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:34:32: 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:65:30: note: in expansion of macro ‘sz’ for (i = 0; i < G[N].sz; i++) ^