Serialize and Deserialize Binary Tree Output problem null vs. 0 as an integer not char


  • 0
    W

    Input:
    [-1,0,1]
    Output:
    [-1,null,1]
    Expected:
    [-1,0,1]

    My answer is marked wrong because of null is not matching 0?
    but null is 0 in value.

    I actually run my code on LINUX machine and compile it using g++, I do get back to the same tree, using that input.

    What is the rule here?


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