Google Software Engineer Internship interview questions

I applied online, and got an invitation for the coding round. There was 2 one-hour coding screens. The first one was a bit practical (medium level )—coding up a practical filesystem. The second was a difficult graph problem. I thought I did well, but lol, no offer.

Online assessment, I believe it was 90 minutes. Graded on accuracy and not efficiency. Received email from recruiter about a month later, and scheduled interview for 2 weeks out. 1 round of interviews, consisting of 2 45-minute technicals scheduled back to back with an hour gap in between.