I can say that Bring_Back_Shantz, GGG, and SebC all have correct solutions, though not all are identical. I think it's interesting that SebC worked backwards for their solution, and so has basically the reverse solution of the other two.
Based on timestamps, BBS answered first. Great job!
I do enjoy reading your musings/reasonings for your solutions. Extra points to BBS and GGG for coming up with the general formula to solve this for a building with n floors.
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