26 lines
869 B
Python
26 lines
869 B
Python
#!/usr/bin/env python3
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import numpy as np
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from scipy.signal import convolve
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DIMS = 3
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lines = [[(1 if x == '#' else 0) for x in x.strip()] for x in open("input.txt")]
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grid = np.array(lines, dtype=np.byte)
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grid = np.expand_dims(grid, axis=tuple(range(DIMS-2)))
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kernel = np.ones((3, )*DIMS, dtype=np.byte)
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kernel[(1, )*DIMS] = 0
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for _ in range(6):
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grid = np.pad(grid, pad_width=1, mode='constant', constant_values=0)
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neighbors = convolve(grid, kernel, mode='same')
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set_inactive = np.logical_and(grid == 1, np.floor_divide(neighbors, 2) != 1)
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set_active = np.logical_and(grid == 0, neighbors == 3)
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grid[set_inactive] = 0
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grid[set_active] = 1
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for dim in range(DIMS):
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a = np.flatnonzero(grid.sum(axis=tuple(x for x in range(DIMS) if x != dim)))
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grid = grid[(slice(None),)*dim + (slice(min(a), max(a)+1),)]
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print(np.sum(grid))
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