path: root/challenge-068/richard-park/apl/ReorderArray.aplf

 ReorderArray←{
⍝ ←: Major cells of ⍵ reordered
⍝    from a0,a1, ... ,a(n-1),an
⍝    to a0,an,a1,a(n-1),...
     ⍵⌷⍨⊂∪,(⌈2÷⍨≢⍵)↑(⊢,⊖)⍪⍳≢⍵
 }