class Solution {
    public boolean isNStraightHand(int[] hand, int W) {
        if (hand.length % W != 0) return false;

        ArrayList<Integer> list = new ArrayList<>();
        for(int i : hand) list.add(i);
        Collections.sort(list);

        while(list.size() != 0) {
            ArrayList<Integer> temp = new ArrayList<>();
            int skipper = 0;
            int tempIdx = 0;

            temp.add(list.remove(0));

            while(temp.size() != W) {

                while(list.get(skipper) == temp.get(tempIdx)){
                    if (skipper >= list.size() - 1) return false;
                    skipper++;
                }

                if (list.get(skipper) != temp.get(tempIdx) + 1) return false;
                else {
                    temp.add(list.remove(skipper));
                    tempIdx++;
                }
            }
        }

        return list.isEmpty();
    }
}