2d Array in Spiral Order

Question

I\'m trying to fill an array in spiral order. So far, I can print the array in spiral order, but is there a way to modify the array so that i can fill it in spiral order and

Answer 1

public ArrayList spiralOrder(final List> a) {
     ArrayList result = new ArrayList();
      int m = a.get(0).size();
      int n = a.size();
      if(m>1 && n>1){
         int loopCounter = (n > m)  ? m*2 : n *2 -1 ;
         int opr=1;
         int i=0,j=0;
         int opA=m,opB=n,opC=0,opD=1;
         for(int k=0;k < loopCounter ;k++){
              if(opr == 1){
                 int counter =0;
                 while(counter < opA){
                    System.out.print(a.get(i).get(j)+ ";");
                    result.add(a.get(i).get(j));
                    counter++;

                    if(j != opA-1){
                        j++;
                    }
                    else{
                        break;
                    }
                 }
                 opr =2;
                 continue;
             }
             if(opr == 2){
                 i++;
                 int counter =1;
                 while(counter < opB){
                     System.out.print(a.get(i).get(j)+ ";");
                    result.add(a.get(i).get(j));
                    counter++;

                   if( i != opB-1){
                     i++;
                   }
                   else{
                       break;
                   }
                 }
                 opr =3;
                 continue;
             }
             if(opr == 3){
                 j--;
                 int counter =j;
                 while(counter >= opC){
                     System.out.print(a.get(i).get(j)+ ";");
                    result.add(a.get(i).get(j));
                    counter --;
                     if(j != opC){
                     j--;
                    }
                    else{
                        break;
                    }
                  }
                 opr =4;
                 continue;
             }
             if(opr == 4){
                 i--;
                 int counter = i;
                 while(counter >= opD){
                     System.out.print(a.get(i).get(j)+ ";");
                    result.add(a.get(i).get(j));
                    counter --;
                    if(i != opD){
                     i--;
                    }else{
                        break;
                    }
                 }
                 opr =1;
                 j++;
                 opA = opA -1;
                 opB = opB -1;
                 opC= opC +1;
                 opD = opD+1;
                 continue;
             }
         }

     }

         else if(n ==1){
              for(int k=0;k < a.get(0).size();k++){
                  result.add(a.get(0).get(k));
              }
         }

       else if(m==1 && n==1){
             result.add(a.get(0).get(0));
         }

     // Populate result;
     return result;

}