As a preparation for drawing the tree, a layout algorithm is required to determine the position of each node in a rectangular grid. In this layout strategy, the position of a node v is obtained by the following two rules:

# # # THIS IS A STUB # # #

Example in Elm:

import Html exposing (text)
import List

f : Int -> Int
-- your implementation goes here

main = text (toString (f 0))

Result:

4

Solutions