Confusion with one failure case with my Java solution


  • 0
    W

    my program failed at following case:

    Input [1,2]

    Output:
    [1,null,2]

    Expected:
    [1,2]

    And I debugged my codes at Tree: root as 1, right child as 2, which I think is the input tree; It could serialize & deserialize out the tree;

    So I don't understand the result;


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