How to Fix Selection Sort Errors

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

Fix selection sort errors when inner loop starts from wrong index or swap happens after each comparison.

Quick Fix

Wrong

def sel(a):
    for i in range(len(a)):
        m=i
        for j in range(len(a)):
            if a[j]<a[m]: m=j
        a[i],a[m]=a[m],a[i]

Inner loop scans entire array instead of unsorted portion. Re-sorts already sorted part.

Right

def sel(a):
    n=len(a)
    for i in range(n):
        m=i
        for j in range(i+1,n):
            if a[j]<a[m]: m=j
        a[i],a[m]=a[m],a[i]
    return a

[64,25,12,22,11] -> [11,12,22,25,64]. O(n^2).

Prevention

Inner loop starts from i+1 (unsorted portion). One swap per outer iteration.

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