Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:16:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(register int i=0;i<L[nod].size();i++){ ^ user.cpp: In function ‘int main()’: user.cpp:28:17: warning: unused variable ‘j’ [-Wunused-variable] register int i,j,x,y,d; ^ user.cpp:54:8: warning: ‘p’ may be used uninitialized in this function [-Wmaybe-uninitialized] dfs(p); ^