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/* package whatever; // 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 Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		// your code goes here
		//readNumbers();
	}
 
	public static int[] readNumbers()
	{
		int[] a = new int[n.length];
		Scanner scan = new Scanner(System.in);
		for(int i = 0;i<n.length;i++) {
    		//String token = scan.next();
    		a[i] = scan.nextInt();
		}
		return a;
	}
}

Main.java:18: error: cannot find symbol
		int[] a = new int[n.length];
		                  ^
  symbol:   variable n
  location: class Ideone
Main.java:20: error: cannot find symbol
		for(int i = 0;i<n.length;i++) {
		                ^
  symbol:   variable n
  location: class Ideone
2 errors

Standard output is empty