STL源码剖析 [容器]（十二）[RB_Tree]
2015-08-30 17:07
309 查看
关于红黑树的介绍网上也比较多比较详细，这里不啰嗦了。学习可以参考维基百科的“红黑树”。
源码：
源码：
//file RBTree.h< xmlnamespace prefix ="o" ns ="urn:schemas-microsoft-com:office:office" />
//written by saturnman
#ifndef _RB_TREE_H_
#define _RB_TREE_H_
#include<iostream>
#include<string>
#include<sstream>
#include<fstream>
using namespace std;
template<class KEY,class U>
class RB_Tree
{
private:
RB_Tree(const RB_Tree& input){}
const RB_Tree& operator=(const RB_Tree& input){}
private:
enum COLOR{RED,BLACK};
class RB_Node
{
public:
RB_Node()
{
RB_COLOR = BLACK;
right = NULL;
left = NULL;
parent = NULL;
}
COLOR RB_COLOR;
RB_Node* right;
RB_Node* left;
RB_Node* parent;
KEY key;
U data;
};
public:
RB_Tree()
{
this->m_nullNode = new RB_Node();
this->m_root = m_nullNode;
this->m_nullNode->right = this->m_root;
this->m_nullNode->left = this->m_root;
this->m_nullNode->parent = this->m_root;
this->m_nullNode->RB_COLOR = BLACK;
}
bool Empty()
{
if(this->m_root == this->m_nullNode)
{
return true;
}
else
{
return false;
}
}
//find node who's key equals to key,else find the insert point;
RB_Node* find(KEY key)
{
RB_Node* index = m_root;
while(index != m_nullNode)
{
if(key<index->key)
{
index = index->left;
}
else if(key>index->key)
{
index = index->right;
}
else
{
break;
}
}
return index;
}
bool Insert(KEY key,U data)
{
RB_Node* insert_point = m_nullNode;
RB_Node* index = m_root;
while(index!=m_nullNode)
{
insert_point = index;
if(key<index->key)
{
index = index->left;
}
else if(key>index->key)
{
index = index->right;
}
else
{
return false;
}
}
RB_Node* insert_node = new RB_Node();
insert_node->key = key;
insert_node->data = data;
insert_node->RB_COLOR = RED;
insert_node->right = m_nullNode;
insert_node->left = m_nullNode;
if(insert_point==m_nullNode) //empty tree
{
m_root = insert_node;
m_root->parent = m_nullNode;
m_nullNode->left = m_root;
m_nullNode->right = m_root;
m_nullNode->parent = m_root;
}
else
{
if(key<insert_point->key)
{
insert_point->left = insert_node;
}
else
{
insert_point->right = insert_node;
}
insert_node->parent = insert_point;
}
InsertFixUp(insert_node);
}
void InsertFixUp(RB_Node* node)
{
while(node->parent->RB_COLOR==RED)
{
if(node->parent==node->parent->parent->left)
{
RB_Node* uncle = node->parent->parent->right;
if(uncle->RB_COLOR == RED)
{
node->parent->RB_COLOR = BLACK;
uncle->RB_COLOR = BLACK;
node->parent->parent->RB_COLOR = RED;
node = node->parent->parent;
}
else if(uncle->RB_COLOR == BLACK )
{
if(node == node->parent->right)
{
node = node->parent;
RotateLeft(node);
}
else
{
node->parent->RB_COLOR = BLACK;
node->parent->parent->RB_COLOR = RED;
RotateRight(node->parent->parent);
}
}
}
else
{
RB_Node* uncle = node->parent->parent->left;
if(uncle->RB_COLOR == RED)
{
node->parent->RB_COLOR = BLACK;
uncle->RB_COLOR = BLACK;
uncle->parent->RB_COLOR = RED;
node = node->parent->parent;
}
else if(uncle->RB_COLOR == BLACK)
{
if(node == node->parent->left)
{
node = node->parent;
RotateRight(node);
}
else
{
node->parent->RB_COLOR = BLACK;
node->parent->parent->RB_COLOR = RED;
RotateLeft(node->parent->parent);
}
}
}
}
m_root->RB_COLOR = BLACK;
}
bool RotateLeft(RB_Node* node)
{
if(node==m_nullNode || node->right==m_nullNode)
