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: Donkey Kong Country Theme (DJ AG Remix) (DKC).mp3
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Today's problem was fairly easy. I adopted a brute force approach since who cares, I am not gonna die for using ~2MiB of system memory, maybe it's slow but surely it works
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Tbh there is a pretty easy way to optimize it. Instead of dropping it from the source, just save the full path and drop it from the last valid position, saves a lot of time.
If you just want to optimize part 2, just make a wave.
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Yeah you're right. Thankfully the inputs' dimensions are not too high
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Yep. Fortunately in matlab I can easily add columns so I didn't need to hardcode a big playspace, but I've seen some people get fricked because they didn't hardcode it high enough
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Matlabs chads simply cannot stop winning
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