Define and Calculate Employee Referral Counts

You are given a roster of employees and a collection of referral records. Each record has the form [u, v], meaning employee u directly referred employee v. For every employee, compute the number of distinct employees reachable by following at least one referral edge from that employee. Count a downstream employee only once, even if they can be reached through several different referral paths. Do not count the employee whose count is being computed. Duplicate referral records…