Leetcode 1315. Sum of Nodes with Even-Valued Grandparent

Traverse the binary tree and return the sum of node values whose grandparent exists and is even-valued. This requires a tree traversal (DFS/BFS) while checking grandparent parity; n ≤ 10^4, node values 1–100.

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Leetcode 1315. Sum of Nodes with Even-Valued Grandparent

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