HackerRank - Cracking the Code Interview - Arrays: Left Rotation (https://www.hackerrank.com/challenges/ctci-array-left-rotation)

Solution.java

import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

public class Solution {

    public static int[] arrayLeftRotation(int[] a, int n, int k) {
        if (k < 0) throw new RuntimeException("K needs to be greater than zero");
        if (k == 0) return a;
        
        int initial = k;
        
        int[] results = new int[a.length];
            
        for (int i = 0; i < a.length; i++) {
            int position = i + k;
            if (position > (a.length - 1)) position = position - a.length;
            
            results[i] = a[position];
        }
        
        return results;
    }
    
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        int k = in.nextInt();
        int a[] = new int[n];
        for(int a_i=0; a_i < n; a_i++){
            a[a_i] = in.nextInt();
        }
      
        int[] output = new int[n];
        output = arrayLeftRotation(a, n, k);
        for(int i = 0; i < n; i++)
            System.out.print(output[i] + " ");
      
        System.out.println();
      
    }
}