I was participating in meta hacker cup as practice round is going on now. But for 2/3 questions for which the submissions i made i got presentation error. And at this point i am not able to figure out much what were the difference between them. So can someone tell me how to handle this so i don't mess up because of this.(As the contest is still going on i am not sure if i should share my code here but if someone wants i can share it to him/her personally).