TikTok Software Engineer, Backend interview questions

Hackerrank is the first round and I was able to get only 4 out of 5 and so I am not able to tell my experience on the other rounds of the interview how it went

Programming test & interview take 1 hrs. It is a good interview for me. The interviewer is kind and descript the requirement of the test is very clear but I didn't know the library to use which make me fail this interview. I will try it again.