It was a friendly interview. It started by introducing myself and my areas of interest. Then, some algorithmic questions were asked, and I had a paper to write down my code. By the end, I had the chance to ask my questions from the interviewer.

I don't remember the exact question.

The first question:

Given the centers and radii of two circles, write a method to detect whether they are separated or intersected in one or two points.

The second question:

It was about binary tree search. Get prepared for sorting algorithms as well as searching algorithms.