ArraysLeftrotation.java

import java.util.*;
import java.util.Scanner;

/* left rotation: rotation time t=2

before rotation: a=[1,2,3,4,5]

after rotation: a'=[3,4,5,1,2]
 */
public class ArraysLeftrotation {
    public static void main(String[] args) {
        Scanner s = new Scanner(System.in);
        int size;
        int i, RotateTime;
        System.out.print("Enter the size of the array:");
        size = s.nextInt();
        int a[] = new int[size]; // original array:
        int RotateArray[] = new int[size]; // Rotatearray

        System.out.print("\nEnter the array elements:");
        for (i = 0; i < size; i++) {
            a[i] = s.nextInt();
        }
        System.out.print("\nThe array element are:");
        for (i = 0; i < size; i++) {
            System.out.print(a[i] + " ");
        }

        System.out.print("\nEnter the number of Left Rotation:");
        RotateTime = s.nextInt();
        // rotation logic:
        for (i = 0; i < size; i++) {
            int position = (i + size - RotateTime) % size;
            // assigning rotate arrays:
            RotateArray[position] = a[i];
        }
        System.out.print("Array after " + RotateTime + " left rotation: " + Arrays.toString(RotateArray));
    }
}