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完成avl tree旋转

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This commit is contained in:
邹晓航
2014-10-30 14:49:24 +08:00
parent d97ee68238
commit 9fefdecc0d
1 changed files with 28 additions and 0 deletions
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28
TinySTL/AVLTree.h
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@@ -42,6 +42,11 @@ namespace TinySTL{
avl_tree& operator = (const avl_tree&) = delete;
~avl_tree(){ destroyAndDeallocateAllNodes(root_); }
void insert(const T& val);//todo
template<class Iterator>
void insert(Iterator first, Iterator last);//todo
void erase(const T& val);//todo
size_t height()const{ return root_ == 0 ? -1 : root_->height_; }
size_t size()const{ return size_; }
bool empty()const{ return root_ == 0; }
@@ -58,6 +63,25 @@ namespace TinySTL{
void print_inorder(const string& delim = " ", std::ostream& os = std::cout)const;
void print_postorder(const string& delim = " ", std::ostream& os = std::cout)const;
void print_levelorder(const string& delim = " ", std::ostream& os = std::cout)const;
private:
void singleLeftLeftRotate(node *&parent, node *&child){
parent->left_ = child->right_;
child->right_ = parent;
parent = child;//new root
}
void doubleLeftRightRotate(node *&parent, node *&child){
singleRightRightRotate(parent->left_, parent->left_->right_);
singleLeftLeftRotate(parent, parent->left_);
}
void doubleRightLeftRotate(node *&parent, node *&child){
singleLeftLeftRotate(parent->right_, parent->right_->left_);
singleRightRightRotate(parent, parent->right);
}
void singleRightRightRotate(node *&parent, node *&child){
parent->right_ = child->left_;
child->left_ = parent;
parent = child;//new root
}
private:
void destroyAndDeallocateAllNodes(node *p){
if (p != 0){
@@ -75,6 +99,10 @@ namespace TinySTL{
void print_postorder_aux(const string& delim, std::ostream& os, const node *ptr)const;
};// end of avl_tree
template<class T>
void avl_tree<T>::insert(const T& val){
}
template<class T>
void avl_tree<T>::print_preorder_aux(const string& delim, std::ostream& os, const node *ptr)const{
if (ptr != 0){
os << ptr->data_ << delim;