Question about python input.

  • 0

    Python solution give this hint as input type

            :type lists: List[ListNode]
            :rtype: ListNode

    but the test input has an example: [ [ ] ]
    I don't understand why there is a [] in a [], I think it should be [ ListNode1, ListNode2 ... ] at least it should not be [] but a None, or ListNode is an object like:

    # Definition for singly-linked list.
    # class ListNode(object):
    #     def __init__(self, x):
    #         self.val = x
    # = None

    Am I misunderstand something?

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