Compilare: user.cpp: In function ‘int main()’: user.cpp:36:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int i = 0; i < p.size(); i++ ) ^ user.cpp:47:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if ( q != p.size() - 1 ) ^ user.cpp:47:12: warning: ‘q’ may be used uninitialized in this function [-Wmaybe-uninitialized] if ( q != p.size() - 1 ) ^