86 lines
2.6 KiB
C
86 lines
2.6 KiB
C
/* Et-forest data structure implementation.
|
|
Copyright (C) 2002, 2003 Free Software Foundation, Inc.
|
|
|
|
This program is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 2 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program; if not, write to the Free Software
|
|
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
|
|
|
|
/* This package implements ET forest data structure. Each tree in
|
|
the structure maintains a tree structure and offers logarithmic time
|
|
for tree operations (insertion and removal of nodes and edges) and
|
|
poly-logarithmic time for nearest common ancestor.
|
|
|
|
ET tree stores its structure as a sequence of symbols obtained
|
|
by dfs(root)
|
|
|
|
dfs (node)
|
|
{
|
|
s = node;
|
|
for each child c of node do
|
|
s = concat (s, c, node);
|
|
return s;
|
|
}
|
|
|
|
For example for tree
|
|
|
|
1
|
|
/ | \
|
|
2 3 4
|
|
/ |
|
|
4 5
|
|
|
|
the sequence is 1 2 4 2 5 3 1 3 1 4 1.
|
|
|
|
The sequence is stored in a slightly modified splay tree.
|
|
In order to support various types of node values, a hashtable
|
|
is used to convert node values to the internal representation. */
|
|
|
|
#ifndef _ET_TREE_H
|
|
#define _ET_TREE_H
|
|
|
|
#include <ansidecl.h>
|
|
#include <stddef.h>
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif /* __cplusplus */
|
|
|
|
/* The node representing the node in an et tree. */
|
|
struct et_node
|
|
{
|
|
void *data; /* The data represented by the node. */
|
|
|
|
int dfs_num_in, dfs_num_out; /* Number of the node in the dfs ordering. */
|
|
|
|
struct et_node *father; /* Father of the node. */
|
|
struct et_node *son; /* The first of the sons of the node. */
|
|
struct et_node *left;
|
|
struct et_node *right; /* The brothers of the node. */
|
|
|
|
struct et_occ *rightmost_occ; /* The rightmost occurence. */
|
|
struct et_occ *parent_occ; /* The occurence of the parent node. */
|
|
};
|
|
|
|
struct et_node *et_new_tree (void *data);
|
|
void et_free_tree (struct et_node *);
|
|
void et_set_father (struct et_node *, struct et_node *);
|
|
void et_split (struct et_node *);
|
|
struct et_node *et_nca (struct et_node *, struct et_node *);
|
|
bool et_below (struct et_node *, struct et_node *);
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif /* __cplusplus */
|
|
|
|
#endif /* _ET_TREE_H */
|