edu.princeton.cs.algs4

Class NonrecursiveDFS

Object

edu.princeton.cs.algs4.NonrecursiveDFS

public class NonrecursiveDFS
extends Object

The NonrecursiveDFS class represents a data type for finding the vertices connected to a source vertex s in the undirected graph.

This implementation uses a nonrecursive version of depth-first search with an explicit stack. See DepthFirstSearch for the classic recursive version. The constructor takes Θ(V + E) time in the worst case, where V is the number of vertices and E is the number of edges. The marked(int) instance method takes Θ(1) time. It uses Θ(V) extra space (not including the graph).

For additional documentation, see Section 4.1 of Algorithms, 4th Edition by Robert Sedgewick and Kevin Wayne.

Author:

Robert Sedgewick, Kevin Wayne

Constructor Summary

Constructors

Constructor and Description
NonrecursiveDFS(Graph G, int s) Computes the vertices connected to the source vertex s in the graph G.

Method Summary

Modifier and Type	Method and Description
static void	main(String[] args) Unit tests the NonrecursiveDFS data type.
boolean	marked(int v) Is vertex v connected to the source vertex s?

Methods inherited from class Object

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

Constructor Detail

NonrecursiveDFS

public NonrecursiveDFS(Graph G,
                       int s)

Computes the vertices connected to the source vertex s in the graph G.

Parameters:

G - the graph

s - the source vertex

Throws:

IllegalArgumentException - unless 0 <= s < V

Method Detail

marked

public boolean marked(int v)

Is vertex v connected to the source vertex s?

Parameters:

v - the vertex

Returns:

true if vertex v is connected to the source vertex s, and false otherwise

Throws:

IllegalArgumentException - unless 0 <= v < V

main

public static void main(String[] args)

Unit tests the NonrecursiveDFS data type.

Parameters:

args - the command-line arguments