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def rotate_array(arr, n)
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reverse(reverse(arr[0...n]) + reverse(arr[n..arr.length - 1]))
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end
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def reverse(arr)
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i = 0
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j = arr.length - 1
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while i < j
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temp = arr[i]
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arr[i] = arr[j]
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arr[j] = temp
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i += 1
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j -= 1
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end
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arr
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end
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