PROBLEM IN SHUTTING DOWN MY COMPUTER

After shutting down, my laptop keyboard lights are still on.The Only way i used to off is by long pressing the power button for 5 to 10 seconds 

CLICK HERE FOR SOLUTION

I FACED THE PROBLEM IN STARTING HOSTED NETWORK USING CMD

THE ERROR MESSAGE I GOT IS

The group or resource is not in the correct state to perform the requested operation error

THE SOLUTION IS HERE:click here

KNOW HOW TO PRINT THE TOP VIEW OF TREE:

                              50
                       |              |
                    30            70
                 |         |       |       |
               20       40   60     80


INORDER TRAVERSAL OF TREE 

OUTPUT SHOULD BE OF:20,30,50,70,80