Flyod's Algorithm

1 
23 
456 

78910 
====================

  
  public static void main(String[] args) {
    int n=10,k=1;
    for(int i=1;i<=n;i++){
      for(int j=2;j<=i;j++){
        System.out.print(k);
        k++;
      }
      System.out.println(" ");
    }
  }