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You should change the types that were char* to const_char_p (especially longest which is going to be returned as the latter).
The way you are iterating through the array is a bit odd. Why not do the...

First off, you need to make your specialisation fit the form of the template.
Since your template is:


template<typename T>
T maxn( T* a, int n );


Your specialisation needs to simply...