//  Incorrect code that might work:

int MaxLeaf (itree t) {
    if (t->left) {
        int m1 = MaxLeaf (t->left);
        int m2 = MaxLeaf (t->right);
        if (m1 > m2)
            return m1;
        else
            return m2;
    }
    else
        return t->label;
}