def __init__(self, graph):
assert graph.directed, "must be digraph"
DFS.__init__(self, graph)
self.id = [-1] * graph.V
self.count = 0
def __init__(self, graph):
assert graph.directed, "must be digraph"
DFS.__init__(self, graph)
self.id = [-1] * graph.V
self.count = 0
