In the source code file provided:

$$ complete the missing subroutines for performing operations related to the erase method

of the $($ordered$)$ map ADT implemented using a general BST $($BSTMap class$)$

$$ complete the missing subroutines for performing restructuring$/$rebalance operations in

the tree for a map ADT implemented using an AVL Tree $($AVLTreeMap class, which

extends the BSTMap class$)$

$$ complete the missing subroutines for performing operations required by another implementation of the map ADT $($TreeMapStats class$)$ that extends a node data structure in

an AVL tree to include and maintin statistics$/$information about the value of the map

related to all the entries stored in the subtree rooted by that node