MissingNumbers.java

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

public class MissingNumbers {
//	https://www.hackerrank.com/challenges/missing-numbers/problem
    // Complete the missingNumbers function below.
    static Object[] missingNumbers(int[] arr, int[] brr) {
        Arrays.sort(brr);
        Arrays.sort(arr);
        for(int i = 0; i<arr.length;i++) {
            for(int x = i;x<brr.length;x++) {
                if(arr[i] == brr[x]) {
                    brr[x] = 0;
                    break;
                }
            }
        }
 
        List<Integer> list = new ArrayList<>();
        for (Integer i : brr) {
            if(i!=0 && !list.contains(i))
                list.add(i);
        }
        
        return list.toArray();
        
    }

    private static final Scanner scanner = new Scanner(System.in);

    public static void main(String[] args) throws IOException {
        BufferedWriter bufferedWriter = new BufferedWriter(new FileWriter(System.getenv("OUTPUT_PATH")));

        int n = scanner.nextInt();
        scanner.skip("(\r\n|[\n\r\u2028\u2029\u0085])?");

        int[] arr = new int[n];

        String[] arrItems = scanner.nextLine().split(" ");
        scanner.skip("(\r\n|[\n\r\u2028\u2029\u0085])?");

        for (int i = 0; i < n; i++) {
            int arrItem = Integer.parseInt(arrItems[i]);
            arr[i] = arrItem;
        }

        int m = scanner.nextInt();
        scanner.skip("(\r\n|[\n\r\u2028\u2029\u0085])?");

        int[] brr = new int[m];

        String[] brrItems = scanner.nextLine().split(" ");
        scanner.skip("(\r\n|[\n\r\u2028\u2029\u0085])?");

        for (int i = 0; i < m; i++) {
            int brrItem = Integer.parseInt(brrItems[i]);
            brr[i] = brrItem;
        }

        Object[] result = missingNumbers(arr, brr);

        for (int i = 0; i < result.length; i++) {
            bufferedWriter.write(String.valueOf((Integer)result[i]));

            if (i != result.length - 1) {
                bufferedWriter.write(" ");
            }
        }

        bufferedWriter.newLine();

        bufferedWriter.close();

        scanner.close();
    }
}