SDE - 1

You are given an array/list ‘arr’ of size ‘N’. Find the maximum sum of the elements of the array you can obtain after flipping the sign of exactly ‘K’ elements

For example :

Let arr = [-2, 0, 5, -1, 2]
and K = 4

We will output 10 as we replace -2 by 2, -1 by 1, 0 by 0, and 0 by 0.

Note :

We can apply the flip operation to the same element multiple times

You are given an integer array 'ARR' of size 'N' and an integer 'S'. Your task is to return the list of all pairs of elements such that each sum of elements of each pair equals 'S'.

Note:

Each pair should be sorted i.e the first value should be less than or equals to the second value. 

Return the list of pairs sorted in non-decreasing order of their first value. In case if two pairs have the same first value, the pair with a smaller second value should come first.

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