Sum of Nodes with Even-Valued Grandparent
Medium
Topics
Given the root of a binary tree, return the sum of values of every node whose grandparent has an even value. If there are no such nodes, return 0.
Example 1
Input: root = [6,7,8,2,7,1,3,9,null,1,4,null,null,null,5] Output: 18
Example 2
Input: root = [1] Output: 0
Constraints
- 1 <= number of nodes <= 10^4
- 1 <= Node.val <= 100
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