shunfurh 于 2017.04.19 13:08 提问
 Find the Spy

Whoooa! There is a spy in Marjar University. All we know is that the spy has a special ID card. Please find him out!
Input
There are multiple test cases. The first line of input contains an integer T indicating the number of test cases. For each test case:
The first line contains a integer N (3 ≤ N ≤ 100), which describes that there are N students need to be checked.
The second line contains N integers indicating the ID card number of N students. All ID card numbers are 32bit integers.
Output
For each test case, output the ID card number which is different from others.
Sample Input
3
10
1 1 1 1 1 1 1 1 6 1
3
9 9 8
5
90016 90016 90016 2009 90016
Sample Output6
8
2009