Compilare: user.cpp: In function ‘void spatiere(short int, short int)’: user.cpp:21:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<a.size(); i++) ^ user.cpp:24:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i!=a.size()-1) ^ user.cpp: In function ‘int main()’: user.cpp:64:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<a.size(); i++) ^