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import random
from linked_list import Node
def contains_cycle(node):
one = node
two = node
while two.next and two.next.next:
one = one.next
two = two.next.next
if one == two:
return True
return False
xs = Node(1, Node(2, Node(3)))
assert not contains_cycle(xs)
print("Success!")
a = Node(1)
b = Node(2)
c = Node(3)
a.next = b
b.next = c
c.next = random.choice([a, b, c])
assert contains_cycle(a)
print("Success!")
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