Count Triplets with Even XOR Set Bits I: coding question

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Count the number of index triplets (i<j<k) in an integer array such that the XOR of the three elements has an even number of set bits. Key insight: only the parity of each element's popcount matters, so you can group numbers by even/odd popcount and use combinatorics to count valid triplets.

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Leetcode 3199. Count Triplets with Even XOR Set Bits I
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Count Triplets with Even XOR Set Bits I

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Count Triplets with Even XOR Set Bits I

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