Compilare: user.cpp: In function ‘std::vector<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::basic_string<char, std::char_traits<char>, std::allocator<char> > > > Separate(std::string&)’: user.cpp:15: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:53: warning: comparison between signed and unsigned integer expressions user.cpp:69: warning: comparison between signed and unsigned integer expressions