{
return false;//can't rotate
}
RB_Node* lower_right = node->right;
lower_right->parent = node->parent;
node->right=lower_right->left;
if(lower_right->left!=m_nullNode)
{
lower_right->left->parent = node;
}
if(node->parent==m_nullNode) //rotate node is root
{
m_root = lower_right;
m_nullNode->left = m_root;
m_nullNode->right= m_root;
//m_nullNode->parent = m_root;
}
else
{
if(node == node->parent->left)
{
node->parent->left = lower_right;
}
else
{
node->parent->right = lower_right;
}
}
node->parent = lower_right;
lower_right->left = node;
}
bool RotateRight(RB_Node* node)
{
if(node==m_nullNode || node->left==m_nullNode)
{
return false;//can't rotate
}
RB_Node* lower_left = node->left;
node->left = lower_left->right;
lower_left->parent = node->parent;
if(lower_left->right!=m_nullNode)
{
lower_left->right->parent = node;
}
if(node->parent == m_nullNode) //node is root
{
m_root = lower_left;
m_nullNode->left = m_root;
m_nullNode->right = m_root;
//m_nullNode->parent = m_root;
}
else
{
if(node==node->parent->right)
{
node->parent->right = lower_left;
}
else
{
node->parent->left = lower_left;
}
}
node->parent = lower_left;
lower_left->right = node;
}
bool Delete(KEY key)
{
RB_Node* delete_point = find(key);
if(delete_point == m_nullNode)
{
return false;
}
if(delete_point->left!=m_nullNode && delete_point->right!=m_nullNode)
{
RB_Node* successor = InOrderSuccessor(delete_point);
delete_point->data = successor->data;
delete_point->key = successor->key;
delete_point = successor;
}
RB_Node* delete_point_child;
if(delete_point->right!=m_nullNode)
{
delete_point_child = delete_point->right;
}
else if(delete_point->left!=m_nullNode)
{
delete_point_child = delete_point->left;
}
else
{
delete_point_child = m_nullNode;
}
delete_point_child->parent = delete_point->parent;
if(delete_point->parent==m_nullNode)//delete root node
{
m_root = delete_point_child;
m_nullNode->parent = m_root;
m_nullNode->left = m_root;
m_nullNode->right = m_root;
}
else if(delete_point == delete_point->parent->right)
{
delete_point->parent->right = delete_point_child;
}
else
{
delete_point->parent->left = delete_point_child;
}
if(delete_point->RB_COLOR==BLACK && !(delete_point_child==m_nullNode && delete_point_child->parent==m_nullNode))
{
DeleteFixUp(delete_point_child);
}
delete delete_point;
return true;
}
void DeleteFixUp(RB_Node* node)
{
while(node!=m_root && node->RB_COLOR==BLACK)
{
if(node == node->parent->left)
{
RB_Node* brother = node->parent->right;
if(brother->RB_COLOR==RED)
{
brother->RB_COLOR = BLACK;
node->parent->RB_COLOR = RED;
RotateLeft(node->parent);
}
else
{
if(brother->left->RB_COLOR == BLACK && brother->right->RB_COLOR == BLACK)
{
brother->RB_COLOR = RED;
node = node->parent;
}
else if(brother->right->RB_COLOR == BLACK)//left red and right black
{
brother->RB_COLOR = RED;
brother->left->RB_COLOR = BLACK;
RotateRight(brother);
}
else if(brother->right->RB_COLOR == RED)
{
brother->RB_COLOR = node->parent->RB_COLOR;
node->parent->RB_COLOR = BLACK;
brother->right->RB_COLOR = BLACK;
RotateLeft(node->parent);
node = m_root;
}
}
}
else
{
RB_Node* brother = node->parent->left;
if(brother->RB_COLOR == RED)
{
brother->RB_COLOR = BLACK;
