}

		// Find all incoming edges into s.
		a := sort.Search(len(edges), func(i int) bool { return edges[i].to >= s })
		b := sort.Search(len(edges), func(i int) bool { return edges[i].to > s })

		// Decrement the import count for all packages that import s.
		// If the count reaches 0, that package is now ready to schedule.
		for _, e := range edges[a:b] {
			m[e.from]--
			if m[e.from] == 0 {

        assertNotNull(res.getExcidentEdges(v1), "no edges in the resulting graph after resolver");

        assertEquals(4, res.getVertices().size(), "wrong # of vertices in the resulting graph after resolver");
        assertEquals(
                2,
                res.getExcidentEdges(v1).size(),
                "wrong # of excident edges in the resulting graph entry after resolver");

        assertEquals(

 * terms</a>):
 *
 * <ul>
 *   <li>directed graphs
 *   <li>undirected graphs
 *   <li>graphs that do/don't allow parallel edges
 *   <li>graphs that do/don't allow self-loops
 *   <li>graphs whose nodes/edges are insertion-ordered, sorted, or unordered
 *   <li>graphs whose edges are unique objects
 * </ul>
 *
 * <h3>Building a {@code Network}</h3>
 *

		return math.NaN(), false
	}

	// Sort edges.
	edges := d.unsorted
	slices.SortFunc(edges, func(a, b edge) int {
		return cmp.Compare(a.x, b.x)
	})
	// Merge with sorted edges.
	d.unsorted = nil
	if d.sorted == nil {
		d.sorted = edges
	} else {
		oldSorted := d.sorted
		newSorted := make([]edge, len(oldSorted)+len(edges))
		i, j := 0, 0
		for o := range newSorted {

	g.edges[from][to] = true
}

func (g *Graph) DelEdge(from, to string) {
	delete(g.edges[from], to)
}

func (g *Graph) HasEdge(from, to string) bool {
	return g.edges[from] != nil && g.edges[from][to]
}

func (g *Graph) Edges(from string) []string {
	edges := make([]string, 0, 16)
	for k := range g.edges[from] {
		edges = append(edges, k)
	}
	slices.SortFunc(edges, func(a, b string) int {

 *   <li>graphs that do/don't allow self-loops
 *   <li>graphs whose nodes/edges are insertion-ordered, sorted, or unordered
 *   <li>graphs whose edges have associated values
 * </ul>
 *
 * <p>{@code ValueGraph}, as a subtype of {@code Graph}, explicitly does not support parallel edges,
 * and forbids implementations or extensions with parallel edges. If you need parallel edges, use

    // Other edge in `edges` might have `e->dst()` as src or dst
    // node. Before removing `e->dst()`, replace those edges with
    // corresponding edges for `dst_replace_node`.
    for (int j = i + 1, end = edges.size(); j < end; j++) {
      if (edges[j].dst_node_id == edges[i].dst_node_id) {
        edges[j].dst_node_id = dst_replace_node->id();
      }
    }
  }

  Set<N> nodes();

  /** Returns all edges in this graph. */
  Set<EndpointPair<N>> edges();

  //
  // Graph properties
  //

  /**
   * Returns true if the edges in this graph are directed. Directed edges connect a {@link
   * EndpointPair#source() source node} to a {@link EndpointPair#target() target node}, while
   * undirected edges connect a pair of nodes to each other.
   */
  boolean isDirected();

  Set<N> nodes();

  /** Returns all edges in this graph. */
  Set<EndpointPair<N>> edges();

  //
  // Graph properties
  //

  /**
   * Returns true if the edges in this graph are directed. Directed edges connect a {@link
   * EndpointPair#source() source node} to a {@link EndpointPair#target() target node}, while
   * undirected edges connect a pair of nodes to each other.
   */
  boolean isDirected();

        && network.allowsParallelEdges()
        && network.edges().size() > network.asGraph().edges().size()) {
      return true;
    }
    return hasCycle(network.asGraph());
  }

  /**
   * Performs a traversal of the nodes reachable from {@code node}. If we ever reach a node we've
   * already visited (following only outgoing edges and without reusing edges), we know there's a
   * cycle in the graph.
   */