/usr/include/shogun/structure/DisjointSet.h is in libshogun-dev 3.2.0-7.5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* 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 3 of the License, or
* (at your option) any later version.
*
* Written (W) 2013 Shell Hu
* Copyright (C) 2013 Shell Hu
*/
#ifndef __DISJOINTSET_H__
#define __DISJOINTSET_H__
#include <shogun/base/SGObject.h>
#include <shogun/lib/SGVector.h>
namespace shogun
{
/** @brief Class CDisjointSet data structure for linking graph nodes
* It's easy to identify connected graph, acyclic graph, roots of forest etc.
* please refer to http://en.wikipedia.org/wiki/Disjoint-set_data_structure
*/
class CDisjointSet : public CSGObject
{
public:
/** default constructor */
CDisjointSet();
/** constructor
*
* @param num_elements number of initial disjoint elements
*/
CDisjointSet(int32_t num_elements);
/** destructor */
~CDisjointSet() { }
/** @return class name */
virtual const char* get_name() const { return "DisjointSet"; }
/** initialize internal data structures */
void make_sets();
/** find root of the set containing x with path compression
*
* @param x queried element
* @return the root
*/
int32_t find_set(int32_t x);
/** link two roots, higher ranked root will be new root
*
* @param xroot root of the set containing x
* @param yroot root of the set containing y
* @return new root
*/
int32_t link_set(int32_t xroot, int32_t yroot);
/** link the roots of two sets containing x and y respectively
* and return if they were linked
*
* @param x first element to be linked
* @param y second element to be linked
* @return if x and y were in the same set
*/
bool union_set(int32_t x, int32_t y);
/** if element x and element y is in the same set
*
* @param x first element
* @param y second element
* @return if x and y are in the same set
*/
bool is_same_set(int32_t x, int32_t y);
/** give each disjoint set a label
*
* @param out_labels label for each element
* @return number of unique labels
*/
int32_t get_unique_labeling(SGVector<int32_t> out_labels);
/** get number of sets
*
* @return number of sets
*/
int32_t get_num_sets();
/** if union-find is performed
*
* @return is connected
*/
bool get_connected();
/** set connection flag after union-find
*
* @param is_connected boolean variable
*/
void set_connected(bool is_connected);
private:
/** register parameters */
void init();
private:
/** number of elements */
int32_t m_num_elements;
/** parent array */
SGVector<int32_t> m_parent;
/** rank array */
SGVector<int32_t> m_rank;
/** connection flag */
bool m_is_connected;
};
}
#endif
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