For good answering i will upvote else   downvoted   Given an array of n elements, (possibly with some of the elements are duplicates), write an algorithm to remove all duplicates from the array in time O(n log n).

Process or set of rules that allow for the solving of specific, well-defined computational problems through a specific series of commands. This topic is fundamental in computer science, especially with regard to artificial intelligence, databases, graphics, networking, operating systems, and security.