Eroare de compilare: user.cpp: In instantiation of ‘unsigned int solve(const std::array<std::array<_Tp, _Nm>, size2>&, unsigned int) [with type = char; unsigned int size1 = 8u; unsigned int size2 = 8u]’: user.cpp:117:34: required from here user.cpp:63:30: error: ‘back’ was not declared in this scope, and no declarations were found by argument-dependent lookup at the point of instantiation [-fpermissive] back( board, count, 0, kmin ); ^ user.cpp:71:6: note: ‘template<class type, unsigned int size1, unsigned int size2> void back(const std::array<std::array<_Tp, _Nm>, size2>&, unsigned int, unsigned int, unsigned int&)’ declared here, later in the translation unit void back( const array< array< type, size1 >, size2 >& board, const unsigned count, const unsigned k, unsigned& kmin ) ^