Q1 : sort array consisting of 1s, 2s and 3s Q2 : ques on dp then system design questions not very technical more like real life case (eg: if we were to design a instagram system which had a functionality that shows "-- person liked your post -- sec/min/hrs ago" then what classes and respective data members and methods needs to be incorporated to have this functionality) so it was more like real life implementation of oops, they gave 3 such ques on instagram