Hi, Welcome to Small Online Judge! Small Online Judge is a place where you can practise programming with algorithm and mathematics knowledges. To start using SOJ, just 0.Register an account 1.Find a Problem which interests you 2.Write code to solve the problem 3.Submit your code to SOJ 4.SOJ will tell you whether your code is right or needs to be improved at Realtime Status. You may also view The Tour or FQA to get more information about how to use SOJ. Have fun!