TikTok Software Developer interview questions

This was for New Grad position. Applied late September and received OA invite a week later. OA had a prescheduled window of two days to complete. After completing OA, received first technical round invite a month later. Received invite to second technical round a day after first round and then HM round a day after the second technical (all rounds about 2 weeks apart). Two days after HM, invited to call with HR and received offer. Round 1: HackerRank OA, 5 questions in 120 minutes Round 2: Technical Interview Round 3: Technical Interview Round 4: Interview with Hiring Manager Overall the interviewers were all very polite throughout the interview and helpful when answering questions, which seems to be out of the norm based on the other interviews listed on this site, though all my interviewers were US based, which may have made the difference.