Todays Challange :

 Solved Challange :


Java Code :

 
  import java.util.*;
  class Temp
  {
    static void add(String[] ans , String str, int index) 
    {
      ans[index] = str;
    }
    static Scanner input = new Scanner(System.in);
    public static void main(String[] args) {
      try
      {
        int n = input.nextInt();
        String[] ans = new String[n];
        String s = "";
        int first = 0;
        int last = n-1;
        int flag = 0;

        for(int i=1;i<= n*n;i++) {
          if(i%n==0){
              s += "" +i;
              if(flag == 0) {
                  flag = 1;
                  add(ans,s,first++);
              }
              else{
                  flag = 0;
                  add(ans,s,last--);
              }	
              s = "";
              continue;
          }
          s+= "" + i + "*";
        }

        for(String sss:ans)  
          System.out.println(sss);

      }
      catch(Exception e){
        return;
      }
    }
  }

Output :

  3
  1*2*3
  7*8*9
  4*5*6
  4
  1*2*3*4
  9*10*11*12
  13*14*15*16
  5*6*7*8
  5
  1*2*3*4*5
  11*12*13*14*15
  21*22*23*24*25
  16*17*18*19*20
  6*7*8*9*10

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