Leetcode Problem 508. Most Frequent Subtree Sum

508. Most Frequent Subtree Sum

Leetcode Solutions

Define a helper function calculateSubtreeSum that performs a post-order traversal and calculates the subtree sum for each node.
In the helper function, if the current node is null, return 0.
Recursively call calculateSubtreeSum for the left and right children of the current node.
Calculate the current subtree sum by adding the current node's value to the sum of its left and right subtrees.
Update the frequency of the current subtree sum in the hashmap.
Update the maximum frequency if the current subtree sum's frequency is greater than the maximum frequency.
After the traversal, iterate over the hashmap to collect all keys (subtree sums) that have the maximum frequency.
Return the collected subtree sums.

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