RealNetworks Development Manager interview questions

An HR person, the hiring manager, 3-4 senior developers (that I would be managing) and a PGM were in the interview loop. It was fairly easy in general. Developers were more focused on my management style and how I would solve some of their existing issues more than technical questions. PGM asked me a problem: you have a grocery list and you go to the store. How would you write an algorithm to buy all the items on the list.