How to Fix Insertion Sort Errors

In this tutorial, you'll learn about How to Fix Insertion Sort Errors. We cover key concepts, practical examples, and best practices.

Fix insertion sort errors when shifting uses swap instead of assignment or boundary conditions wrong.

Quick Fix

Wrong

def ins(a):
    for i in range(1,len(a)):
        for j in range(i,0,-1):
            if a[j]<a[j-1]: a[j],a[j-1]=a[j-1],a[j]

Using swap instead of shifting. Triple the assignments needed.

Right

def ins(a):
    for i in range(1,len(a)):
        key=a[i]; j=i-1
        while j>=0 and a[j]>key:
            a[j+1]=a[j]; j-=1
        a[j+1]=key
    return a

[12,11,13,5,6] -> [5,6,11,12,13]. O(n) best, O(n^2) average.

Prevention

Store key, shift elements right, insert key at correct position. O(n) for nearly sorted.

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