I won't paste my code yet since my parser just does the needful, and I somehow manage to get overlapping grains of sand, though that doesn't matter in the end.
I'm also seeing a lot of pythonistas having high runtime (1-10s+ and more) and I'm here with the bruteforce grain-by-grain taking 150ms for part 2 (including drawing the final graph lmao). Matlab chads can't stop winning 
EDIT : part 2 webm
Now playing: Welcome to Crocodile Isle (DKC2).mp3
tech/science swag. 
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ogey that's moderately washed
my parser is horrible but works fine
40-50ms for the whole thing
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