Compilare: user.cpp: In function ‘bool bfs(int)’: user.cpp:38:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<G[V].size();++j) ^ user.cpp: In function ‘int main()’: user.cpp:85:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<sol.size();++i)cout<<sol[i]<<'\n'; ^ user.cpp:52:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j,x,y,z; ^