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print("Black tiles p2:", sum(v for _, _, v in g.values_gen()))
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def move(x, y, d):
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if d in ("e", "w"):
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x += 1 if d == "e" else -1
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else:
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dy, dx = d[0], d[1]
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if y % 2 == 0 and dx == "w":
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x -= 1
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elif y % 2 == 1 and dx == "e":
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x += 1
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y += 1 if dy == "s" else -1
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return x, y
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D = ["e", "se", "sw", "w", "nw", "ne"]
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def expand(g):
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for x, y, _ in list(g.values_gen()):
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for d in D:
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dx, dy = move(x, y, d)
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if not g.hasv(dx, dy):
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g.setv(dx, dy, 0)
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def yagol(g):
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c = {}
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for x, y, v in g.values_gen():
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bn = 0
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for d in D:
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nx, ny = move(x, y, d)
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if g.hasv(nx, ny):
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bn += g.getv(nx, ny)
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if v == 1 and (bn == 0 or bn > 2):
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c[(x, y)] = 0
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elif v == 0 and bn == 2:
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c[(x, y)] = 1
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for (x, y), v in c.items():
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g.setv(x, y, v)
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if __name__ == "__main__":
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main()
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