61 users have solved this problem:

spdskatr, he, Gomango999, iamnumber4, mohnishdeshpande, dumpy, quanlin, evanl, lion, tbinhnoob, uylulu, tung, ykfoong, alexanyu, user, Edward, warren_huang, testcoder, hhyfirst, vvzz, henryho2, WenDidIAsk, davinformatics, programmer123, ndosh, lupispuma74, dorian, horiseun, Philip_cpp, loctildore, numb3r5, robinz, Double_Slash, Sirhc_47, Matthewwww, jmuzhen, pony_joe1, ad_red, Ghetto, Uasoni2, Lucas4732, Nosna, ralismark, justin_g_20, awu, OoogaDooga, dusky, Lithanium, sssss, wap, doantronganh2008, BuMiTa, GMICE_89khoa, Nhom9, PhanAnh628, pdao, hienng, Spectrum3563, dungbetele, ProperDiamond, Chez