Compilare: main.cpp: In function 'std::__cxx11::string ins(char, int)': main.cpp:30:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=p;i<s.size();i++) ~^~~~~~~~~ main.cpp: In function 'int main()': main.cpp:71:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<=s.size();i++) ~^~~~~~~~~~