I interviewed at Shopify. On the hiring page, it was mentioned that I didn't need to write best practices, just to solve the test. The CoderPad platform also had issues. It took me almost five minutes to discover the problem, and the interviewer wasn't aware of it either, which resulted in a lot of wasted time. I completed the task in fifty minutes. A week later, I received a rejection email, stating that I couldn't finish the task in the allocated time.

You have a list of cities, a list of products, and an inventory for each product in each city. Return all cities that have the given quantity for each product.