LintCode Q174 Remove Nth Node From End of List in Python

  • Jinhai ZHOU
  • 4 Minutes
  • 2016年11月12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 linked list.
@param n: An integer.
@return: The head of linked list.
# Total Runtime: 495 ms
# 100% test cases passed.
"""
def removeNthFromEnd(self, head, n):
# write your code here
current = head
runner = current
while n:
runner = runner.next
n -= 1
previous = current
while runner:
runner = runner.next
previous = current
current = current.next
if current == head:
return head.next
else:
previous.next = current.next if current.next is not None else None
return head
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