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Grokking the Coding Interview Patterns in Python

Solution: Triples with Bitwise AND Equal To Zero

Explore how to efficiently count triplets in an integer array whose bitwise AND result is zero by precomputing pairwise AND frequencies. Understand and implement a hash map based solution that reduces brute force complexity, making it practical for array sizes up to 1000 elements.

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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 ...