# Definition for singly-linked list.
# class ListNode(object):
# def __init__(self, x):
# self.val = x
# self.next = None
class Solution(object):
def hasCycle(self, head):
"""
:type head: ListNode
:rtype: bool
"""
slow = head
fast = head
while(fast != None and fast.next != None):
slow = slow.next
fast = fast.next.next
if (slow==fast):
return True
return False
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