// gathered with problem collector
                }
                return null;
            }
        };
    }

    private boolean addEdge(Path from, Path p, DefaultModelProblemCollector problems) {
        try {
            dag.addEdge(from.toString(), p.toString());
            return true;
        } catch (Graph.CycleDetectedException e) {
            problems.add(new DefaultModelProblem(

    edgeToReferenceNode.put(edge, nodeU);
    return true;
  }

  @Override
  @CanIgnoreReturnValue
  public boolean addEdge(EndpointPair<N> endpoints, E edge) {
    validateEndpoints(endpoints);
    return addEdge(endpoints.nodeU(), endpoints.nodeV(), edge);
  }

  @Override
  @CanIgnoreReturnValue
  public boolean removeNode(N node) {
    checkNotNull(node, "node");

    edgeToReferenceNode.put(edge, nodeU);
    return true;
  }

  @Override
  @CanIgnoreReturnValue
  public boolean addEdge(EndpointPair<N> endpoints, E edge) {
    validateEndpoints(endpoints);
    return addEdge(endpoints.nodeU(), endpoints.nodeV(), edge);
  }

  @Override
  @CanIgnoreReturnValue
  public boolean removeNode(N node) {
    checkNotNull(node, "node");

   * @throws IllegalArgumentException if the introduction of the edge would violate {@link
   *     #allowsParallelEdges()} or {@link #allowsSelfLoops()}
   */
  @CanIgnoreReturnValue
  boolean addEdge(N nodeU, N nodeV, E edge);

  /**
   * Adds {@code edge} connecting {@code endpoints}. In an undirected network, {@code edge} will
   * also connect {@code nodeV} to {@code nodeU}.
   *

   * @throws IllegalArgumentException if the introduction of the edge would violate {@link
   *     #allowsParallelEdges()} or {@link #allowsSelfLoops()}
   */
  @CanIgnoreReturnValue
  boolean addEdge(N nodeU, N nodeV, E edge);

  /**
   * Adds {@code edge} connecting {@code endpoints}. In an undirected network, {@code edge} will
   * also connect {@code nodeV} to {@code nodeU}.
   *

	if _, ok := g.byLabel[label]; ok {
		return false
	}
	g.byLabel[label] = len(g.Nodes)
	g.Nodes = append(g.Nodes, label)
	g.edges[label] = map[string]bool{}
	return true
}

func (g *Graph) AddEdge(from, to string) {
	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
	}

	// flow adds an edge from vertex src representing that typ flows to tpar.
	flow := func(src int, typ Type) {
		weight := 1
		if typ == targ {
			weight = 0
		}

		w.addEdge(w.typeParamVertex(tpar), src, weight, pos, targ)
	}

	// Recursively walk the type argument to find any defined types or
	// type parameters.
	var do func(typ Type)
	do = func(typ Type) {

  }
  if (replaced_) {
    return errors::Internal("BackEdgeHelper Replace called more than once.");
  }
  replaced_ = true;
  for (const BackEdge& be : back_edges_) {
    graph_->AddEdge(be.src, be.src_output, be.dst, be.dst_input);
  }
  return absl::OkStatus();
}

  TF_ASSIGN_OR_RETURN(Node * new_in, graph_->AddNode(new_in_def));

  for (const Edge* e : n->in_edges()) {
    if (e->IsControlEdge()) {
      graph_->AddControlEdge(e->src(), new_in);
    } else {
      graph_->AddEdge(e->src(), e->src_output(), new_in, e->dst_input());
    }
  }

  new_in->set_assigned_device_name(n->assigned_device_name());
  return new_in;
}

namespace {
absl::StatusOr<bool> IsConstantSmall(Node* n) {

 * under the License.
 */
package org.apache.maven.model.building;

import java.util.*;

class Graph {

    final Map<String, Set<String>> graph = new LinkedHashMap<>();

    synchronized void addEdge(String from, String to) throws CycleDetectedException {
        if (graph.computeIfAbsent(from, l -> new HashSet<>()).add(to)) {