45 lines
1.2 KiB
Python
45 lines
1.2 KiB
Python
import sys
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def should_apply_gravity(terrain):
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width = len(terrain)
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return any(terrain[x][y] >= 4 for x in range(width) for y in range(width))
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def show_terrain(terrain):
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width = len(terrain)
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for x in range(width):
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for y in range(width):
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print(" ·●⬤"[terrain[x][y]], end="")
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print()
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def apply_gravity(terrain):
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"""
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$ python -m pyperf timeit --fast -s 'from examples.sandpile import main' 'main(10_000, False)'
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...........
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Mean +- std dev: 15.4 sec +- 0.4 sec
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"""
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width = len(terrain)
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while should_apply_gravity(terrain):
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for x in range(width):
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for y in range(width):
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if terrain[x][y] >= 4:
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terrain[x][y] -= 4
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terrain[x - 1][y] += 1
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terrain[x + 1][y] += 1
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terrain[x][y + 1] += 1
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terrain[x][y - 1] += 1
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def main(height, show=True):
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width = int(height ** .5) + 1
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terrain = [[0] * width for _ in range(width)]
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terrain[width // 2][width // 2] = height
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apply_gravity(terrain)
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if show:
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show_terrain(terrain)
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if __name__ == "__main__":
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main(int(sys.argv[1]))
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