Exception in thread "main" java.lang.NumberFormatException: For input string: "1 ". Number format exception for "1". Although using trim() and split() [closed]

You are given an array A of N numbers, output the count of pairs in the array whose sum is divisible by 4.

The first line of the input contains a single integer T denoting the number of test cases.

The description of T test cases follows.

The first line of each test case contains a single integer N.

The second line contains N space-separated integers

A[0] A[1] ... A[N−1]

representing the array numbers.

/* 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. */
public class Main {
    public static void main (String[] args) throws java.lang.Exception {
        //Scanner scan = new Scanner(System.in);
        BufferedReader br= new BufferedReader(new InputStreamReader(System.in));
        int t = Integer.parseInt(br.readLine());
        //int t= scan.nextInt();
        while (t-- > 0) {
            int n = Integer.parseInt(br.readLine());
            long ans=0;
            int[] arr= new int[n];
            String line = br.readLine();
            String[] strs = line.trim().split("\\s+");
            for (int i = 0; i < n; i++) {
                arr[i]=Integer.parseInt(strs[i]);
            }
            int[] count = new int[4];
            for (int i = 0; i < n; i++) {
                count[arr[i] % 4]++;
            }
            for (int i = 1; i <= 1; i++) {
                ans += count[i] * count[4-i];
            }
            ans += (count[2] * (count[2]-1)) / 2;
            //System.out.println(ans);
            ans += (count[0] * (count[0]-1)) / 2;
            System.out.println(ans);                    
        }
    }
}