안녕하세요 강사님 . 제 답은 왜 오답일까요?

import java.util.*;

public class Main {
    public static void main(String[] args) {
        Main main = new Main();
        Scanner in = new Scanner(System.in);

        int n;
        int[][] arr;

        n = in.nextInt();
        arr = new int[n][2];
        for(int i=0; i<n; i++) {
            for(int j=0; j<2; j++) {
                arr[i][j] = in.nextInt();
            }
        }

        int[][] result = main.solution(n, arr);

        for(int i=0; i<n; i++) {
            for (int j = 0; j < 2; j++) {
                System.out.print(result[i][j]+" ");
            }
            System.out.println();
        }
    }

    int[][] solution(int n, int[][] arr) {
        int[][] result = new int[n][2];

        int[] sortedX = new int[n];
        for(int i=0; i< n; i++) {
            sortedX[i] = arr[i][0];
        }

        int[] sortedY = new int[n];
        for(int i=0; i< n; i++) {
            sortedY[i] = arr[i][1];
        }

        Arrays.sort(sortedX);
        Arrays.sort(sortedY);

        for(int i=0; i<n; i++) {
            result[i][0] = sortedX[i];
            result[i][1] = sortedY[i];
        }

        return result;
    }
}