How do I approach Coding & Algorithms interview questions?

Coding & Algorithms questions require understanding of core concepts and practice. PracHub provides solutions with explanations to help you master coding & algorithms interviews.

What difficulty level is this interview question?

This is a medium difficulty Coding & Algorithms question, commonly asked during Technical Screen rounds at Google.

What role is this question designed for?

This question is commonly asked for Data Engineer candidates at Google during technical interviews.

Count Special Index Pairs | Google Interview Question

Q: Count Special Index Pairs

This question evaluates understanding of parity, combinatorial counting, and array index manipulation, focusing on reasoning about even/odd products and index parity constraints.

Given an integer array nums of length n, count the number of index pairs (i, j) such that:

0 <= i < j < n
nums[i] * nums[j] is even
j - i is odd

Return the total number of such special pairs.

A product is even if at least one of the two numbers is even.

Count Special Index Pairs

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