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Data structure--find the maximum value of a binary tree node

Updated to 2 days ago

public int maxTreeNode(TreeNode root)
{
	if( == null &&  == null)
		return ;
	else if( != null &&  == null)
		return  > maxTreeNode() ?  : maxTreeNode();
	else if( == null &&  != null)
		return  > maxTreeNode() ?  : maxTreeNode();
	else
	{
		if( > maxTreeNode())
			return   > maxTreeNode() ?  : 	maxTreeNode();
		else
			return maxTreeNode() > maxTreeNode() ? maxTreeNode() : maxTreeNode();
	}
}