org.jgrapht.alg.interfaces

Interface LowestCommonAncestorAlgorithm<V>

Type Parameters:

V - vertex the graph vertex type

All Known Implementing Classes:

BinaryLiftingLCAFinder, EulerTourRMQLCAFinder, HeavyPathLCAFinder, NaiveLCAFinder, TarjanLCAFinder

public interface LowestCommonAncestorAlgorithm<V>

Algorithm to compute a lowest common ancestor in a tree, forest or DAG.

Author:

Alexandru Valeanu

Method Summary

Modifier and Type	Method and Description
default java.util.List<V>	getBatchLCA(java.util.List<Pair<V,V>> queries) Return a list of LCAs for a batch of queries
default java.util.List<java.util.Set<V>>	getBatchLCASet(java.util.List<Pair<V,V>> queries) Return a list of computed sets of LCAs for a batch of queries
V	getLCA(V a, V b) Return the LCA of a and b
java.util.Set<V>	getLCASet(V a, V b) Return the computed set of LCAs of a and b

Method Detail

getLCA

V getLCA(V a,
         V b)

Return the LCA of a and b

Parameters:

a - the first element to find LCA for

b - the other element to find the LCA for

Returns:

the LCA of a and b, or null if there is no LCA.

getBatchLCA

default java.util.List<V> getBatchLCA(java.util.List<Pair<V,V>> queries)

Return a list of LCAs for a batch of queries

Parameters:

queries - a list of pairs of vertices

Returns:

a list L of LCAs where L(i) is the LCA for pair queries(i)

getLCASet

java.util.Set<V> getLCASet(V a,
                           V b)

Return the computed set of LCAs of a and b

Parameters:

a - the first element to find LCA for

b - the other element to find the LCA for

Returns:

the set LCAs of a and b, or empty set if there is no LCA computed.

Throws:

java.lang.UnsupportedOperationException - - if the operation is not supported by the implementing class

getBatchLCASet

default java.util.List<java.util.Set<V>> getBatchLCASet(java.util.List<Pair<V,V>> queries)

Return a list of computed sets of LCAs for a batch of queries

Parameters:

queries - a list of pairs of vertices

Returns:

a list L of LCAs where L(i) is the computed set of LCAs for pair queries(i)