Try to change this: 

    if($$tree->{left} == undef || $$tree->{right} == undef) {
        return;
}

[download]
to something like this: 
    return unless defined $$tree->{left} and defined  $$tree->{right};

[download]

In reply to Re: Tree Data Structure by Laurent_R
in thread Tree Data Structure by code-ninja

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