Grokking Tree Coding Patterns for Interviews
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Sum of Nodes with Even-Valued Grandparent (medium)
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Problem Statement

Given the root of a binary tree, return the total sum of the values of all nodes that have a grandparent with an even number. If no such nodes exist, return 0.

A grandparent of a node is defined as the parent of its parent, if both exist.

Examples

Example 1:

  • Input: root = [4, 2, 6, 3, 5, null, 8]
  • Expected Output: 16
  • Justification: Node values 3, 5, and 8 have 4 as their grandparent. Since 4 is even, their sum is 3 + 5 + 8 = 16.

Example 2:

  • Input: root = `[2, 3, 8, null, 5, 7, null, 2, 3, 4, 5]

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