Uber Machine Learning Engineer interview questions

we start with self-introduction for 5 minutes, then dive deep in to the ML problems for 20 minutes. Finally, we have 30 minutes for coding (algorithms) and 5 minutes to ask questions.

I've done quite a few coding interviews but this one was different, in a bad way. My code failed on one of the test cases and as I wanted to debug it the interviewer asked me not to print anything on the console. When I a pointed out that there was no other option to debug the code he said I should be able to always say why a code fails just by looking at it! He also gave me a "tip" that there was an issue at a certain line. After wasting quite a while on said line, I realized the issue was in fact with another line and after fixing it all test cases were passed. Then he abruptly cut the interview short and said he should leave for another meeting. TLDR: My interviewer not only did not allow me to debug my code, he also mislead me in finding the bug in it.