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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 whose bitwise AND results in zero. This lesson teaches an optimized approach that leverages precomputed pairwise AND frequencies stored in a hash map, reducing cubic time complexity to quadratic.

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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 ...