Two numbers with sum closest to zero
##### Submissions: 14837   Accuracy: 29.03%   Difficulty: Easy   Marks: 2
Associated Course(s):   Interview Preparation

Given an integer array A of N elements. You need to find the sum of two elements such that sum is closest to zero.

Input:
The first line of input contains an integer T denoting the number of test cases.
The first line of each test case is N, denoting the size of array. Each test case consist of a N integers which are the array elements.

Output:
Print the requiired sum which is closest to zero.

Constraints:
1 ≤ T ≤ 100
1 ≤ N ≤ 103
-106 ≤ a[i] ≤ 106

Example:
Input
:
3
3
-8 -66 -60
6
-21 -67 -37 -18 4 -65
2
-24 -73

Output:
-68
-14
-97

Explanation:
Testcase 1: Sum of two elements closest to zero is -68 using numbers -60 and -8.

#### ** For More Input/Output Examples Use 'Expected Output' option **

Author: jain_rishabh

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