Pergunta de entrevista da empresa Optiver

The first round is an online coding test on Hackerank. I had to sovle 2 problems in 3 hours. The first problem is about string, quite ez. The second is harder, about backtracking. I just sovled half of the tests. The second round is behavioural interview. The interviewer called from Shanghai. She is nice. She asked about my study, my projects, how I solved problems with team mates