Find Network Calls (Also For Amazon UK :)

Problem Overview

• Given reviews[] and counts[], compute for each target in counts the total number of API calls to set every product’s reviews to that target, where each call adds or removes one review.
• Input: n products (up to 1e5) and q targets (up to 1e5), values up to 1e6; Output: an array of q totals.
• Context: E-commerce marketing at Amazon adjusting product review counts via APIs.
• From Amazon interviews; a coding interview problem often asked as an interview question (also seen at Amazon UK).