APL (using Dyalog APL):
⍝ left(⍺):address, right(⍵):n OverTheRoad ← {⍺-⍨1+2×⍵} 1 OverTheRoad 3 6 3 OverTheRoad 3 4 3 OverTheRoad 5 8 7 OverTheRoad 11 16 ⍝ Short, "tacit" form OverTheRoad ← -⍨+1+⊢ ⍝ Arithmetic automatically maps over multiple numbers! 1 3 3 7 OverTheRoad 3 3 5 11 6 4 8 16
(Use the bookmarklet on this post to see the code with APL font and syntax highlighting.)
Explanation: The sum of two houses facing each other is always the same for given n, which is 2n+1. So the opposite house number becomes 2n+1-address.
n
2n+1
2n+1-address
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APL (using Dyalog APL):
(Use the bookmarklet on this post to see the code with APL font and syntax highlighting.)
Explanation: The sum of two houses facing each other is always the same for given
n, which is2n+1. So the opposite house number becomes2n+1-address.