SimpleInterval* IntervalTree::deleteNode(IntervalTreeNode* z)
{
IntervalTreeNode* y;
IntervalTreeNode* x;
SimpleInterval* node_to_delete = z->stored_interval;
y= ((z->left == nil) || (z->right == nil)) ? z : getSuccessor(z);
x= (y->left == nil) ? y->right : y->left;
if(root == (x->parent = y->parent))
{
root->left = x;
}
else
{
if(y == y->parent->left)
{
y->parent->left = x;
}
else
{
y->parent->right = x;
}
}
/// @brief y should not be nil in this case
/// y is the node to splice out and x is its child
if(y != z)
{
y->max_high = -std::numeric_limits<double>::max();
y->left = z->left;
y->right = z->right;
y->parent = z->parent;
z->left->parent = z->right->parent = y;
if(z == z->parent->left)
z->parent->left = y;
else
z->parent->right = y;
fixupMaxHigh(x->parent);
if(!(y->red))
{
y->red = z->red;
deleteFixup(x);
}
else
y->red = z->red;
delete z;
}
else
{
fixupMaxHigh(x->parent);
if(!(y->red)) deleteFixup(x);
delete y;
}
return node_to_delete;
}
void RBTree :: RBdelete( NodePtr z )
{
NodePtr x ;
NodePtr y = z ;
char y_original_color = y->color ;
if(z->left == nil){
x = z->right;
RBTransplant(z, z->right);
}
else if(z->right == nil){
x = z->left;
RBTransplant(z, z->left);
}
else{
y = Tree_minimum(z->right);
y_original_color = y->color;
x = y->right;
if(y->p == z){
x->p = y;
}else{
RBTransplant(y, y->right);
y->right = z->right;
y->right->p = y;
}
RBTransplant(z,y);
y->left = z->left;
y->left->p = y;
y->color = z->color;
}
if ( y_original_color == 'B' )
deleteFixup( x ) ;
}
void rbt_delete(rbt_node *z, rbt_node **root) {
rbt_node *x, *y;
/*****************************
* delete node z from tree *
*****************************/
if (!z || z == NIL) return;
if (z->left == NIL || z->right == NIL) {
/* y has a NIL node as a child */
y = z;
} else {
/* find tree successor with a NIL node as a child */
y = z->right;
while (y->left != NIL) y = y->left;
}
/* x is y's only child */
if (y->left != NIL)
x = y->left;
else
x = y->right;
/* remove y from the parent chain */
x->parent = y->parent;
if (y->parent)
if (y == y->parent->left)
y->parent->left = x;
else
y->parent->right = x;
else
{
*root = x;
}
if (y != z) {
z->key = y->key;
//CHANGE
z->associated_LRU_elem = y->associated_LRU_elem;
}
if (y->color == BLACK)
deleteFixup (x, root);
y->key = NULL;
y->associated_LRU_elem = NULL;
y->left = NULL;
y->right = NULL;
y->parent = NULL;
free (y);
}
void deleteRBNode(ppRBNode root, int val) {
// If z is the node to be deleted, then the original color of z's successor is: original_color
char original_color;
// 1. Perform standard binary-search-tree deletion
pRBNode x = BSTdelete(*root, val, &original_color);
if(x == NULL)
return ;
// 2. Fix the RB-tree if necessary
if(original_color == 'B')
deleteFixup(root, x);
}
bool RedBlackTree<Key, Data>::killNode(RedBlackNode<Key, Data> * z)
{
RedBlackNode<Key, Data> *x, *y;
if (!valid(z->left) || !valid(z->right)) {
/* y has a null node as a child */
y = z;
} else {
/* find tree successor with a null node as a child */
y = z->right;
while (valid(y->left))
y = y->left;
}
/* x is y's only child */
if (valid(y->left))
x = y->left;
else
x = y->right;
/* remove y from the parent chain */
if (valid(x)) x->parent = y->parent;
if (valid(y->parent)) {
if (y == y->parent->left)
y->parent->left = x;
else
y->parent->right = x;
} else
rootNode = x;
if (y != z) {
Dealloc(z->id);
z->id = Duplicate(y->id);
z->data = y->data;
} else {
Dealloc(y->id);
}
if (y->color == BLACK)
deleteFixup(x);
m_cachedSize--;
y->left = NULL;
y->right = NULL;
delete y;
return true;
}
// delete node
RbtStatus rbtErase(RBTreeType *tree, NodeType * z)
{
NodeType **root = &tree->root;
NodeType *x, *y;
if (z->left == SENTINEL || z->right == SENTINEL) {
// y has a SENTINEL node as a child
y = z;
} else {
// find tree successor with a SENTINEL node as a child
y = z->right;
while (y->left != SENTINEL) y = y->left;
}
// x is y's only child
if (y->left != SENTINEL)
x = y->left;
else
x = y->right;
// remove y from the parent chain
x->parent = y->parent;
if (y->parent)
if (y == y->parent->left)
y->parent->left = x;
else
y->parent->right = x;
else
*root = x;
if (y != z) {
z->key = y->key;
z->val = y->val;
}
if (y->color == BLACK)
deleteFixup (root, x, SENTINEL);
free (y);
return RBT_STATUS_OK;
}
void deleteNode(Node *z) {
Node *x, *y;
/*****************************
* delete node z from tree *
*****************************/
if (!z || z == NIL) return;
if (z->left == NIL || z->right == NIL) {
/* y has a NIL node as a child */
y = z;
} else {
/* find tree successor with a NIL node as a child */
y = z->right;
while (y->left != NIL) y = y->left;
}
/* x is y's only child */
if (y->left != NIL)
x = y->left;
else
x = y->right;
/* remove y from the parent chain */
