Compilare: main.cpp:72:5: warning: "/*" within comment [-Wcomment] /*for (auto itr = lowered_users.begin();itr!=lowered_users.end();itr++) main.cpp: In function 'int search_user(std::map<std::__cxx11::basic_string<char>, int>, std::map<std::__cxx11::basic_string<char>, std::__cxx11::basic_string<char> >, std::__cxx11::string)': main.cpp:14:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i<=username.length(); i++) ~^~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:61:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < user.length();i++) ~~^~~~~~~~~~~~~~~ main.cpp:84:17: warning: unused variable 'll' [-Wunused-variable] int ll = search_user(users,lowered_users,username); ^~