Compilare: user.cpp: In function ‘int main()’: user.cpp:21:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(s.size()+v.size()<=cmax) ^ user.cpp:35:48: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v.size()-1;++i) ^ user.cpp:52:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v.size()-1;++i)out<<v[i]<<" "; ^