57 lines
1.1 KiB
Python
57 lines
1.1 KiB
Python
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from output import answer
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n = 13
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title = "Point of Incidence"
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@answer(1, "Summarizing the notes gives {}")
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def part_1(presolved):
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return presolved[0]
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@answer(2, "Summarizing the notes allowing off-by-1 gives {}")
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def part_2(presolved):
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return presolved[1]
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def presolve(data):
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g = [l.split() for l in data.split("\n\n")]
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p1 = sum(d * n for d, n in _inspect(g))
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p2 = sum(d * n for d, n in _inspect(g, 1))
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return p1, p2
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def _inspect(g, a=0):
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af = []
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for m in g:
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for d, n in [(100, m), (1, tuple(zip(*m)))]:
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af.append((d, _compare(n, a)))
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return af
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def _compare(l, a=0):
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for i in range(1, len(l)):
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if (
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sum(
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sum(a != b for a, b in zip(x, y)) for x, y in zip(l[i - 1 :: -1], l[i:])
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)
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== a
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):
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return i
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return 0
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if __name__ == "__main__":
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with open("./input/13.txt", "r") as f:
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inp = f.read().strip()
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inp = presolve(inp)
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a = part_1(inp)
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b = part_2(inp)
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assert a == 29213
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assert b == 37453
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