Compilare: main.cpp: In function 'void getz(std::__cxx11::string, int*)': main.cpp:8:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=2;i<s.size();i++){ ~^~~~~~~~~ main.cpp: In function 'int main()': main.cpp:46:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<=a.size()-1;i++){ ~^~~~~~~~~~~~ main.cpp:50:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<=b.size()/2;i++){ ~^~~~~~~~~~~~