Code works better with custom input.But showing wrong answer while submitting

My code gives wrong answer on submission but when give sample input through custom input. I get the same sample output as shown in the question. I can’t understand what’s wrong.Please help
My solution is CodeChef: Practical coding for everyone

what problem are you asking for? We do not have access to your submission

Could possibly be from long challenge since we can’t see the submission.

october challenge