node->parent->RB_COLOR = RED;
RotateRight(node->parent);
}
else
{
if(brother->left->RB_COLOR==BLACK && brother->right->RB_COLOR == BLACK)
{
brother->RB_COLOR = RED;
node = node->parent;
}
else if(brother->left->RB_COLOR==BLACK)
{
brother->RB_COLOR = RED;
brother->right->RB_COLOR = BLACK;
RotateLeft(brother);
}
else if(brother->left->RB_COLOR==RED)
{
brother->RB_COLOR = node->parent->RB_COLOR;
node->parent->RB_COLOR = BLACK;
brother->left->RB_COLOR = BLACK;
RotateRight(node->parent);
node = m_root;
}
}
}
}
m_nullNode->parent = m_root;
node->RB_COLOR = BLACK;
}
inline RB_Node* InOrderPredecessor(RB_Node* node)
{
if(node==m_nullNode) //null node has no predecessor
{
return m_nullNode;
}
RB_Node* result = node->left; //get node's left child
while(result!=m_nullNode) //try to find node's left subtree's right most node
{
if(result->right!=m_nullNode)
{
result = result->right;
}
else
{
break;
}
} //after while loop result==null or result's right child is null
if(result==m_nullNode)
{
RB_Node* index = node->parent;
result = node;
while(index!=m_nullNode && result == index->left)
{
result = index;
index = index->parent;
}
result = index; // first right parent or null
}
return result;
}
inline RB_Node* InOrderSuccessor(RB_Node* node)
{
if(node==m_nullNode) //null node has no successor
{
return m_nullNode;
}
RB_Node* result = node->right; //get node's right node
while(result!=m_nullNode) //try to find node's right subtree's left most node
{
if(result->left!=m_nullNode)
{
result = result->left;
}
else
{
break;
}
} //after while loop result==null or result's left child is null
if(result == m_nullNode)
{
RB_Node* index = node->parent;
result = node;
while(index!=m_nullNode && result == index->right)
{
result = index;
index = index->parent;
}
result = index; //first parent's left or null
}
return result;
}
//debug
void InOrderTraverse()
{
InOrderTraverse(m_root);
}
void CreateGraph(string filename)
{
//delete
}
void InOrderCreate(ofstream& file,RB_Node* node)
{
//delete
}
void InOrderTraverse(RB_Node* node)
{
if(node==m_nullNode)
{
return;
}
else
{
InOrderTraverse(node->left);
cout<<node->key<<endl;
InOrderTraverse(node->right);
}
}
~RB_Tree()
{
clear(m_root);
delete m_nullNode;
}
private:
// utility function for destructor to destruct object;
void clear(RB_Node* node)
{
if(node==m_nullNode)
{
return ;
}
else
{
clear(node->left);
clear(node->right);
delete node;
}
}
private:
RB_Node *m_nullNode;
RB_Node *m_root;
};
#endif /*_RB_TREE_H_*/
//file testrb.cpp
//written by saturnman
#include<iostream>
#include<algorithm>
#include<iterator>
#include<vector>
#include<sstream>
#include"RBTree.h"
using namespace std;
int main()
{
RB_Tree<int,int> tree;
vector<int> v;
for(int i=0;i<20;++i)
{
v.push_back(i);
}
random_shuffle(v.begin(),v.end());
copy(v.begin(),v.end(),ostream_iterator<int>(cout," "));
cout<<endl;
stringstream sstr;
for(int i=0;i<v.size();++i)
{
tree.Insert(v[i],i);
cout<<"insert:"<<v[i]<<endl;
}
for(int i=0;i<v.size();++i)
{
cout<<"Delete:"<<v[i]<<endl;
tree.Delete(v[i]);
tree.InOrderTraverse();
}
cout<<endl;
tree.InOrderTraverse();
return 0;
}关于红黑树的重要应用就是linux的内核实现：/article/2766881.html
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