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Grokking the Coding Interview Patterns in C#

Solution: Triples with Bitwise AND Equal To Zero

Explore how to count triplets in an integer array with a bitwise AND result of zero by using hash maps to precompute pairwise AND frequencies. Understand the two-phase approach that optimizes the solution from cubic to quadratic time complexity while keeping space usage constant.

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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 0≤0 \leq i,, j,, k ...