Google Software Developer interview questions

First two in-person interviewers were engaged and highly animated about the work they do at Google. Both of these first two interviewers took me through the standard Google "write a search routine" and "describe how you would approach this sampling from a massive data set problem". The third in-person interviewer was just strange. First, he clearly was distracted from the interview process and felt put out by having to interview someone. He went through the motions of the standard type of "write some code to solve this problem" question. But any time I asked a question to clarify some part of the problem statement he grunted and glanced around the room wildly before stating that it was obvious. Once the hour was up, the interviewer stood up abruptly and said "I have to go" and left the room. With no instructions as a candidate I had to run after the interviewer to catch him outside the building to ask what happens next. To which he shrugged and said "Go home or go find HR." With no further information I decide that this wasn't a culture I was willing to work in.