51 users have solved this problem:

testcoder, Gomango999, iamnumber4, dumpy, hollwo_pelw, mike4235, quanlin, evanl, he, trangim, munux, brchen, lion, user, phoebe, alexanyu, CarlosJin159, davinformatics, henryho2, horiseun, Ghetto, Salamander, programmer123, xiaoxiong, yeyso, Uasoni2, dorian, ndosh, WenDidIAsk, loctildore, dylanp, ImMcHe, Double_Slash, Philip_cpp, BobTheScience, pony_joe1, Lucas4732, caterpillow, Lithanium, BigD, Matthewwww, SirLemonMeringue, Vedang, OneT_Chen, blx330, KarL06, HappyCapybara, GMICE_89khoa, OoogaDooga, jenny, Supermarine_Spitfire