I am a beginner & i am facing issue

Question Link: Contest Page | CodeChef
Please Find the mistake in my solution–
My Solution-

/* 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
	{
	    
	    try{
	        Scanner input=new Scanner(System.in);
	        int t=input.nextInt();
	        
	        while(t-->0){
	       int n=input.nextInt(); 
	       
	       int a[]=new int[n];
	       int b[]=new int[n-1];
	       
	      for(int i=0;i<n;i++)
	      a[i]=input.nextInt();
	          
	      for(int i=0;i<n-1;i++)
	      b[i]=input.nextInt();
	  
	          int sum=0,arrSum=0;
	          int minValue=Integer.MAX_VALUE;
	          int totalSum=0;
	          
	         for(int i=0;i<n-1;i++)  
	          sum+=b[i];
	          
	          for(int i=0;i<n;i++)
	          totalSum+=a[i];
	          
	          
	          for(int i=0;i<n;i++){
	           arrSum=totalSum-a[i];
	            
	            int diff=sum-arrSum;
	            
	            if(diff%(n-1)==0){
	           int x=diff/(n-1);
	            if(x>0 && x<minValue)
	            minValue=x;
	                
	            }
	            
	            arrSum=0;
	         }
	       
	         System.out.println(minValue);
 }
     }catch(Exception e){
	        return;
	    }
	
	}
}