iHerb Software Development Engineer interview questions

Phone call from H.R. and on site panel interview, all the software development team, conducted the interview like if they were prosecutors. That's why this company has huge personal rotation. These sad little guys think they work for Google or Facebook. This is a classic question on this company "how do you find a duplicate number in a collection" he says he is the most experienced engineer in the world, he invented the algebra... according to him.