Board Thread:Contests and Competitions/@comment-25825221-20150811213926/@comment-24275294-20150811215218

First, I'll ask "Who is +1". Before that +1 will flash yes, therefore the first one to flash YES is +1. Then I'll ask "Who is -1". All of them will flash NO. Last I'll ask "Who is -1". The one which flashes YES must be -1. Out of the two who flash NO, the one which I'm sure is not +1 is 0.