ByteDance Data Scientist interview questions

The first round is an online assessment. It has four coding problems. I feel like it's a little difficult for most data scientist positions. Especially for the last one, it belongs to the hard level of leetcode.

HR POC often gives no response to my questions. The interviewer appears to be much junior than me and very unprofessional. The interviewer who interviewed me knows little about the subject. In the end, you do not even know who is HM and what he/she exactly wants.