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import java.util.ArrayList;
import java.util.HashSet;
import java.util.LinkedList;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
public class BFS {
public static ArrayList<Segment> BFS(ArrayList<Node> rootnodes) {
final ArrayList<Segment> segments = new ArrayList<>();
final HashSet<Node> seen = new HashSet<>();
for (int n = 0; n < rootnodes.size(); n++) {
final int index = n;
final LinkedList<Node> children = new LinkedList<>();
segments.add(new Segment());
children.add(rootnodes.get(index));
while (!children.isEmpty()) {
final Node current = children.remove(0);
segments.get(index).add(current);
segments.get(index).setRootNode(current);
current.setSegment(segments.get(index));
for (final Node child : current.getChildren()) {
if (child.isRoot() || seen.contains(child)) {
continue;
}
children.add(child);
seen.add(child);
}
}
}
return segments;
}
}
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