class Node(object): def __init__(self,value): self.value = value self.nextnode = None a = Node(1) b = Node(2) c = Node(3) d = Node(4) e = Node(5) x = Node(10) y = Node(20) z = Node(30) a.nextnode = b b.nextnode = c c.nextnode = d d.nextnode = e e.nextnode = c x.nextnode = y y.nextnode = z def cycle_check_any(node): slow_p = node fast_p = node while fast_p !=None and fast_p.nextnode !=None: slow_p = slow_p.nextnode fast_p = fast_p.nextnode.nextnode if fast_p == slow_p: return True return False ########################## result = cycle_check_any(a) print(result) result = cycle_check_any(x) print(result)
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