Compilare: main.cpp: In function 'std::__cxx11::string ins(std::__cxx11::string, char, int)': main.cpp:28:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=p;i<s.size();i++) ~^~~~~~~~~ main.cpp: In function 'std::__cxx11::string unite(std::__cxx11::string, std::__cxx11::string)': main.cpp:39:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<b.size();) ~^~~~~~~~~