Most Frequent Subtree Sum Given the root
of a binary tree, return the most frequent subtree sum. If there is a tie, return all the values with the highest frequency in any order.
The subtree sum of a node is defined as the sum of all the node values formed by the subtree rooted at that node (including the node itself).
Example 1:


Input: root = [5,2,-3] Output: [2,-3,4]
Example 2:


Input: root = [5,2,-5] Output: [2]
Constraints:
- The number of nodes in the tree is in the range
[1, 104]
. -105 <= Node.val <= 105
Most Frequent Subtree Sum Solutions
✅Time: O(n)
✅Space: O(n)
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