def test_invalid_range(self):
input, expected, start, end = [1, 2, 3, 4, 5, 6], [1, 2, 3, 4, 5, 6], 0, 10
result = reverse_by_index(input, start, end)
self.assertEqual(expected, result)
input, expected, start, end = [1, 2, 3, 4, 5, 6], [1, 2, 3, 4, 5, 6], -2, 2
result = reverse_by_index(input, start, end)
self.assertEqual(expected, result)
input, expected, start, end = [1, 2, 3, 4, 5, 6], [1, 2, 3, 4, 5, 6], 5, 0
result = reverse_by_index(input, start, end)
self.assertEqual(expected, result)
def rotate_using_reversing_array(elements, rotate_by):
if not valid_inputs(elements, rotate_by):
return elements
size = len(elements)
rotate_by = rotate_by % size
reverse_by_index(elements, 0, rotate_by - 1)
reverse_by_index(elements, rotate_by, size - 1)
reverse_by_index(elements, 0, size - 1)
return elements
def right_rotation_using_reverse(elements, rotate_by):
if not valid_inputs(elements, rotate_by):
return elements
size = len(elements)
rotate_by = rotate_by % size
reverse_by_index(elements, 0, size - rotate_by - 1)
reverse_by_index(elements, size - rotate_by, size - 1)
reverse_by_index(elements, 0, size - 1)
print(elements)
return elements
def test_zero_range(self):
input, expected, start, end = [1, 2, 3, 4, 5, 6], [1, 2, 3, 4, 5, 6], 0, 0
result = reverse_by_index(input, start, end)
self.assertEqual(expected, result)
def test_valid_range(self):
input, expected, start, end = [1, 2, 3, 4, 5, 6], [4,3,2,1,5,6], 0, 3
result = reverse_by_index(input, start, end)
self.assertEqual(expected, result)