Compilare: user.cpp: In function ‘std::vector<std::vector<int> > getHashValues(std::string)’: user.cpp:25:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<s.size(); ++i){ ^ user.cpp: In function ‘void solve()’: user.cpp:58:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1; i<text.size(); ++i){ ^ user.cpp:71:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=pattern.size()-1; i<text.size(); ++i){ ^