45 lines
1.1 KiB
Python
45 lines
1.1 KiB
Python
import sys
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# Can handle 10k sand grains in 2s.
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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(" ·●⬤#"[min(4, 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.sandpile1 import main' 'main(10_000, False)'
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...........
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Mean +- std dev: 11.1 sec +- 0.2 sec
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"""
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width = len(terrain)
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did_someting = False
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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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did_someting = True
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return did_someting
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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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while apply_gravity(terrain):
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pass
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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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