Doesn't matter if you give right or wrong answers here, in this company people seem to save their positions for high salaries, so may not select you if they see possible competitor in you. I gave the answer for all the above questions with the working code for the problems asked, but on asking for the feedback I got the response that I don't have knowledge about threading, not proper coding & design skills. Means seriously? Is this kind of fraud you people do in name of interviews when I know that this interviewer himself took the questions from internet & possibly was not aware about one solution I gave for thread ordering & pair of numbers question. And I know such people who take the answers from the candidates & show them as their own during their future interviews or in projects.