Compilare: user.cpp: In function ‘int e_deja(std::string)’: user.cpp:21:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < v[s.size()].size() ; i++) ^ user.cpp: In function ‘int main()’: user.cpp:35:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 2 ; i <= sir.size() ; i++){ ^