algorithms/algorithms/sort/shell_sort.py at master · lualgorithm/algorithms · GitHub

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def shell_sort(arr):

''' Shell Sort

Complexity: O(n^2)

'''

n = len(arr)

# Initialize size of the gap

gap = n//2

while gap > 0:

y_index = gap

while y_index < len(arr):

y = arr[y_index]

x_index = y_index - gap

while x_index >= 0 and y < arr[x_index]:

arr[x_index + gap] = arr[x_index]

x_index = x_index - gap

arr[x_index + gap] = y

y_index = y_index + 1

gap = gap//2

return arr

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