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contar numero de edges num treemap graph

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é assim, não estou a conseguir implementar o metodo int edge( ), que consiste em retornar o número de arestas num grafo dirigido.

O graph contém nós e arestas.

Saber o numero de nós é facil:

public int nodes()
   return map.size();

Mas para saber o numero de arestas é mais complicado.

Esta é a classe do graph:

public class SMGraph<N extends Comparable<? super N>> implements Graph<N>

   private TreeMap<N,TreeSet<N>> map;

    * Constructor.
   public SMGraph()
       map = new TreeMap<N, TreeSet<N>>();

   public int edges()


Obrigado desde já!

Edited by Rui Carlos

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