Compilare: user.cpp: In function ‘int main()’: user.cpp:52:52: warning: format ‘%s’ expects argument of type ‘char*’, but argument 2 has type ‘std::basic_string<char>::iterator {aka __gnu_cxx::__normal_iterator<char*, std::basic_string<char> >}’ [-Wformat=] for(i=0;i<nr;i++) printf("%s\n", sol[i].begin()); ^