面试题26：逻辑不全，对于部分测试用例无法AC,对应LintCode 245

[FantasyJXF]

    bool hasSubtree(TreeNode *T1, TreeNode *T2)
    {
        if(T2==nullptr && T1==nullptr)
            return true;

        if (T1 != nullptr && T2!=nullptr && T1->val == T2->val)
        {
                return hasSubtree(T1->left,T2->left) && hasSubtree(T1->right,T2->right);
        }
        return false;
    }