24 users have solved this problem:

Chez, icaijy, Nick_Cpp, Informatics271, Double_Slash, ja_kingy, steveyxz, caterpillow, CarrotPlane, DamoCode, sumtec, mr_pika, JimmyWu122, liangjeremy, Matthewwww, guipenrilo, 5ilky, davidx, quollcucumber, T-Rex, X_O, os, meisean2009, iiliffe,