54 lines
1.1 KiB
Python
54 lines
1.1 KiB
Python
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# -*- encoding: utf-8 -*-
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import sys
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from typing import FrozenSet
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import numpy as np
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xyz = np.asarray(
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[
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tuple(int(x) for x in row.split(",")) # type: ignore
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for row in sys.stdin.read().splitlines()
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]
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)
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xyz = xyz - xyz.min(axis=0) + 1
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cubes = np.zeros(xyz.max(axis=0) + 3, dtype=bool)
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cubes[xyz[:, 0], xyz[:, 1], xyz[:, 2]] = True
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n_dims = len(cubes.shape)
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faces = [(-1, 0, 0), (1, 0, 0), (0, -1, 0), (0, 1, 0), (0, 0, -1), (0, 0, 1)]
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answer_1 = sum(
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1 for x, y, z in xyz for dx, dy, dz in faces if not cubes[x + dx, y + dy, z + dz]
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)
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print(f"answer 1 is {answer_1}")
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visited = np.zeros_like(cubes, dtype=bool)
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queue = [(0, 0, 0)]
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n_faces = 0
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while queue:
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x, y, z = queue.pop(0)
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if visited[x, y, z]:
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continue
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visited[x, y, z] = True
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for dx, dy, dz in faces:
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nx, ny, nz = x + dx, y + dy, z + dz
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if not all(n >= 0 and n < cubes.shape[i] for i, n in enumerate((nx, ny, nz))):
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continue
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if visited[nx, ny, nz]:
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continue
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if cubes[nx, ny, nz]:
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n_faces += 1
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else:
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queue.append((nx, ny, nz))
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print(f"answer 2 is {n_faces}")
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