Compilare: user.cpp: In function ‘int BF()’: user.cpp:9:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] #define sz size() ^ user.cpp:31:26: note: in expansion of macro ‘sz’ for(j=0;j<G[nod].sz;j++) ^ user.cpp: In function ‘int main()’: user.cpp:9:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] #define sz size() ^ user.cpp:55:22: note: in expansion of macro ‘sz’ for(i=0;i<G[N].sz;i++) ^