Primathon Android Developer interview questions

The first round was a coding round with two questions. After clearing it, I got a call two days later for the next round, which was a technical interview. The interviewer asked several questions related to Android, Java, and Kotlin. He also asked me to solve a coding problem, which I did. Then he asked me to try another approach, which I also solved, and again asked for a third approach, which I solved as well. Despite performing well, I didn't get a call for the next round. I'm not sure what the interviewer was expecting—it felt like a waste of time.