Grokking Tree Coding Patterns for Interviews
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Find maximum depth of subtree (medium)
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Problem Statement

Given the root node of a binary tree and an integer val, find the maximum depth of the subtree that starts from the node with the value equal to val. If the node with value val doesn't exist in the tree, return 0.

The depth of a node is defined as the number of edges on the longest path from the node to a leaf.

Examples

Example 1

  • Input: root = [3, 5, 4, 2, null, 1, null, 6], val = 5
  • Expected Output: 3
  • Explanation: The subtree starting from the node with value 5 has nodes 5, 2, and 6

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