Equal Difference Pairs

Problem Overview

• Given two lists of integers (Alice and Bob), count pairs (a, b) with one from each list where their difference satisfies an equal-difference rule.
• Input: two integer arrays; Output: the number of valid pairs; constraints may bound array sizes and value ranges.
• Context: compares two datasets to find matches by a specific difference criterion.
• From Susquehanna_international_group interviews; a common coding interview problem and interview question.