public static void BFS_Visit(Vertex<Integer> u) {
Deque<Vertex<Integer>> q = new LinkedList<>();
q.add(u);
while (!q.isEmpty()) {
Vertex<Integer> v = q.poll();
v.setMarkState(Graph.VISIT_COLOR_GREY);
for (Edge<Integer> x : v.getOutgoingEdges()) {
Vertex<Integer> ver = x.getTo();
if (ver.getMarkState() == Graph.VISIT_COLOR_WHITE) {
if (ver.getData() != 0) ver.setData(v.getData() + 1);
ver.setParent(v);
q.add(ver);
}
}
v.setMarkState(Graph.VISIT_COLOR_BLACK);
}
}
