Compilare: user.cpp: In function ‘std::vector<std::__cxx11::basic_string<char> > parse(std::__cxx11::string)’: user.cpp:27:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<e.length();i++) ~^~~~~~~~~~~ user.cpp: In function ‘void parseF(std::__cxx11::string)’: user.cpp:85:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=k;i<e.length();i++) ~^~~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:159:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<Vars.size();i++) readVar(); ~^~~~~~~~~~~~ user.cpp: In function ‘int prec(char)’: user.cpp:71:1: warning: control reaches end of non-void function [-Wreturn-type] } ^