//Recursively Remove data from the Tree
void BinaryTree::rRemove(string s, TreeNode*& that) {
//Error Handling
if (that == NULL) return;
//Base Case
if (s == that->data) { remNode(that); return; }
if (s <= that->data) { rRemove(s, that->left); return; }
if (s > that->data) { rRemove(s, that->rght); return; }
cout << "Recursive Delete has Failed" << endl;
return;
}
BinaryNode *BinarySearchTree::rRemove(int x, BinaryNode *t) //throw (ItemNotFound)
{
if(t == NULL)
throw runtime_error("ITEM NOT FOUND");
if(x < t->key)
t->left = rRemove(x, t->left);
else if(x > t->key)
t->right = rRemove(x, t->right);
else if(t->left != NULL && t->right != NULL)// item x is found; t has two children
{
t->key = findMin(t->right)->key;
t->right = removeMin(t->right);
}
else { //t has only one child
BinaryNode *node = t;
t = (t->left != NULL) ? t->left : t->right;
delete node;
}
return t;
}
//Remove data from the Tree
void BinaryTree::remove(string s) { rRemove(s, root); return; }