I had an on-campus interview that consisted of 30 minutes of casual conversation, along with a few problem-solving questions that heavily emphasized the process. Unfortunately, I didn't hear back for two months. I only found out that while I had passed the initial screening, Microsoft had already booked all of its interviews for the rest of the year. Microsoft is very big, and it seems easy to fall through the cracks if you don't wow your way onto the high-priority list. Some of my friends have had similar experiences.

How would you design a function to do X? (I don't remember the exact task, but it was pretty simple.)