x->parent = y->parent;
if (y->parent)
if (y == y->parent->left)
y->parent->left = x;
else
y->parent->right = x;
else
root = x;
if (y != z) z->data = y->data;
if (y->color == BLACK)
deleteFixup (x);
free (y);
}
RbtStatus rbtErase(RbtHandle h, RbtIterator i) {
NodeType *x, *y;
RbtType *rbt = h;
NodeType *z = i;
if (z->left == SENTINEL || z->right == SENTINEL) {
/* y has a SENTINEL node as a child */
y = z;
} else {
/* find tree successor with a SENTINEL node as a child */
y = z->right;
while (y->left != SENTINEL) y = y->left;
}
/* x is y's only child */
if (y->left != SENTINEL)
x = y->left;
else
x = y->right;
/* remove y from the parent chain */
x->parent = y->parent;
if (y->parent)
if (y == y->parent->left)
y->parent->left = x;
else
y->parent->right = x;
else
rbt->root = x;
if (y != z) {
z->key = y->key;
z->val = y->val;
}
if (y->color == BLACK)
deleteFixup (rbt, x);
xfree(y);
return RBT_STATUS_OK;
}
void deleteNode(RBTree *tree, Node *z) {
Node *x, *y;
if (!z || z == NIL) return;
if (z->left == NIL || z->right == NIL) {
/* y has a NIL node as a child */
y = z;
} else {
/* find tree successor with a NIL node as a child */
y = z->right;
while (y->left != NIL) y = y->left;
}
/* x is y's only child */
if (y->left != NIL)
x = y->left;
else
x = y->right;
/* remove y from the parent chain */
x->parent = y->parent;
if (y->parent)
if (y == y->parent->left)
y->parent->left = x;
else
y->parent->right = x;
else
tree->root = x;
/* free data pointed to by the node */
freeRBdata(z->data);
if (y != z)
z->data = y->data;
if (y->color == BLACK)
deleteFixup (tree, x);
free(y);
}
//红黑树删除操作
void RBTree::TreeDelete(int key)
{
Node* z = &TreeSearch(key);
Node* y = z;
Node* x;
bool y_original_colour = y->getColour();
if (z->getLeft() == NIL)
{
x = z->getRight();
transplant(z, z->getRight());
}
else if (z->getRight() == NIL)
{
x = z->getLeft();
transplant(z, z->getLeft());
}
else
{
y = &(TreeMinimum(z->getRight(), 0));
y_original_colour = y->getColour();
x = y->getRight();
if (y->getParent() == z)
x->setParent(y);
else
{
transplant(y, y->getRight());
y->setRight(z->getRight());
y->getRight()->setParent(y);
}
transplant(z, y);
y->setLeft(z->getLeft());
y->getLeft()->setParent(y);
y->setColour(z->getColour());
}
if (y_original_colour == BLACK)
deleteFixup(x);
delete z;
}
//-----------------------------------------------------------------------------
/// detach node from tree
/// \param[in] z -- the node to detach
/// \param[in] p_root - the root of the tree
//-----------------------------------------------------------------------------
void detachNode(Node *z, Node**p_root)
{
Node *x, *y, *x_par;
int f;
if(!*p_root)return;
if (!z || z == NIL) return;
if (z->left == NIL || z->right == NIL) {
/* y has a NIL node as a child */
y = z;
} else {
/* find tree successor with a NIL node as a child */
y = z->right;
while (y->left != NIL) y = y->left;
}
/* x is y's only child */
if (y->left != NIL)
x = y->left;
else
x = y->right;
/* remove y from the parent chain */
x_par = y->parent;
if(x!=NIL) x->parent = x_par;
if (y->parent)
if (y == y->parent->left)
y->parent->left = x;
else
y->parent->right = x;
else
*p_root = x;
f = (y->color == BLACK);
if (y != z)
{ /* replace z with y */
y->color = z->color ;
y->left = z->left;
y->right = z->right;
y->parent = z->parent;
if (y->parent)
if (z == y->parent->left)
y->parent->left = y;
else
y->parent->right = y;
else
*p_root = y;
if(y->left != NIL)
y->left->parent = y;
if(y->right != NIL)
y->right->parent = y;
if(x_par==z) x_par=y;
}
if(f)
deleteFixup (x, x_par, p_root);
}
int deleteSymbol(char * key)
{
SYMBOL *x, *y, *z;
int color, c;
/* find node in tree */
z = (root == NULL) ? NIL_SYM : root;
while(z != NIL_SYM)
{
if( ((c = str2cmp(key, z->name)) == 0) && ((c = strcmp(key, z->name)) == 0) )
break;
else
z = (c < 0) ? z->left : z->right;
}
if (z == NIL_SYM) return(0); /* key to delete not found */
if (z->left == NIL_SYM || z->right == NIL_SYM)
{
/* y has a NIL_SYM node as a child */
y = z;
}
else
{
/* find tree successor with a NIL_SYM node as a child */
y = z->right;
while (y->left != NIL_SYM) y = y->left;
}
/* x is y's only child */
if (y->left != NIL_SYM)
x = y->left;
else
x = y->right;
/* remove y from the parent chain */
x->parent = y->parent;
if (y->parent)
{
if (y == y->parent->left)
y->parent->left = x;
else
y->parent->right = x;
}
else
root = x;
color = y->color;
if (y != z)
{
/* swap y and z */
y->left = z->left;
y->right = z->right;
y->parent = z->parent;
if(z->parent)
{
if(z->parent->left == z)
z->parent->left = y;
else
z->parent->right = y;
}
else root = y;
y->right->parent = y;
y->left->parent = y;
y->color = z->color;
}
if (color == BLACK)
deleteFixup (x);
--symbolCount;
return TRUE;
}