LeetCode 315 | Sum of Nodes with Even-Valued Grandparent | Solution Explained (Java + Whiteboard)
Given a binary tree, return the sum of values of nodes with even-valued grandparent. (A grandparent of a node is the parent of its parent, if it exists.)
If there are no nodes with an even-valued grandparent, return 0.
Running Time: O(N)
Space Complexity: O(N)
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