Hi, after trying to use the bellman_ford_shortest_paths I think it's a little bit strange. First of all, user is required to initialise distance map before calling the algorithm. The distance to the source vertex must be set to zero and distances to other vertices to infinity. Why can't the algorithm accept a source vertex as parameter and do initialisation itself? Dijsktra surely does not require such initialization. Another problem is that number of vertices is passed as parameter. I realize this is more flexible (for example I can compute the maximum length of all paths with less than N edges), but it's also confusing and dangerous. I've just passed a wrong variable to that parameter and spend quite some time debugging. Is it possible to provide a version of the algorithm which (1) takes just graph, without vertex number parameter (2) takes start vertex, and initialises distance map itself - Volodya