# Definition for singly-linked list.
# class ListNode(object):
# def __init__(self, x):
# self.val = x
# self.next = None class Solution(object):
def removeNthFromEnd(self, head, n):
"""
:type head: ListNode
:type n: int
:rtype: ListNode
"""
dummy=ListNode(0)
dummy.next=head p1=p2=dummy for i in range(n):
p1=p1.next
while p1.next:
p1=p1.next
p2=p2.next
p2.next=p2.next.next return dummy.next

@link http://www.cnblogs.com/zuoyuan/p/3701971.html

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