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In Objective-C. Below code will give O(n) complexity. Each time in a loop we will compare currentIndex Person with nextIndex person. If we find that currentIndex person knows nextIndex person but nextIndex person doesn't know currentIndex person then our famousPerson would be nextIndex person for the time being. We will use this famous person to compare with next person in the array untill we reach the end of loop. At the end of loop, we will have famous person.
- Adesh June 26, 2017