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
        dummy = pHead
        l = []
        while dummy:
            l.append(dummy.val)
            dummy = dummy.next

        if k > len(l) or k == 0:
            return dummy

        h = pHead
        while h:
            if h.val == l[-k]:
                return h
            h = h.next
        return h