I had a phone interview scheduled one month later. It was hard to communicate with the interviewer in English. I should have just used Chinese from the beginning. Though I am not a native speaker, the interviewer's English level is very low. You should directly speak Chinese if you are Chinese, or speak very, very slowly. I mentioned the adjacency list when doing the graph topological sort many times, but the interviewer seemed not to know what it is.

Two coding questions to solve: one is find min in rotated sorted array and the other one is topological sort.