# 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 arr int整型一维数组 
# @return ListNode类
#
class Solution:
    def vectorToListnode(self , arr: List[int]) -> ListNode:
        # write code here
        dummy = ListNode(0)
        pre=dummy
        for i in range(len(arr)):
            pre.next = ListNode(arr[i])
            pre=pre.next
        return dummy.next