How to Left Rotate an Array

In this example, we’ll see how to left rotate an array:

Input:
int rotateBySteps = 2;
int[] arr1 = { 2, 5, 7, 8, 14 };

Output:
[7, 8, 14, 2, 5]

First Rotation: [5, 7, 8, 14, 2]
Second Rotation: [7, 8, 14, 2, 5]

1. Java

public class LeftRotateArray {
	
	static int[] rotLeft(int[] arr, int noOfSteps) {
		for (int i = 0; i < noOfSteps; i++) {
			int first = arr[0];
			for (int j = 0; j <= arr.length - 2; j++) {
				arr[j] = arr[j + 1];
			}
			arr[arr.length - 1] = first;
		}
		return arr;
	}

	public static void main(String[] args) throws IOException {

		int noOfSteps = 2;

		int[] arr = {1, 2, 3, 4, 5};

		int[] result = rotLeft(arr, noOfSteps);

		System.out.println(Arrays.toString(result));
	}
}

Output:

[3, 4, 5, 1, 2]

Complete Java Solutions can be found here: Github Link

The complete list can be found here: Practise Programming Questions