1. If v is visited for the first time as we traverse the edge (u,v), then the edge is a treeedge.
2. Else, v has already been visited:
(a) If v is an ancestor of u, then edge (u,v) is a backedge.
(b) Else, if v is a descendant of u, then edge (u,v) is a forwardedge.
(c) Else, if v is neither an ancestor or descendant of u, then edge (u,v) is a crossedge.
1. If v is visited for the first time as we traverse the edge (u,v), then the edge is a treeedge. 2. Else, v has already been visited: (a) If v is an ancestor of u, then edge (u,v) is a backedge. (b) Else, if v is a descendant of u, then edge (u,v) is a forwardedge. (c) Else, if v is neither an ancestor or descendant of u, then edge (u,v) is a crossedge.
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