Compilare: user.cpp: In function ‘bool rez(std::__cxx11::string)’: user.cpp:12:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(s.size()>n)return 0; ~~~~~~~~^~ user.cpp:30:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<s.size();i++) ~^~~~~~~~~ user.cpp:32:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(s.size()!=n)return 0; ~~~~~~~~^~~