I attended my college's career fair and dropped off my resume with Facebook. We had a nice chat.

The following week, they emailed me, asking me to come in for a first-round interview on campus. The day before the interview, we had a meet and greet in the computer science tea room. They were very friendly, and we got to know each other better.

The next day, I had my first interview. It comprised a few technical questions and runtime analysis, which I believe I answered correctly.

In the evening, they emailed me, informing me that I had advanced to the second (final) round. However, I did not manage to complete the second-round challenge within the time limit, and I was not extended an offer.

Given an array of distinct integers and a target integer t, compute all of the subsets of the array that sum to t, where order matters.

(I was given approximately 20 minutes to solve this.)