Optiver SDE-intern interview questions

The online assessment round was implementation based and pretty straight forward. The group discussion round after this was unexpected and did not have technical based round. It was based on a logical puzzle

Asked a hard question on hackerrank. The process was pretty smooth but I'm a little pissed that I didn't write python. Pleasee don't use Java for their interview because it takes so much time to write and less time to think.