题解 | #链表中倒数最后k个结点#

# class ListNode:
#     def __init__(self, x):
#         self.val = x
#         self.next = None
#
# 代码中的类名、方法名、参数名已经指定，请勿修改，直接返回方法规定的值即可
#
# 
# @param pHead ListNode类 
# @param k int整型 
# @return ListNode类
#
class Solution:
    def FindKthToTail(self , pHead , k ):
        # write code here
        length = 0
        temp = pHead
        while temp:
            length += 1
            temp = temp.next
        if k>length:
            return None
        res = pHead
        for i in range(length - k):
            res = res.next
        return res