Yes, I understand it is wrong, but will codechef people rejudge after the contest is over ??
I know what “some people” means here, yup it’s incorrect but accepted. If it were incorrect(WA) at 3:09 p.m on 3rd of October, I’d have surely rechecked but it showed ac so why bother now 
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CodeChef: Practical coding for everyone is the accepted version of your code. you were fixing size of a to be n when n was not defined or had some garbage value. also your logic was not correct.