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Because when the number of rotations(k) equals the size of the array(n), the array returns to it's original setup. For example, after 3 rotations, this array is back to original:
[1,2,3]0original[3,1,2]1rotation[2,3,1]2rotations[1,2,3]3rotations//Back to original setup[3,1,2]4rotations// same as 1 rotation
Therefore if you have 4 rotations, then 4 % 3 is 1, so you will get the same result as if you only had 1 rotation to begin with.
Circular Array Rotation
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Because when the number of rotations(k) equals the size of the array(n), the array returns to it's original setup. For example, after 3 rotations, this array is back to original:
Therefore if you have 4 rotations, then 4 % 3 is 1, so you will get the same result as if you only had 1 rotation to begin with.