Python Program for Recursive Insertion Sort

Difficulty Level : Medium
Last Updated : 30 Dec, 2020

Insertion sort is a simple sorting algorithm that works the way we sort playing cards in our hands.
Below is an iterative algorithm for insertion sort

Algorithm

// Sort an arr[] of size n
insertionSort(arr, n) 
    Loop from i = 1 to n-1.
       a) Pick element arr[i] and insert
          it into sorted sequence arr[0..i-1]

Python

# Recursive Python program for insertion sort
# Recursive function to sort an array using insertion sort
  
def insertionSortRecursive(arr,n):
    # base case
    if n<=1:
        return
      
    # Sort first n-1 elements
    insertionSortRecursive(arr,n-1)
    \'\'\'Insert last element at its correct position
        in sorted array.\'\'\'
    last = arr[n-1]
    j = n-2
      
      # Move elements of arr[0..i-1], that are
      # greater than key, to one position ahead
      # of their current position 
    while (j>=0 and arr[j]>last):
        arr[j+1] = arr[j]
        j = j-1
  
    arr[j+1]=last
      
# A utility function to print an array of size n
def printArray(arr,n):
    for i in range(n):
        print arr[i],
  
# Driver program to test insertion sort 
arr = [12,11,13,5,6]
n = len(arr)
insertionSortRecursive(arr, n)
printArray(arr, n)
  
# Contributed by Harsh Valecha

Please refer complete article on Recursive Insertion Sort for more details!

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