pycharm报错：pydev debugger: process 15180 is connecting
代码如下：
# 给定一个链表，删除链表的倒数第 n 个节点，并且返回链表的头结点。
#
# 示例：
#
# 给定一个链表: 1->2->3->4->5, 和 n = 2.
#
# 当删除了倒数第二个节点后，链表变为 1->2->3->5.
#
class ListNode:
def __init__(self, x):
self.val = x
self.next = None
class Solution:
def removeNthFromEnd(self, head: ListNode, n: int) -> ListNode:
# p=head
# q=p
# count=0
# if not head.val:return None
# while q:
# count+=1
# q=q.next
# if n>count:return None
# n=count-n+1
# if n==1:
# head=p.next
# return head
# for i in range(n-2):
# p=p.next
# des=p.next
# p.next=des.next
# return head
p1, p2 = head, head
while n:
p2 = p2.next
n -= 1
# if the n=len(list)
if not p2:
return head.next
while p2.next:
p2 = p2.next
p1 = p1.next
tmp = p1.next.next
p1.next = tmp
return head
if __name__=='__main__':
head=ListNode(1)
p=head
i=2
while i<6:
p.next=ListNode(i)
p=p.next
p.next=None
solution=Solution()
solution.removeNthFromEnd(head)
p=head
while p:
print(p.val)
p=p.next
