Interviewer asked me some big data question, like how you would keep track of the top ten most popular events/people ignoring noise. Haven't had much big data experience so I made up something. Then we went onto a coding problem where I was asked to: Write a program, input a number. This program would repeat certain set of mathematical operations (Take digits out of number and square the digits, combine the sum) If at any point the sum is 1, return true, otherwise return false.