How to Fix Array Rotation Errors

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

Fix array rotation errors when k exceeds length or in-place reversal produces wrong order.

Quick Fix

Wrong

def rotate(arr,k):
    for _ in range(k): arr.insert(0,arr.pop())

O(n*k) shift operations.

Right

def rotate(arr,k):
    n=len(arr); k%=n
    arr.reverse(); arr[:k]=reversed(arr[:k]); arr[k:]=reversed(arr[k:])

[1,2,3,4,5,6,7],k=3 -> [5,6,7,1,2,3,4]. O(n).

Prevention

Normalize k with k%=n. Use three-reverse for O(n) in-place.

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