Disjoint Set (Union Find)

Detailed Description

weighted disjoint set (union find) data structure with path compression

Weighted Disjoint Set is a data structure to quickly update and query connectedness information between nodes of a graph. Disjoint Set is also known as Union Find.

Functions
SCIP_EXPORT void	SCIPdisjointsetClear (SCIP_DISJOINTSET *djset)
SCIP_EXPORT int	SCIPdisjointsetFind (SCIP_DISJOINTSET *djset, int element)
SCIP_EXPORT void	SCIPdisjointsetUnion (SCIP_DISJOINTSET *djset, int p, int q, SCIP_Bool forcerepofp)
SCIP_EXPORT int	SCIPdisjointsetGetComponentCount (SCIP_DISJOINTSET *djset)
SCIP_EXPORT int	SCIPdisjointsetGetSize (SCIP_DISJOINTSET *djset)
SCIP_EXPORT SCIP_RETCODE	SCIPcreateDisjointset (SCIP *scip, SCIP_DISJOINTSET **djset, int ncomponents)
SCIP_EXPORT void	SCIPfreeDisjointset (SCIP *scip, SCIP_DISJOINTSET **djset)

Function Documentation

SCIPdisjointsetClear()

SCIP_EXPORT void SCIPdisjointsetClear

(

SCIP_DISJOINTSET *

djset

)

clears the disjoint set (union find) structure djset

Parameters

djset

disjoint set (union find) data structure

Definition at line 10639 of file misc.c.

References SCIP_DisjointSet::componentcount, SCIP_DisjointSet::parents, SCIP_DisjointSet::size, and SCIP_DisjointSet::sizes.

Referenced by SCIPdisjointsetCreate(), and SCIPrealHashCode().

SCIPdisjointsetFind()

SCIP_EXPORT int SCIPdisjointsetFind	(	SCIP_DISJOINTSET *	djset,
		int	element
	)

finds and returns the component identifier of this element

Parameters

djset	disjoint set (union find) data structure
element	element to be found

Definition at line 10656 of file misc.c.

References SCIP_DisjointSet::parents.

Referenced by computeComponents(), SCIPcliquetableGetVarComponentIdx(), SCIPdisjointsetUnion(), and SCIPrealHashCode().

SCIPdisjointsetUnion()

SCIP_EXPORT void SCIPdisjointsetUnion	(	SCIP_DISJOINTSET *	djset,
		int	p,
		int	q,
		SCIP_Bool	forcerepofp
	)

merges the components containing the elements p and q

Parameters

djset	disjoint set (union find) data structure
p	first element
q	second element
forcerepofp	force representative of p to be new representative

Definition at line 10683 of file misc.c.

References SCIP_DisjointSet::componentcount, NULL, SCIP_DisjointSet::parents, SCIPdisjointsetFind(), SCIP_DisjointSet::size, and SCIP_DisjointSet::sizes.

Referenced by cliquetableUpdateConnectednessClique(), computeComponents(), and SCIPrealHashCode().

SCIPdisjointsetGetComponentCount()

SCIP_EXPORT int SCIPdisjointsetGetComponentCount

(

SCIP_DISJOINTSET *

djset

)

returns the number of independent components in this disjoint set (union find) data structure

Parameters

djset

disjoint set (union find) data structure

Definition at line 10753 of file misc.c.

References SCIP_DisjointSet::componentcount, and NULL.

Referenced by SCIPcliquetableComputeCliqueComponents(), and SCIPrealHashCode().

SCIPdisjointsetGetSize()

SCIP_EXPORT int SCIPdisjointsetGetSize

(

SCIP_DISJOINTSET *

djset

)

returns the size (number of nodes) of this disjoint set (union find) data structure

Parameters

djset

disjoint set (union find) data structure

Definition at line 10763 of file misc.c.

References NULL, and SCIP_DisjointSet::size.

Referenced by SCIPcliquetableGetVarComponentIdx(), and SCIPrealHashCode().

SCIPcreateDisjointset()

SCIP_EXPORT SCIP_RETCODE SCIPcreateDisjointset	(	SCIP *	scip,
		SCIP_DISJOINTSET **	djset,
		int	ncomponents
	)

creates a disjoint set (union find) structure djset for ncomponents many components (of size one)

creates a disjoint set (union find) structure uf for ncomponents many components (of size one)

Parameters

scip	SCIP data structure
djset	disjoint set (union find) data structure
ncomponents	number of components

Definition at line 644 of file scip_datastructures.c.

References Scip::mem, NULL, SCIP_Mem::probmem, SCIP_CALL, SCIP_OKAY, and SCIPdisjointsetCreate().

Referenced by computeComponents().

SCIPfreeDisjointset()

SCIP_EXPORT void SCIPfreeDisjointset	(	SCIP *	scip,
		SCIP_DISJOINTSET **	djset
	)

frees the disjoint set (union find) data structure

Parameters

scip	SCIP data structure
djset	disjoint set (union find) data structure

Definition at line 659 of file scip_datastructures.c.

References Scip::mem, NULL, SCIP_Mem::probmem, and SCIPdisjointsetFree().

Referenced by computeComponents().