Package algs42
Class DirectedEulerianCycle
java.lang.Object
algs42.DirectedEulerianCycle
The
DirectedEulerianCycle
class represents a data type
for finding an Eulerian cycle or path in a digraph.
An Eulerian cycle is a cycle (not necessarily simple) that
uses every edge in the digraph exactly once.
This implementation uses a nonrecursive depth-first search. The constructor takes Θ(E + V) time in the worst case, where E is the number of edges and V is the number of vertices Each instance method takes Θ(1) time. It uses Θ(V) extra space (not including the digraph).
To compute Eulerian paths in digraphs, see DirectedEulerianPath
.
To compute Eulerian cycles and paths in undirected graphs, see
EulerianCycle
and EulerianPath
.
For additional documentation, see Section 4.2 of Algorithms, 4th Edition by Robert Sedgewick and Kevin Wayne.
- Author:
- Robert Sedgewick, Kevin Wayne, Nate Liu
-
Constructor Summary
ConstructorDescriptionComputes an Eulerian cycle in the specified digraph, if one exists. -
Method Summary
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Constructor Details
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DirectedEulerianCycle
Computes an Eulerian cycle in the specified digraph, if one exists.- Parameters:
G
- the digraph
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Method Details
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cycle
Returns the sequence of vertices on an Eulerian cycle.- Returns:
- the sequence of vertices on an Eulerian cycle;
null
if no such cycle
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hasEulerianCycle
Returns true if the digraph has an Eulerian cycle.- Returns:
true
if the digraph has an Eulerian cycle;false
otherwise
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main
Unit tests theDirectedEulerianCycle
data type.- Parameters:
args
- the command-line arguments
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