31 users have solved this problem:

Gomango999, he, quanlin, evanl, Tuanlinh123, minhnhatnoe, user, lion, henryho2, programmer123, dorian, nhphan0505, warren_huang, Double_Slash, angus, ralismark, RonXueAlt, Matthewwww, Lithanium, junkbot, newai, nosna, OoogaDooga, TheEpicCowOfLife, ifndef_INDEED_TIS_TRUE_HPP_, Sirhc_47, JustinWang, Vincent, Muyao_Zhang, caterpillow, iamnumber4,