Compilare: user.cpp: In member function ‘std::vector<int> Rabin_Karp::get_matches(const string&, const string&)’: user.cpp:21:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < pattern.size(); ++i) ^ user.cpp:36:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = pattern.size(); i < text.size(); ++i) ^ user.cpp: In function ‘int main()’: user.cpp:68:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < matches.size(); ++i) ^