Circular rotation by K positions
Detailed guide and Python implementation for the 'Circular rotation by K positions' problem.
Problem Statement
Write a function circular_rotate(arr, k) that performs a circular right rotation of the array arr by k positions and returns the result. Elements shifted past the end wrap around to the beginning. For example, rotating [1,2,3,4,5] right by 2 gives [4,5,1,2,3].
- •0 <= len(arr) <= 10^5
- •0 <= k <= 10^6
- •-10^9 <= arr[i] <= 10^9
Examples
arr = [1, 2, 3, 4, 5], k = 2
[4, 5, 1, 2, 3]
Right rotate by 2: last 2 elements [4,5] move to the front.
arr = [10, 20, 30, 40], k = 1
[40, 10, 20, 30]
Right rotate by 1: 40 moves to the front.
arr = [1, 2, 3], k = 6
[1, 2, 3]
k=6 is a multiple of 3 (array length), so the array returns to its original position.
Need a Hint?
Edge Cases to Watch
- Empty input structures
- Single element inputs
- Large numerical bounds
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