Compilare: user.cpp: In function ‘int find(int)’: user.cpp:12:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<H[x%hash].size(); i++) ^ user.cpp: In function ‘void df(int)’: user.cpp:29:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<vc[nod].size(); i++) ^