Help me in solving problem

help
,
1

My issue

Array Index Out Of Bounds Exception

My code

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

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


/* 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
	{   
	    int t,n,j;
	    
	    Scanner sc= new Scanner(System.in);
	    t=sc.nextInt();
	    n=sc.nextInt();
	    int a[]=new int[n];
	    
	    ArrayList<Integer> b=new ArrayList<>();
	    for(int i=0;i<t;i++)
	    {
	        for( j=0;j<n;j++)
	        {
	            a[j]=sc.nextInt();
	            
	        }
	     String v=sc.next();
	     int arr[]=new int[v.length()];
	     for(int k=0;k<v.length();k++)
	     {
	        arr[k]=Character.getNumericValue(v.charAt(k));
	     }
	     for(int m=0;m <n;m++)
	     {
	         if(arr[m]==0)
	          b.add(a[m]);
	     }
	     Collections.sort(b);
	     System.out.println(b.get(0));
	    }
	}
}

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