Node* CommonAncestor(Node* pRoot, int val1, int val2)
{
if (nullptr == pRoot)
return nullptr;
if ( (val1 < pRoot->data) && (pRoot->data <= val2) )
return pRoot;
if (val1 > pRoot->data)
CommonAncestor(pRoot->pRight, val1, val2);
else if (val2 <= pRoot->data)
CommonAncestor(pRoot->pLeft, val1, val2);
}
Node* CommonAncestor(Node* root, Node* tar1, Node* tar2)
{
int isLeft1, isLeft2;
if (root == NULL) return NULL;
if ((root == tar1)||(root == tar2)) return root;
isLeft1 = isNodeIn(root->left, tar1);
isLeft2 = isNodeIn(root->left, tar2);
if (isLeft1 != isLeft2)
{
return root;
}
else if ((isLeft1)&&(isLeft2))
{
return CommonAncestor(root->left, tar1, tar2);
}
else
{
return CommonAncestor(root->right, tar1, tar2);
}
}
void main()
{
BSTree oBSTree;
oBSTree.Insert(100);
oBSTree.Insert(50);
oBSTree.Insert(150);
oBSTree.Insert(25);
oBSTree.Insert(75);
oBSTree.Insert(125);
oBSTree.Insert(175);
oBSTree.Insert(110);
Node* pTmp = CommonAncestor(oBSTree.pRoot, 110, 175);
cout << pTmp->data << endl;
pTmp = CommonAncestor_Book(oBSTree.pRoot, 110, 175);
cout << pTmp->data << endl;
}