Compilare: user.cpp: In function ‘std::string Convert(std::string)’: user.cpp:58:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < Input.size(); ++i) ^ user.cpp: In function ‘int First_query(std::string)’: user.cpp:69:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (poz + step < Names.size() && Names[poz + step].first.substr(0, Input.size()) < Input) ^ user.cpp:71:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (poz + 1 < Names.size() && Names[poz+1].first.substr (0, Input.size()) != Input) ^ user.cpp:73:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (poz == Names.size() - 1) ^ user.cpp: In function ‘int Last_query(std::string)’: user.cpp:81:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (poz + step < Names.size() && Names[poz + step].first.substr(0, Input.size()) <= Input) ^ user.cpp: In function ‘int Find(std::string)’: user.cpp:91:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (poz + step < Names.size() && Names[poz + step].second <= Input) ^