Tesla interview questions

took five interviews to finally get in. You interview with techs, engineers ,managers, and their next of kin it seemed like. 3 interviews in Fremont and one in palo alto and then another in santa clara. You have to wait two or three weeks in-between phone appointments for your next interview.

It was a phone interview, and it took 1 hour. They asked me a question about generating all permutation of letters from all the 7-digit phone numbers that can be pressed from a phone's keypad. I tried a recursive solution to generate all the words. After that they asked usual questions about efficiency.