TikTok Software Engineer interview questions

Interviewed for a New Grad AI/ML back-end position. First round was standard CodeSignal. Second round was a 1-hour technical interview. Despite the recruiter telling me to expect LC Med/Hard and ML theory questions, I was asked computer architecture questions. The rest of the interview was an LC Hard.

apply thru the refer link, and got the oa, finished oa and got declined. The OA is proctored and needs to present the ID. The OA contains 4 coding question and needs to finish within 70 mins