The interview process is the same as described by other users.

First round is a phone interview. The interviewer asked what your favorite project is and how you expect your ideal job to be. No technical questions were asked.

Second round is the online assessment of four parts: two parts of math, one part of new programming language learning, and one part of coding. The first three parts are not hard, but the coding part is time-consuming. I thought I did well, but still got rejected, maybe because I took too much time to do the coding.

Give all combinations of k characters in a string from the alphabet. The characters in the string should be in lexical order and there should be no duplicates.