I have decided. In the same way that `arr[0]` is the first entry in the array, the "first floor" of a building should mean floor 0 (at ground level) Also floor -1 is the top floor
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This mixed hybrid of the UK and US systems of building floor naming is certain to create no ambiguity or confusion at all
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The C standard explains that it is not undefined behaviour to stand on the roof
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Floors are zero indexed in the UK. "0th" is sometimes pronounced "ground", but most lifts will have a 0.
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