def main():
nodelist = [(8, 2), (5, 9), (4, 3), (2, 6), (1, 7), (9, 2), (5, 5), (8, 3),
(11, 8), (6, 14)]
n = len(nodelist)
edges = edge_list(nodelist, n)
g = Graph(n)
for i in range(0, edges.shape[0]):
g.add_edge(int(edges[i][0]), int(edges[i][1]), edges[i][2])
g.toString()
start_node = 0
global visited
visited = [False] * n
plot_graph(nodelist, start_node)
def earliest_ancestor(ancestors, starting_node):
graph = Graph()
# For each pair
for i in ancestors:
# Add a vertices
graph.add_vertex(i[0]) # Parent
graph.add_vertex(i[1]) # Child
# Add an edge between the parent and the child
graph.add_edge(i[1],i[0])
q = Queue()
visited = set()
longest_path = 1
parent_end = -1
q.enqueue([starting_node])
while q.size() > 0:
path = q.dequeue()
vertex = path[-1]
if len(path) >= longest_path and vertex < parent_end or len(path) > longest_path:
parent_end = vertex
visited.add(vertex)
for neighbor in graph.vertices[vertex]:
path_add = path.copy()
path_add.append(neighbor)
q.enqueue(path_add)
return parent_end