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Python Program for Stooge Sort

  • Last Updated : 30 Dec, 2020

The Stooge sort is a recursive sorting algorithm. It is defined as below (for ascending order sorting).

Step 1 : If value at index 0 is greater than
         value at last index, swap them.
Step 2:  Recursively,
       a) Stooge sort the initial 2/3rd of the array.
       b) Stooge sort the last 2/3rd of the array.
       c) Stooge sort the initial 2/3rd again to confirm.

Python3




# Python program to implement stooge sort
  
def stoogesort(arr, l, h):
    if l >= h:
        return
   
    # If first element is smaller
    # than last,swap them
    if arr[l]>arr[h]:
        t = arr[l]
        arr[l] = arr[h]
        arr[h] = t
   
    # If there are more than 2 elements in
    # the array
    if h-l+1 > 2:
        t = (int)((h-l+1)/3)
   
        # Recursively sort first 2/3 elements
        stoogesort(arr, l, (h-t))
   
        # Recursively sort last 2/3 elements
        stoogesort(arr, l+t, (h))
   
        # Recursively sort first 2/3 elements
        # again to confirm
        stoogesort(arr, l, (h-t))
   
  
# deriver 
arr = [2, 4, 5, 3, 1]
n = len(arr)
  
stoogesort(arr, 0, n-1)
   
for i in range(0, n):
    print(arr[i], end = \' \')
  
# Code Contributed by Mohit Gupta_OMG <(0_o)>

Output:

1 2 3 4 5 

Please refer complete article on Stooge Sort for more details!

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