Got a code assignment with a deadline of one week and the remark "show us your C++ skills!". So I did, with CRTP and vectorization; I think I invested more time and effort in the assignment than it can be reasonably expected from an applicant. During the interview they introduced the company and what were working on, and then we discussed some aspects of my solution to the coding assignment and a few related C++ topics. Nothing particularly difficult, but one of my answers suffered from a possible division by zero, which noone pointed out during the interview, and it only occured to me on my way home. After the interview they asked for my salary expectation, and then within a day they decided not to make an offer.