40 lines
963 B
Python
40 lines
963 B
Python
from output import answer
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n = 9
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title = "Mirage Maintenance"
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@answer(1, "OASIS report extrapolated values sum is {}")
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def part_1(data):
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lines = [[int(d) for d in line.split()] for line in data.splitlines()]
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return _solve(lines)
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@answer(2, "Using prepending, OASIS report extrapolated values sum is {}")
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def part_2(data):
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lines = [[int(d) for d in line.split()[::-1]] for line in data.splitlines()]
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return _solve(lines)
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def _solve(lines):
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vs = 0
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for l in lines:
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h = [l]
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while any(n != 0 for n in h[-1]):
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h.append([b - a for a, b in zip(h[-1], h[-1][1:])])
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h = h[::-1]
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for i in range(len(h)):
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h[i].append(0 if i == 0 else h[i - 1][-1] + h[i][-1])
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vs += h[-1][-1]
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return vs
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if __name__ == "__main__":
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with open(f"./input/09.txt", "r") as f:
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inp = f.read().strip()
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a = part_1(inp)
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b = part_2(inp)
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assert a == 1702218515
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assert b == 925
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