Missing Numbers By Minh Conal

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 Solution {

    // Complete the missingNumbers function below.
    static int[] missingNumbers(int[] arr, int[] brr) {
        int countA[] = new int[10000];
        int countB[] = new int[10000];
        Arrays.sort(arr);
        Arrays.sort(brr);
        int min = brr[0];
        int max = brr[brr.length -1];
        for(int i=0;i<arr.length;i++){
            countA[arr[i]]++;
        }
        for(int i=0;i<brr.length;i++){
            countB[brr[i]]++;
        }
        ArrayList<Integer> ansList = new ArrayList<>();
        for(int i=min;i<=max;i++){
            if(countA[i]<countB[i])
                ansList.add(i);
        }
        int[] ans = ansList.stream().mapToInt(i -> i).toArray();
        return ans;
    }

    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;
        }

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

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

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

        bufferedWriter.newLine();

        bufferedWriter.close();

        scanner.close();
    }
}