[SWEA] 1966번 숫자를 정렬하자

import java.util.Arrays;
import java.util.Scanner;


public class Solution {
	
	public static void main(String[] args){
		
		Scanner kb = new Scanner(System.in);
		StringBuilder sb = new StringBuilder();
		
		int T = kb.nextInt();
		
		for(int i=0; i<T; i++) {
			int n = kb.nextInt();
			int[] arr = new int[n];
			
			for(int j=0; j<n; j++) {
				arr[j] = kb.nextInt();
			}
			
			Arrays.sort(arr);
			sb.append("#").append(i+1).append(" ");
			
			for(int x: arr) {
				sb.append(x).append(" ");
			}
			
			sb.append('\n');
		}
		
		System.out.println(sb.toString());
		
	}

}