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- class ListNode(object):
- def __init__(self, val=0, _next=None, pre=None):
- self.val = val
- self.next = _next
- self.pre = pre
- def __str__(self):
- res_str = ''
- tmp = self
- while tmp:
- res_str += str(tmp.val)
- if tmp.next:
- res_str += ","
- tmp = tmp.next
- return res_str
- def get_node(arr: list):
- dummy = ListNode(0)
- curr = dummy
- for v in arr:
- curr.next = ListNode(v)
- curr = curr.next
- return dummy.next
- def get_arr(node: ListNode):
- res_arr = []
- while node:
- res_arr.append(node.val)
- node = node.next
- return res_arr
- if __name__ == '__main__':
- head = get_node([1, 2, 3, 4, 5])
- print(head)
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