After a take home programming assignment, I was given an onsite interview. The interview was five and a half hours long, broken into two "personal" interviews at 60 minutes each, two technical interviews at 90 minutes each, and a 30 minute break for lunch (on them).

The personal interviews were the normal resume discussion, "why do you want to work here", etc. kind of questions. For each technical interview I was given a problem and asked to write code to solve it. They provided a laptop (you can bring your own as well) and let me pick whatever language I wanted. The interviewers offered minimal unprompted advice, but talked through the problem with me and acted as a sounding board.

What do you see as the main difference in approaching a problem in a declarative language vs. an imperative one?