-> Given an array of size N ; find the maximum sum subarray which has a difference of "k" between the start and end elements of the array
N = 8
K = 5
1 5 -5 8 8 8 10 15
Output - [5 -5 8 8 8 10] = 34. (also difference b/w start and end element is abs(5-10) = 5
1 <= K <= 100000
1 <= N <= 100000
If there is no subarray with positive then print 0