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Shoudn't that be opposite? I mean European floor number should be one or two HIGHTER that American? F.e. US 5th floor is EU 6th not 4th.
I guess it should be mentioned in the task description that for JS the output expected as an array. I tried a lot of options to return my result as (num1, num2) (including string format), but did not succeed in spite of the numbers itselves were correct.
I just occasionally understood that I had been expected to return array only by wild guess... Seems to be an issue of the task description, isn't that?
The format of your output should be an array (for you code above [i, e]). I understood this only by getting the wild guess. I think this is an issue of the description of the task.