# Definition for singly-linked list.
# class ListNode:
# def __init__(self, x):
# self.val = x
# self.next = None
class Solution:
def middleNode(self, head):
"""
:type head: ListNode
:rtype: ListNode
"""
fast = slow = head
while(fast != None and fast.next != None):
fast = fast.next.next
slow = slow.next
return slow
Error: fast.next.next need to make sure fast.next != None
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