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lab2.py
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lab2.py
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from random import randint
from graphviz import Graph
def graph_draw(nodes, edges, name):
g = Graph(name, format="png")
for node in nodes:
g.node(str(node))
for edge in edges:
x = edge.split(' ')[0]
y = edge.split(' ')[1]
g.edge(x, y)
g.view()
def tree_deep(N, max_deep):
use_nodes = []
edges = []
deeps = {}
nodes = range(N)
root = randint(0, N - 1)
use_nodes.append(root)
nodes.remove(root)
deeps[root] = 0
while len(nodes) > 0:
a = use_nodes[randint(0, len(use_nodes) - 1)]
b = nodes[randint(0, len(nodes) - 1)]
if deeps[a] + 1 > max_deep:
continue
use_nodes.append(b)
nodes.remove(b)
deeps[b] = deeps[a] + 1
edges.append(str(a) + ' ' + str(b))
print edges
return edges
def tree_max_degree(N, max_degree):
nodes = range(N)
use_nodes = []
edges = []
degrees = {}
root = randint(0, N - 1)
use_nodes.append(root)
nodes.remove(root)
degrees[root] = 0
while len(nodes) > 0:
a = use_nodes[randint(0, len(use_nodes) - 1)]
b = nodes[randint(0, len(nodes) - 1)]
if degrees[a] + 1 > max_degree:
continue
use_nodes.append(b)
nodes.remove(b)
degrees[b] = 1
degrees[a] += 1
edges.append(str(a) + ' ' + str(b))
print edges
return edges
if __name__ == "__main__":
nodes = 100
i = 20
edges = tree_deep(nodes, i)
graph_draw(range(nodes), edges, "deep")
edges = tree_max_degree(nodes, i)
graph_draw(range(nodes), edges, "max_root")