Help me in solving AOJ20 problem

help
,
1

My issue

I am getting right output but its showing answer. I don’t what to do. Please help me out with this

My code

import java.util.*;

class Codechef
{
	public static void main (String[] args)
	{
		Scanner read = new Scanner(System.in);
		int t = read.nextInt();
		for(int i=0; i<t; i++)
		{
		    ArrayList<Integer> a = new ArrayList<Integer>();
		    ArrayList<Integer> b = new ArrayList<Integer>();
		    int n = read.nextInt();
		    for(int j=1; j<=n; j++){
		        int ele = read.nextInt();
    		    a.add(ele);
		    }
		    for(int j=1; j<=n; j++){
		        int ele = read.nextInt();
    		    b.add(ele);
		    }
		    // Update the code below to solve this problem
		    int count=0;
		    int res=0;
		    for(int j=0;j<n;j++)
		    {
		        if(a.get(j)>=b.get(j))
		        {
		            count++;
		            if(j==n-1)
		              break;
		            res+=a.get(j);
		            a.set(j+1,a.get(j+1)-res);
		        }
		    }
		    System.out.println(count);
		    
		}
	}
}

Learning course: Placement preparation using Java
Problem Link: Practice Problem in - CodeChef