Yahoo Software Engineer In Champaign interview questions

I applied online and got one phone screen and a on site the phone interview focus on really wide range, with a very easy code question and a very hard question. i didn't figured out the hard question but they still give me the onsite onsite had 4 technical interview and an addition with manager the technical interview arent that hard, espically the really coding question are really easy it covered exactly the four topics they send to me before so it's easy to prepare too but I didnt get the offer probably because I sucked the oo design questions and not good at sql