TikTok Software Engineer I interview questions

it took 3 round, first one wiz HR, second and third one wiz tech recruiters. not only asked you to code, but also asked a lot of OS questions. Among these two recruiters, one was good, the other one was bad. He said he just got this company like for 3 months and looked like he didn't care anything. During the interview, he constantly checked his email, his phone, and even leave the meeting while I was writing code for he said he had to reconnect his internet.

OA - 4 questions, one easy, one medium, and two hard. Hard questions do not need best solution even brute force can pass majority test cases. Whole duration 120 mins. Pass all test cases is not required to get a move.