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It's just because in the '(rot-1)th' elements of the array you will have negative indexes, causing errors or, even, segmentation error (as in test case 4). So, doing this, you add N to negative indexes to retrive the correct values from the former array, without rotating it at all.
Circular Array Rotation
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Can you guys explain to me this line
I don't understand why it can refer to the roation element of array?
It's just because in the '(rot-1)th' elements of the array you will have negative indexes, causing errors or, even, segmentation error (as in test case 4). So, doing this, you add N to negative indexes to retrive the correct values from the former array, without rotating it at all.