I think it

I think it

时间： 1ms        内存：32M

描述：

Xiao Ming is only seven years old, Now I give him some numbers, and ask him what is the second largest sum if he can choose a part of them. For example, if I give him 1 、 2 、 3 ， then he should tell me 5 as 6 is the largest and 5 is the second. I think it is too hard for him, isn ’ t it?

输入：

Standard input will contain multiple test cases. The first line of the input is a single integer T (1 <= T <=10) which is the number of test cases. And it will be followed by T consecutive test cases.

Each test case starts with a line containing an integer N (1<N<10) , the number I give Xiao Ming . The second line contains N Integer numbers ai (-10<ai<10),

输出：

For each test case, output the answer.

示例输入：

2
3
1 2 3
4
0 1 2 3

示例输出：

5
5

提示：

参考答案：

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