You can check big boys here. (They're too big for GitHub).
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Day 5: part 1 uses blatant brute force. Therefore, it takes quite a while to run. Part 2 doesn't, so it runs almost instantly. The latter doesn't work on the bigboy, probably because some edge case I didn't account for. Maybe I'll fix it someday.
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Day 6: none of the parts work on the bigboy because I didn't want to deal with such large numbers.