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Solution: Triples with Bitwise AND Equal To Zero

Explore how to count triplets in an array whose bitwise AND equals zero by precomputing pairwise AND frequencies and efficiently combining them with array elements. Understand a two-phase approach that improves from brute force to O(n²) time complexity using hash maps. This lesson helps you apply bitwise manipulation and hashing strategies to optimize your coding interview solutions.

Statement

You’re given an array of integers called nums. Your task is to count how many triplets of indexes (i, j, k) satisfy the condition nums[i] & nums[j] & nums[k] == 0, where & is the bitwise AND operator and 00 \leq i,, j,, k ...