/* 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
	{
/*       int[] array = new int[100];
 
 for (int i = array.length / 2, j = array.length - 1; 
          i >= 0 && j >= array.length / 2; 
          i--, j--)
      System.out.println(i + ":" + j + " = " + (array[j] - array[i]));*/
 
      int[] array = new int[100];
      int raznost;
 
      for (int i = 0, j = array.length - 1; i <= j; i++, j--)
 
 
           System.out.println(i + ":" + j + " = " + (i - j));
	}
 
 
}

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