50 users have solved this problem:

testcoder, eddieee, sidpark1, evanl, horiseun, henryho2, lion, ch13, Gomango999, dumpy, Yuuron, Owen24, user, davinformatics, justin_g_20, Ghetto, WenDidIAsk, SirLemonMeringue, programmer123, ndosh, dorian, Uasoni2, Philip_cpp, loctildore, numb3r5, Double_Slash, Sirhc_47, Matthewwww, pony_joe1, awu, dusky, Lithanium, OoogaDooga, anson, warren_huang, PeaceOfCake, aerobull42, BigD, chchn2507, awang, Nosna, jenny, blx330, ad_red, orac, caterpillow, Supermarine_Spitfire, finehaveanormalusername, TheEpicCowOfLife, ifndef_INDEED_TIS_TRUE_HPP_,