删除从链表尾部数第n个元素。
class Node:
def init(self, data, next):
self.data = data
self.next = next
def remove_tail_nth_list(head, n):
prev, cur, tail = head, head, head
i = 0
while tail is not None:
i += 1
if i == n:
break
tail = tail.next
if i < n:
return head
while tail.next is not None:
prev = cur
tail = tail.next
cur = cur.next
if prev == head:
return head.next
prev.next = prev.next.next
return head
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