Answered: public static Graph DFS(Graph g, Node…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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public static Graph DFS(Graph g, Node nodes[]) throws InvalidGraphException,
InvalidNodeException, InvalidArcException, InvalidLabelException, InvalidEdgeException {
for (Node u : nodes) {
u.setFlags("WHITE");
}
for (Node u : nodes) {

if (u.getFlags().equals("WHITE")) {
DFS_Visit(u);
}
}

return nodes[0].getNodeGraph();
}

public static void DFS_Visit(Node u) throws InvalidGraphException,
InvalidNodeException, InvalidEdgeException, InvalidArcException {
u.setFlags("GREY");

for (Arc e : Graphs.successors(u)) {

if (Graphs.arcDst(e).getFlags().equals("WHITE")) {
Graphs.setArcColour(e, "green");
DFS_Visit(Graphs.arcDst(e));
}
}
u.setFlags("BLACK");
}

}

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