Adobe Testing Engineer interview questions

The interview consisted of 1.Written round which consists of 3 papers namely Aptitude test,Data structure and C 2.First round was more of puzzles (they really check your aptitude and ability to think under pressure) 3.Second round was more on Operating System concepts.Not going into much deeper concepts just the basic knowledge. 4.Third round was more on algorithms..Very standard algos like convert array to integer,integer to array(any base). 5.They gave me a really tough question asked me to explain on white board(called as white board round) 6.Last was HR and very informal talk like how do u like adobe...Was previous interview wet good... Finally I was not selected but many of my friends did....