LintCode Q102 Linked List Cycle in Python

  • Jinhai ZHOU
  • 3 Minutes
  • 2017年1月18日
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"""
Definition of ListNode
class ListNode(object):
def __init__(self, val, next=None):
self.val = val
self.next = next
"""
class Solution:
"""
@param head: The first node of the linked list.
@return: True if it has a cycle, or false
"""
def hasCycle(self, head):
# write your code here
if head is None:
return False
runner = head
current = head
while runner and runner.next:
runner = runner.next.next
current = current.next
if runner == current:
return True
return False
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