68 lines
1.5 KiB
Python
68 lines
1.5 KiB
Python
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from helpers import *
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from skimage.morphology import flood
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coords = [tuple(line_to_numbers(line)) for line in read_day(18).split('\n')]
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sample_coords = [tuple(line_to_numbers(line)) for line in '''
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2,2,2
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1,2,2
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3,2,2
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2,1,2
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2,3,2
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2,2,1
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2,2,3
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2,2,4
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2,2,6
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1,2,5
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3,2,5
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2,1,5
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2,3,5
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'''.strip().split('\n')]
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def count_faces(coords: list[tuple[int,int,int]]):
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# print(coords)
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surface_area = 0
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for (x,y,z) in coords:
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if (x+1,y,z) not in coords:
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surface_area += 1
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if (x-1,y,z) not in coords:
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surface_area += 1
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if (x,y+1,z) not in coords:
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surface_area += 1
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if (x,y-1,z) not in coords:
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surface_area += 1
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if (x,y,z+1) not in coords:
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surface_area += 1
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if (x,y,z-1) not in coords:
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surface_area += 1
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return surface_area
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print(f'Part 1 (sample): {count_faces(sample_coords)}')
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print(f'Part 1: {count_faces(coords)}')
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def count_faces_2(coords: list[tuple[int,int,int]]):
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# we pad to ensure the outer edges are fine
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field = np.zeros((25,25,25), dtype=np.int8)
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for (x,y,z) in coords:
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field[x+1,y+1,z+1] = 1
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field[flood(field, (0,0,0), connectivity=1)] = -1
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surface_area = 0
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for (x,y,z) in np.argwhere(field == 1):
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if field[x+1,y,z] == -1:
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surface_area += 1
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if field[x-1,y,z] == -1:
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surface_area += 1
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if field[x,y+1,z] == -1:
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surface_area += 1
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if field[x,y-1,z] == -1:
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surface_area += 1
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if field[x,y,z+1] == -1:
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surface_area += 1
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if field[x,y,z-1] == -1:
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surface_area += 1
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return surface_area
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print(f'Part 2 (sample): {count_faces_2(sample_coords)}')
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print(f'Part 2: {count_faces_2(coords)}')
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