LeetCode 508: Most Frequent Subtree Sum
Problem Restatement We are given the root of a binary tree. For every node, define its subtree sum as the sum of all values in the subtree rooted at that node. This includes the node itself and all of its descendants. We need to return the subtree sum value or values that appear most frequently. If several subtree sums have the same highest frequency, return all of them in any...