Finding an Impostor - Computer Engineering - Lecture Slides, Slides of Computer Science

Download Finding an Impostor - Computer Engineering - Lecture Slides and more Slides Computer Science in PDF only on Docsity! Finding an Impostor There are three people of a certain profession (say, medical doctors) in a room, but one of them may be an impostor. Each person asks the other two a question that can determine whether the person is real. The six yes (real) / no (impostor) opinions are presented to a judge who must decide whether an impostor is present and, if so, who it is. How would the judge go about deciding? Somewhat similar to the fake coin puzzle A real person always arrives at the correct judgment about another one, but an imposter may render an incorrect judgment 1 2 3 -- N Y N -- N Y N -- 1 2 3 Person assessed 1 2 3 A s s e s s o r Assessment matrix A Assessment matrix B -- N Y Y -- N Y N -- 1 2 3 Person assessed 1 2 3 A s s e s s o r Docsity.com Impostors at a Dinner Table At a round dinner table, n people of a certain profession (say, computer engineers) try to determine if there are impostors among them. Each asks the person to his or her right a question and renders a judgment. Assumptions are identical to the previous puzzle. How many impostors can be correctly identified? Repeat the puzzle above, but this time assume that each person asks a question of his/her neighbor on both sides Docsity.com