Sum of subset differences
Submissions: 506   Accuracy:

43.88%

  Difficulty: Easy   Marks: 2

Given an array S consisting of n numbers, find the sum of difference between last and first element of each subset.
For example for set 5,8 there are 3 subsets possible
5    (difference is 5-5 = 0 as 5 is the only last and first element)
8    (difference is 8-8 = 0 as 8 is the only last and first element)
5 8 (difference is 8-5 = 3 as 8 is the last element  and 5 is the first element)
thus difference sum is 0+0+3 = 3
You are required to complete the function which returns an integer denoting the sum of difference between last and first element for each subset of array S.

Note: Elements in the subset should be in the same order as in the set S.

Input:
The first line of input contains an integer T denoting the no of test cases. Then T test cases follow. Each test case contains 2 lines the first line of input contains an integer N denoting the size of the array A. In the next line are N space separated values of the array A.

Output:
For each test case in a new line output will be the sum of difference between last and first element of each subset of array S.

Constraints:
1<=T<=100
1<=N<=20
1<=A[]<=1000

Example(To be used only for expected output) :
Input:

2
4
5 2 9 6
3
1 2 3 
Output
21
6

Note:The Input/Ouput format and Example given are used for system's internal purpose, and should be used by a user for Expected Output only. As it is a function problem, hence a user should not read any input from stdin/console. The task is to complete the function specified, and not to write the full code.

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

Contributor: Amit Khandelwal, Harshit Sidhwa
Author: Shubham Joshi 1


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.