I applied through the website and received an email for scheduling a phone screen. The HR representative was very co-operative in managing time and acknowledging my problems and requests.

During the phone screen, the interviewer was rather unengaged. He didn't show any interest or provide any response, which made me panic. I expected the interviewer to actively listen to what I was saying; it seemed he was busy doing something else.

Tell me about yourself.

Given an array of prices, how will you gain maximum profit if you can buy and sell any number of times, but you can't buy on the next day you sell?