ByteDance interview questions

The interview lasts about 45 min. After a brief self-introduction, the interviewer asked me some of the questions about my project on the resume. Then the interviewer gave me a common string question, however I didn't manage to get the answer :(

Short interviews but duration was rather long and slow . Interviewers were nice and asked generic questions about your life, interest and understanding of company’s background. Interviewers were rather nice and quite chill throughout the process. During interview, there is someone from HR that is present to take notes.