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Alternate Color Swapping Solution

You have an array of integers that represents a sequence of alternating light blue and white squares on a wall...

Example 1

{"arr":[1,2,3,4,5],"k":2}

[3,0,5,2,7]

Example 2

{"arr":[-1,0,1],"k":1}

[0,-1,2]

The input array will have an even number of elements.
The input array will always start and end with a light blue square (represented by 1).