Wrongly flagged and rank dropped for plagiarism

Dear Codechef Support Team,
Recently, I got the notification that my account has been flagged for cheating in starters158 and my rank has been dropped.I don’t know why, but this was definitely not due to any cheating on my part, but someone else may arrive at the same logic for solving the problem. You can review all three submitted codes in that contest; I do not know which question matches other people’s solutions.
@emperor100 @admin please look into my matter, I am also not able to see myself in the contest ranklist

my codechef ID: vineet79 | CodeChef User Profile for vineet79 | CodeChef

Kindly go through my code again and make a better decision.
Thank you.