DATA STRUCTURES • ALGORITHMS

Rotate Array

Shifting elements of an array by K positions. A common technique involves reversing parts of the array to achieve rotation in-place.

Time

O(N)

Space

O(1)

Key Principle 1

Cyclic shift of elements

Key Principle 2

K = K % N to handle large K

Key Principle 3

Optimal 3-step reversal method

Key Principle 4

In-place transformation

ROTATE_ARRAY_LAB
ARRAY:
K:
Current Step
Rotating array by k=3. Using the 3-reverse optimal method.
Playback
Rotation Stats ⠿
K3
N7
STATUSInit
In-Place Logic ⠿
1k = k % n;
2reverse(arr, 0, n - 1);
3reverse(arr, 0, k - 1);
4reverse(arr, k, n - 1);
1
[0]
2
[1]
3
[2]
4
[3]
5
[4]
6
[5]
7
[6]

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