Help needed to solve the question

#1

have no idea how to approach this question?

#2

@toshitvarshney11 Think dp on this problem. Since the hashes are only upto 26 at any position you have to only consider current and current+ 1 position. If the current is greater than 2 then no need to consider further position else take it into account and add the count. If you want to have more hints on this problem. You can also try ABCDEF in spoj. It might help you too.

#3

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