Find odd-frequency element with O(1) space

Q: Find odd-frequency element with O(1) space

This question evaluates a candidate's understanding of frequency analysis and space-efficient algorithm design for identifying the uniquely odd-occurring value in an array.

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Question

You're given an integer array where exactly one value appears an odd number of times and all other values appear an even number of times. Implement a function that returns the odd-frequency value. Follow-ups: a) Reduce extra space to O( 1). b) Analyze time and space complexity. c) Explain correctness for large inputs and negative integers.

Find odd-frequency element with O(1) space

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