Compilare: user.cpp: In function ‘int bfs()’: user.cpp:31:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] foreach(G[nod].size(),i) ^ user.cpp:6:37: note: in definition of macro ‘foreach’ #define foreach(m,i) for(int i=1;i<=m;i++) ^ user.cpp: In function ‘int main()’: user.cpp:56:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] foreach(G[n].size(),i) ^ user.cpp:6:37: note: in definition of macro ‘foreach’ #define foreach(m,i) for(int i=1;i<=m;i++) ^