challenge-263/asherbhs/apl/ch-2.apl


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MergeItems←{,∘(+/)⌸/↓⍉⍺⍪⍵}

⎕←(↑(1 1) (2 1) (3 2))       MergeItems ↑(2 2) (1 3)
⎕←(↑(1 2) (2 3) (1 3) (3 2)) MergeItems ↑(3 1) (1 3)
⎕←(↑(1 1) (2 2) (3 3))       MergeItems ↑(2 3) (2 4)