Feedback for BLAST3 problem

Problem Link: BLAST3 Problem - CodeChef


editorial is very badly explained. Educator has no clear understanding of the problem. He couldn’t explain why index when chosen from right is given index n-1-j. Pathetic explanation

I haven’t seen the editorial yet but i came up with my own logic and it got ac.
i’ll give u some hints.
if n%3==1 then ans would be yes u can always make palindrome of size 1.
and if u some how able to make the starting and ending character of the string same then it would be yes always.