Compilare: main.cpp: In function 'void eval(std::__cxx11::string)': main.cpp:20:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i < s.length() && s[i] == ',') { ~~^~~~~~~~~~~~ main.cpp: In function 'std::__cxx11::string getNume()': main.cpp:37:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i < s.length() && s[i] != '(' && s[i] != ')' && s[i] != ',') ~~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:47:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v.size(); ++i) ~~^~~~~~~~~~