16 lines
384 B
Python
16 lines
384 B
Python
# Definition for singly-linked list.
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# class ListNode:
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# def __init__(self, x):
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# self.val = x
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# self.next = None
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class Solution:
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def hasCycle(self, head: Optional[ListNode]) -> bool:
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h2=head
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while h2 and h2.next:
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head=head.next
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h2=h2.next.next
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if head==h2:
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return True
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return False
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