Grokking 75: Top Coding Interview Questions
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Solution: Pseudo-Palindromic Paths in a Binary Tree
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Problem Statement

Given a binary tree where each node has a value between 1 and 9, return the number of "pseudo-palindromic" paths from the root node to any leaf node.

A path is called "pseudo-palindromic" if the values along the path can be rearranged to form a palindrome.

Examples

Example 1

  • Input: 
        5
   / \
  4   1
 / \   \
4   1   1
  • Expected Output: 2
  • Justification: The paths are:
    • 5 → 4 → 4 (pseudo-palindromic: "5, 4, 4" can be rearranged to "4, 5, 4")

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