Compilare: user.cpp: In function ‘void BFS1(int)’: user.cpp:22:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<G[nod].size();i++) ^ user.cpp: In function ‘void BFS2(int)’: user.cpp:41:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<G[nod].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:72:14: warning: ‘nod’ may be used uninitialized in this function [-Wmaybe-uninitialized] BFS2(nod); ^