Left Rotation Array HackerRank Problem

 A left rotation operation on an array of size  shifts each of the array's elements  unit to the left. Given an integer, , rotate the array that many steps left and return the result.

Example

After  rotations, .

Function Description

Complete the rotateLeft function in the editor below.

rotateLeft has the following parameters:

int d: the amount to rotate by

int arr[n]: the array to rotate

Returns

int[n]: the rotated array

Input Format

The first line contains two space-separated integers that denote , the number of integers, and , the number of left rotations to perform.

The second line contains  space-separated integers that describe .

import java.io.*;

import java.math.*;

import java.security.*;

import java.text.*;

import java.util.*;

import java.util.concurrent.*;

import java.util.function.*;

import java.util.regex.*;

import java.util.stream.*;

import static java.util.stream.Collectors.joining;

import static java.util.stream.Collectors.toList;

class Result {

    /*

     * Complete the 'rotateLeft' function below.

     *

     * The function is expected to return an INTEGER_ARRAY.

     * The function accepts following parameters:

     *  1. INTEGER d

     *  2. INTEGER_ARRAY arr

     */

    public static List<Integer> rotateLeft(int d, List<Integer> arr) {

    // Write your code here

   int n = arr.size();

        d = d % n;

       ArrayList<Integer> temp=new ArrayList<>();

        // Copy rotated elements

        for (int i = 0; i < n; i++) {

            temp.add(arr.get((i + d) % n));

        }

return temp;

    }

}

public class Solution {

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

        BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in));

        BufferedWriter bufferedWriter = new BufferedWriter(new FileWriter(System.getenv("OUTPUT_PATH")));

        String[] firstMultipleInput = bufferedReader.readLine().replaceAll("\\s+$", "").split(" ");

        int n = Integer.parseInt(firstMultipleInput[0]);

        int d = Integer.parseInt(firstMultipleInput[1]);

        List<Integer> arr = Stream.of(bufferedReader.readLine().replaceAll("\\s+$", "").split(" "))

            .map(Integer::parseInt)

            .collect(toList());

        List<Integer> result = Result.rotateLeft(d, arr);

        bufferedWriter.write(

            result.stream()

                .map(Object::toString)

                .collect(joining(" "))

            + "\n"

        );

        bufferedReader.close();

        bufferedWriter.close();

    }

}