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: ListNode, k: int) -> ListNode:
        # write code here
        j=0
        pre = pHead
        cur = pHead
        while True:
            if pre:
                j=j+1
                pre = pre.next
            else:
                break
        while j >= k:
            for i in range(j-k):
                cur = cur.next
            return cur
        return None