//Java solution
 public static List<Integer> countingSort(List<Integer> arr) {
    // Write your code here
     Integer countArr[] = new Integer[100];
     Arrays.fill(countArr, 0);
     for(int i=0;i<arr.size();i++){
         countArr[arr.get(i)]++;         
     }  
      return Arrays.asList(countArr);  
    }