Find value on most distinct levels

Q: Find value on most distinct levels

This is a Coding & Algorithms interview question from IXL Learning for Software Engineer roles. View the full question and solution on PracHub.

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Question

Given a binary tree whose nodes store values (e.g., characters), find the value that appears on the greatest number of distinct depth levels. For example, for the tree: A /
A B /
C C the answer is 'A' because it appears on two different levels (levels 1 and 2). Describe an algorithm, justify its correctness, and analyze its time and space complexity.

Find value on most distinct levels

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