Compilare: main.cpp: In function 'std::__cxx11::string getmform(std::__cxx11::string)': main.cpp:8:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<s.size();i++){ ~^~~~~~~~~ main.cpp: In function 'int main()': main.cpp:22:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<s.size()-1;i++){ ~^~~~~~~~~~~ main.cpp:36:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<s.size()-1;i++){ ~^~~~~~~~~~~