CSC301: Tree code: Paranoid! [48/52] Previous pageContentsNext page

    public int size () {
        if (root == null) return 0;
        return size (root);
    }
    private static int size (Node x) {
        if (x == null) return 0;
        int sz = 1;
        if (x.left != null) sz += size (x.left);
        if (x.right != null) sz += size (x.right);
        return sz;
    }

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