100.Same Tree

    /*
     * 100.Same Tree
     * 2016-3-14 by Mingyang
     * 借鉴别人的代码，简单清晰
     */
    public boolean isSameTree(TreeNode p, TreeNode q) {
        if(p == null && q == null) return true;
        if(p == null || q == null) return false;
        if(p.val == q.val)
            return isSameTree(p.left, q.left) && isSameTree(p.right, q.right);
        return false;
    }