Help me in solving RAIN8TEST problem

help
,
1

My issue

Code gets correct output but while submitting I am getting wrong

My code

/* package codechef; // don't place package name! */

import java.util.*;
import java.lang.*; 
import java.io.*;

/* Name of the class has to be "Main" only if the class is public. */
class Codechef
{
	public static void main (String[] args) throws java.lang.Exception
	{
		// your code goes here
		Scanner sc=new Scanner(System.in);
		int sum=0;
		int t=sc.nextInt();
		for(int i=1;i<=t;i++)
		{
		  int A=sc.nextInt();
		  int B=sc.nextInt();
		  int a[]=new int[A];
		  a[0]=0;
		  for(int k=0;k<A;k++)
		  {
		    a[k]=sc.nextInt();
		  }
		  for(int j=0;j<A;j++)
		  {
		    if(j>=1)
		    {
		    if(a[j]==1 || a[j-1]==1)
		    {
		      sum=sum+B;
		    }
		    }
		    else if(j==0)
		    {
		      if(a[j]==1)
		      {
		        sum=sum+B;
		      }
		    }
		  }
		  System.out.println(sum);
}
}
}

Problem Link: CodeChef: Practical coding for everyone

2

@reddytanuj7
Use long instead of int to avoid integer overflow.