They gave me a HackerRank for the first round. It was three days long and reasonably hard.

I took about 10 hours in total to finish. I tested a bunch of edge cases and passed 100% of all their cases as well. I was pretty proud of myself for my performance.

A week later, I was rejected.

Honestly, there's a slight chance they did not like my coding style. However, I think it's more likely they just stopped hiring and had me spend 10 hours on a coding challenge that did not matter. Even getting it all right and testing for all kinds of edge cases did not lead to at least a phone screening.

I feel like they wasted an entire day of my time, and it feels insulting.

DaysBetween Function and a B-Tree Problem

This section will cover a few problems.

First, we'll look at implementing a "DaysBetween" function.

Then, we'll move on to a B-Tree problem.