Compilare: user.cpp: In function ‘void bfs(int)’: user.cpp:21:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<G[u].size();i++) ~^~~~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:35:19: warning: unused variable ‘cc’ [-Wunused-variable] int n,m,u,v,i,cc,j,s; ^~ user.cpp:35:22: warning: unused variable ‘j’ [-Wunused-variable] int n,m,u,v,i,cc,j,s; ^