Module org.jgrapht.core

Package org.jgrapht.alg.vertexcover

Class ClarksonTwoApproxVCImpl<V,E>

java.lang.Object

org.jgrapht.alg.vertexcover.ClarksonTwoApproxVCImpl<V,E>

Type Parameters:

V - the graph vertex type

E - the graph edge type

All Implemented Interfaces:

VertexCoverAlgorithm<V>

public class ClarksonTwoApproxVCImpl<V,E>
extends java.lang.Object
implements VertexCoverAlgorithm<V>

Implementation of the 2-opt algorithm for a minimum weighted vertex cover by Clarkson, Kenneth L. "A modification of the greedy algorithm for vertex cover." Information Processing Letters 16.1 (1983): 23-25. The solution is guaranteed to be within $2$ times the optimum solution. Runtime: $O(|E|\log |V|)$ Note: this class supports pseudo-graphs

Author:

Joris Kinable

Nested Class Summary

Nested classes/interfaces inherited from interface org.jgrapht.alg.interfaces.VertexCoverAlgorithm

VertexCoverAlgorithm.VertexCover<V>, VertexCoverAlgorithm.VertexCoverImpl<V>

Constructor Summary

Constructors

Constructor	Description
ClarksonTwoApproxVCImpl(Graph<V,E> graph)	Constructs a new ClarksonTwoApproxVCImpl instance where all vertices have uniform weights.
ClarksonTwoApproxVCImpl(Graph<V,E> graph, java.util.Map<V,java.lang.Double> vertexWeightMap)	Constructs a new ClarksonTwoApproxVCImpl instance

Method Summary

Modifier and Type	Method	Description
VertexCoverAlgorithm.VertexCover<V>	getVertexCover()	Computes a vertex cover.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

ClarksonTwoApproxVCImpl

public ClarksonTwoApproxVCImpl(Graph<V,E> graph)

Constructs a new ClarksonTwoApproxVCImpl instance where all vertices have uniform weights.

Parameters:

graph - input graph

ClarksonTwoApproxVCImpl

public ClarksonTwoApproxVCImpl(Graph<V,E> graph, java.util.Map<V,java.lang.Double> vertexWeightMap)

Constructs a new ClarksonTwoApproxVCImpl instance

Parameters:

graph - input graph

vertexWeightMap - mapping of vertex weights

Method Details

getVertexCover

public VertexCoverAlgorithm.VertexCover<V> getVertexCover()

Description copied from interface: VertexCoverAlgorithm

Computes a vertex cover.

Specified by:

getVertexCover in interface VertexCoverAlgorithm<V>

Returns:

a vertex cover