2265. Count Nodes Equal to Average of Subtree

Given the root of a binary tree, return the number of nodes where the value of the node is equal to the average of the values in its subtree. Note: - The average of n elements is the sum of the n elements divided by n and rounded down to the nearest integer. - A subtree of root is a tree consisting of root and all of its descendants. Example 1: Input: root = [4,8,5,0,1,null,6] Output: 5 Exp