71 users have solved this problem:

pmoore, he, eddieee, Gomango999, iamnumber4, emilyz, warren_huang, quanlin, lion, kapten_yeetmstr, evanl, WC6479, dumpy, woozlewuzzle, binhphuc, binbau10, user, harrysun2006, Edward, alexanyu, lupispuma74, newai, schua704, davinformatics, Ghetto, kidneythedolphin, tiko, xiaoxiong, WenDidIAsk, CarlosJin159, ndosh, programmer123, dorian, Philip_cpp, LeonardoDaHomer, loctildore, numb3r5, Sirhc_47, Double_Slash, Lucas4732, SirLemonMeringue, henryho2, ad_red, Joseph, pony_joe1, imsuchadale, Uasoni2, khoodan, EternalFire, ralismark, dusky, Matthewwww, OoogaDooga, awang, Lithanium, RShift, Supermarine_Spitfire, Zimo_Yoyo, Spectrum3563, wap, GMICE_89khoa, sssss, BuMiTa, doantronganh2008, hienng, Nhom9, longphuctran, dungbetele, freecoder_123, PhanAnh628, ifndef_INDEED_TIS_TRUE_HPP_