20 users have solved this problem:

Gomango999, he, quanlin, evanl, Tuanlinh123, minhnhatnoe, user, lion, henryho2, programmer123, dorian, nhphan0505, warren_huang, Double_Slash, pony_joe1, ralismark, RonXueAlt, Matthewwww, Lithanium, iamnumber4