Pair Sum in Vector
Submissions: 2542   Accuracy:

87.31%

  Difficulty: Easy   Marks: 2
Associated Course(s):   Fork CPP

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.

Your Task:
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

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

Author: Soul_xhacker


If you have purchased any course from GeeksforGeeks then please ask your doubt on course discussion forum. You will get quick replies from GFG Moderators there.



Need help with your code? Please use ide.geeksforgeeks.org, generate link and share the link here.


to report an issue on this page.