Perfect Sum Problem .txt

import java.util.*;
import java.lang.*;
import java.io.*;
class GFG
 {
	 public static void main (String[] args) throws IOException
	 {
	 BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
	 StringBuffer sb=new StringBuffer();
	 int T=Integer.parseInt(br.readLine());
	 while(T-->0)
	 {
	     int n=Integer.parseInt(br.readLine());
	     String[] s=br.readLine().split("\\s");
	     int sum=Integer.parseInt(br.readLine());
	     int[] arr=new int[n];
	     for(int i=0;i<n;i++)
	     {
	         arr[i]=Integer.parseInt(s[i]);
	     }
	     int[][] dp=new int[arr.length+1][sum+1];
	    
	     sb.append(perfectsum(arr,0,sum,dp)+"\n");
	 }
	 System.out.print(sb);
	 }
	 public static int perfectsum(int[] arr,int i,int sum,int[][] dp)
	 {
	     
	     if(sum==0)
	     {
	         return 1;
	     }
	     if(i==arr.length)
	     {
	         return 0;
	     }
	     if(dp[i][sum]!=0)
	     {
	         return dp[i][sum];
	     }
	     int smallans1=0,smallans2=0;
	     if(sum-arr[i]>=0)
	     {
	     smallans1=perfectsum(arr,i+1,sum-arr[i],dp);
	     }   
	     smallans2=perfectsum(arr,i+1,sum,dp);
	     return dp[i][sum]=smallans1+smallans2;
	 }
}