What does input [1,null,3] mean?

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    What does [1,null,3] input mean?

    does it mean
    null 3

    as input? Thanks

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    What is "1 / \ null 3"?

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    the format messed up. I was gonna put in a tree illustration there. root is 1, left child is null, right child is 3

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    More like you messed up the format :-). You can mark stuff and click the {} button or just indent it enough to be displayed raw:

        1                     1
       / \      or rather      \
    null  3                     3

    And yes, I'm pretty sure that's what it means. Click "read more on how binary tree is serialized on OJ" here. Got that from this answer.

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