boilerpate.java

import java.util.*;

class Solution {  

  static void doStuff(int[] ar){

  }
 
 static void printArray(int[] ar) {
    for(int n: ar){
      System.out.print(n+" ");
      }
      System.out.println("");
    }
       
  public static void main(String[] args) {
      Scanner in = new Scanner(System.in);

      int t = in.nextInt();
      for(int c=0;c<t;c++){
        int n = in.nextInt();
        int[] ar = new int[n];
        for(int i=0;i<n;i++){
          ar[i]=in.nextInt(); 
        }
        doStuff(ar);
       }    
     }     
   }