why editorials for all contests held on codechef isn’t available?
I think they are not required sometimes. Also , trying on your own without any help of editorials is totally worth it.
For all the external contests, codechef just serves as the technical platform for the hosting the contest. Neither the questions are framed by codechef people, neither tested. So, usually no editorials are provided by codechef. Sometimes, people who host put up the editorial themselves or you may ask your queries(after trying), here on codechef forums.
Happy coding… 
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