RingCentral Developer Relations Engineer interview questions

Technical Round, 1. Given a string s, find the length of the longest substring without repeating characters. 2. Search anyting from logs Important - 1. In video call, interviewer didn't turn on his camera. Seemed low on energy. 2. Interviewer asks question like "Do you know Linux/Unix commands". You reply with yes, and name few commands you use daily. And the next question is "Do you know API documentation". No relation with the next question asked. 3. During problem solving question, interviewer went out of the world. after 10minutes he'll ask explain again