Find the Sum of Last N nodes of the Linked List
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  Difficulty: Basic   Marks: 1

Given a single linked list of size M, your task is to complete the function sumOfLastN_Nodes(), which should return the sum of last N nodes of the linked list.

Input:
The function takes two arguments as input, the reference pointer to the head of the linked list and the an integer N.
There will be T test cases and for each test case the function will be called seperately.

Output:
For each test case output the sum of last N nodes of the linked list.

Constraints:
1<=T<=100
1<=N<=M<=1000

Example:
Input:

2
6 3
5 9 6 3 4 10
2 2
1 2

Output:
17
3

Explanation:
Testcase 1:
Sum of last three nodes in the linked list is 3 + 4 + 10 = 17.

 

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

Author: harshitsidhwa


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