68 users have solved this problem:

testcoder, horiseun, evanl, brchen, lion, dumpy, ndosh, henryho2, bear1212, purplepygmypuff, user, numb3r5, Netanya, tomister99, inj, Gomango999, RileyO, grossly_overconfident, davinformatics, programmer123, eddieee, munux, yeyso, Ghetto, dorian, SirLemonMeringue, Salamander, ad_red, Philip_cpp, loctildore, Matthewwww, Double_Slash, Uasoni2, KarL06, jenny, BurwoodChenFamily, dusky, Lithanium, PeaceOfCake, caterpillow, ilt_cp_g, finehaveanormalusername, aerobull42, Sirhc_47, WenDidIAsk, OoogaDooga, chchn2507, OneT_Chen, warren_huang, blx330, anson, Supermarine_Spitfire, AllOuttaLeeks, Nosna, Andy, Nitro8923Ab, BobTheScience, Lucas4732, liangjeremy, Zimo_Yoyo, ifndef_INDEED_TIS_TRUE_HPP_, mtpedro, teapot911911, newai, Vivek, JustinWang, lsjo, andy_lin_159,