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haakonvt/aoc2023_day9.py

Created December 9, 2023 11:12
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AOC 2023, day 9
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aoc2023_day9.py
def diff_inplace(arr):
for idx in range(arr.shape[1], 2, -1):
arr[:,:idx-1] = np.diff(arr[:,:idx])
return arr.sum()
p1 = np.array([l.split() for l in inp.splitlines()], dtype=np.int32)
p2 = np.fliplr(p1.copy())
print(diff_inplace(p1), diff_inplace(p2))
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