tree 873f3a9dbb3c885d8d7e5696c70ee30620fc078e
parent 4f0f3b5316658d0ead3635c6cf5bc727699aa8cb
author buyingyi <buyingyi@gmail.com> 1380257772 -0700
committer buyingyi <buyingyi@gmail.com> 1380257772 -0700

improve the performance of the reachability vertex and the shortest paths vertex