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34 lines
921 B
34 lines
921 B
from PIL import Image
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WIDTH = 25
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HEIGHT = 6
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NUM_PIXELS = WIDTH * HEIGHT
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def main():
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with open("day8.txt", "rt") as input_file:
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data = input_file.readlines()[0].rstrip()
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num_layers = len(data) // NUM_PIXELS
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layers = [data[i * NUM_PIXELS : (i+1) * NUM_PIXELS] for i in range(num_layers)]
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# Part 1
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least_zeros_layer = min(layers, key=lambda layer: sum(d == "0" for d in layer))
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num_ones = sum(d == "1" for d in least_zeros_layer)
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num_twos = sum(d == "2" for d in least_zeros_layer)
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print("Result:", num_ones * num_twos)
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# Part 2
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img = Image.new("1", (WIDTH, HEIGHT))
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for layer in reversed(layers):
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for index, pixel in enumerate(layer):
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if pixel == "2":
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continue
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coords = (index % WIDTH, index // WIDTH)
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img.putpixel(coords, int(pixel))
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img.save("/tmp/day8.png")
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if __name__ == "__main__":
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main()
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