# 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 head ListNode类 the head # @return bool布尔型 # class Solution: def isPail(self , head: ListNode) -> bool: # write code here if not head: return False arr=[] cur =head while cur: arr.append(cur.val) cur=cur.next left =0 right=len(arr)-1 while left <=right: if arr[left]!=arr[right]: return False left+=1 right-=1 return True