How should I practice Average Values by Binary-Tree Level?

Start by reading the full statement, solve the visible examples, then compare the pattern against related Motive phone screen problems in FastPrep.

Is Average Values by Binary-Tree Level associated with Motive?

FastPrep tags this as a Motive phone screen coding practice problem when the problem catalog has that company and stage context.

Motive● MediumFULLTIMEPHONE SCREEN

Given the root of a non-empty binary tree, return an array whose value at index d is the arithmetic mean of all node values at depth d.

The root is at depth zero. Return averages from the root level down to the deepest level.

averageOfLevels(root: TreeNode) → double[]

root = [3,9,20,null,null,15,7]return = [3.0,14.5,11.0]

The three levels are [3], [9,20], and [15,7].

root = [5]return = [5.0]

A one-node tree has one level.