path: root/challenge-130/conor-hoekstra/apl/ch-1.apl

solution ← +/{⍺×2|≢⍵}⌸⍤⊢ 
      
solution 2 5 4 4 5 5 2     ⍝ prints 5 
solution 1 2 3 4 3 2 1 4 4 ⍝ prints 4