ceph/src/boost/libs/graph/example/bfs.expected

   1 0 --> 2
   2 1 --> 1 3 4
   3 2 --> 1 3 4
   4 3 --> 1 4
   5 4 --> 0 1
   6 0 --> 2
   7 1 --> 1 3 4
   8 2 --> 1 3 4
   9 3 --> 1 4
  10 4 --> 0 1
  11 distances: 0 2 1 2 2
  12 parent[0] = 0
  13 parent[1] = 2
  14 parent[2] = 0
  15 parent[3] = 2
  16 parent[4] = 2