1 2 3 4 5
MaxPositiveNegative←{⌈/+/1 ¯1∘.=×⍵} ⎕←MaxPositiveNegative ¯3 1 2 ¯1 3 ¯2 4 ⎕←MaxPositiveNegative ¯1 ¯2 ¯3 1 ⎕←MaxPositiveNegative 1 2