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NZEC runtime error in Java

This is my code. Please check it where it is giving runtime exception. I wrote a piece of code to solve this problem.

I keep getting NZEC(runtime error), but I can't find which part of the code can cause any Exception since it only involves simple arithmetic computation (there should be no chance of divided by zero).

The logic of the code doesn't matter, and I just wonder where the exception could be hiding.

Any one can spot any bug? Thanks.

import java.io.BufferedReader;
import java.io.File; // headers
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStreamReader;
import java.math.BigInteger;
import java.util.Arrays;
import java.util.Scanner;
import java.util.Vector;
import java.math.BigInteger;

public class Mkequal // class
    public static void main(String[] args) throws IOException // main class
        BufferedReader br = new BufferedReader(new InputStreamReader(System. in));
        Scanner sc = new Scanner(System. in );
        int t = Integer.parseInt(br.readLine());
        while (t-- > 0) // while loop
            int sum = 0;
            int n = Integer.parseInt(br.readLine()); //number of elements in array
            int arr[] = new int[n];
            for (int i = 0; i < n; i++)
                arr[i] = sc.nextInt();
            for (int i = 0; i < n; i++)
                sum += arr[i];
            if (sum % n == 0) //if divisible by n,print n
                System.out.println(n - 1);

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You are most probably creating too many memory in program. you must create array(arr) outside the while loop and manipulate it inside the loop..

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