Today's problem B : https://codeforces.com/contest/652/problem/C
Isn't it the case of stealing/copying a problem? The problem statement was changed only, the problem remains completely the same.
So will it be unrated? Or the copying rule was only for Indian authors?
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Problem in general is very well known. If we unrate every contest which had reused ideas for A or B, half of the contests will be unrated
these 2 problems are not the same cuz the input of 1771B does not contain a permutation, and the code of solutions of 652C can not pass 1771B directly.