// Mitteregulaarse kahemõõtmelise massiivi kasutamine
class TwoDAgain {
  public static void main(String args[]){
	int twoD[][] = new int[4][];
	twoD[0] = new int[1];
	twoD[1] = new int[2];
	twoD[2] = new int[3];
	twoD[3] = new int[4];
	
	int i, j, k = 0;
	
	for (i = 0; i < 4; i++)
	  for (j = 0; j < i+1; j++) {
		twoD[i][j] = k;
		k++;
		} 

	 for (i = 0; i < 4; i++){
           for (j = 0; j < i+1; j++) 
		System.out.print(twoD[i][j] + " ");
		System.out.println();  //  reavahetus
		}
	}
}