Fast input output in java its amazing zing zing

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

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

class Main {
   
   static List<Integer>[] edges;
   static boolean[] vis;
   static List<Integer> path;
   
 public static void main (String[] args) throws java.lang.Exception
 {
  // your code goes here
    FastScanner in=new FastScanner();
    PrintWriter out=new PrintWriter(System.out);
        
       int t = in.nextInt();
      while(t-->0)
      {
         int num = in.nextInt();
          int[] arr1 = new int[num];
          int[] arr2 = new int[num];
          int[] w = new int[num];
          
          for(int i=0; i<num; i++){
              arr1[i] = in.nextInt();
          }
          for(int i=0; i<num; i++){
              arr2[i] = in.nextInt();
              w[i] = arr1[i]*arr2[i];
          }
          int max=w[0],index=0;
          for(int i=1;i<num;i++)
          {
              if(w[i]>max)
              {
                  max=w[i];
                  index=i;
              }
              if(w[i]==max && arr2[i]>arr2[index])
              {
                  index=i;
              }
          }
          out.println(index+1);
         }     
          out.close();
        }
   
 static long gcd(long a, long b)
 {
 if(b==0)
 return a;
 else
 return gcd(b, a%b);
 }
 
   
   static class FastScanner {
      BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
      StringTokenizer st=new StringTokenizer("");
      String next() {
         while (!st.hasMoreTokens())
            try {
               st=new StringTokenizer(br.readLine());
            } catch (IOException e) {
               e.printStackTrace();
            }
         return st.nextToken();
      }
      
      int nextInt() {
         return Integer.parseInt(next());
      }
      int[] readArray(int n) {
         int[] a=new int[n];
         for (int i=0; i<n; i++) a[i]=nextInt();
         return a;
      }
      long nextLong() {
         return Long.parseLong(next());
      }
   }
}