TRIANGLE OF O 1

/* Display Triangle as follow
   0
   1 0
   1 0 1
   0 1 0 1 */
class Output2{
 public static void main(String args[]){
  for(int i=1;i<=4;i++){
   for(int j=1;j<=i;j++){
    System.out.print(((i+j)%2)+" ");
   }
   System.out.print("\n");
  }
 }
}