find some error???


  • 0
    E

    the data i use is [3,9,20,null,15,null,12,15,7]
    and I think the correct answer shoud be 24
    why it tell me 15???
    you can try it


  • 0
    Y

    The answer is 15. Because 15 is only left leaf. While 9 is left child, it is not leaf, since it has right child.


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