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Pair Sum in Vector
Easy Accuracy: 74.14% Submissions: 7487 Points: 2

Pairs and vectors can be used together to achieve some amazing results. Here we will learn to use a vector that holds pairs.
You are given a vector V of size n. The vector hold pair of integers. Example V={(1,2),(3,4)...}. Now, you need to sum the second elements.

Input Format:
The first line of input contains T denoting the number of testcases. T testcases follow. Each testcase contains two lines of input. The first line contains n denoting the size of the array. The second line contains 2*n elements.

Output Format:
For each testcase, in a new line, print the required output.

Since this is a function problem, you don't need to take any input. Just complete the provided function sum().

Constraints:
1 <= T <= 100
1 <= n <= 107
0 <= Vi <= 107

Examples:
Input:

1
5
1 2 3 4 5 6 7 8 9 10
Output:
30

Explanation:
Testcase1:

v[0]= 1,2
v[1]= 3,4
v[2]= 5,6
v[3]= 7,8
v[4]= 9,10
Now we sum all the second elements of a pair. So 2+4+6+8+10=30