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Yes. Which means, in effect, that no rotation should be performed upon the array, because rotating each element by k will have each of them end up right back where they started. Using 0 for k will have that effect.
Circular Array Rotation
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if k is a multiple of n then won't the remainder be 0?
Yes. Which means, in effect, that no rotation should be performed upon the array, because rotating each element by k will have each of them end up right back where they started. Using 0 for k will have that effect.