//examples 3 1 5 0 2 4 6 prints as ...3 .1...5 0.2.4.6 1 0 5 4 3 2 prints as .1 0....5 ....4 ...3 ..2Only x collides. It does not when x for node is node's in-order traversal number. To show tree in 1st quad, offset y by depth.

(n): // box x or pass by ref (n, x = {x=0}, y = depth(n)-1) (n, x, y): if n == null: return (n.left, x, y-1) print(x.x, y) x.x++ (n.right, x, y-1)

[Hat tip to J]

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