VK Cup 2015 - Finals, online mirror F. Clique in the Divisibility Graph 数论
F.CliqueintheDivisibilityGraphtimelimitpertest1secondmemorylimitpertest256megabytesinputstandardinputoutputstandardoutputAsyoumustknow,themaximumcliqueprobleminanarbitrarygraphis NP-hard.Nevertheless,