Flatenning of BST

When we are checking for left!= NULL and we are flatenning it.

Why do we have leftll.tail->right= root??
We don’t have ‘right’ defined our in class definition of linked list.

Hey @div_yanshu07
LEFTll.TAIL will point to node in tree i.e at end of LL then since its a node of we can access its right

Do a dry run for better understanding