99 Elm Problems/Problem 71
We define the internal path length of a multiway tree as the sum of the path lengths from all nodes of the tree to the root. For example tree5 has an internal path length of 9 (1+2+1+1+2+2). Write a function to calculate internal path length of a tree.
# # # 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))