Function find parent index of tree

find parent index of tree

Format:

find parent index of tree

Input:

list tree -

number child_index -

number index -

Output:

number - None

Properties that reference this function:

find parent index of tree = find parent index of tree (find parent)

find parent index of [ node (x, index, right), rest ] = i (found parent left)

find parent index of [ node (x, left, index), rest ] = i (found parent right)

Conditional properties that reference this function:

if the following are true:
- not (left = val)
- not (right = val)
then find parent index of [ node (el, left, right), remain ] = find parent index of remain
(link)

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